From ccf1b8789e26a442558ab44bd8f41a1793c6bd80 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Wed, 20 May 2026 21:23:06 +0000
Subject: [PATCH 1/2] Update @github/copilot to 1.0.51-3

- Updated nodejs and test harness dependencies
- Re-ran code generators
- Formatted generated code
---
 dotnet/src/Generated/Rpc.cs                | 304 +++++++++------
 dotnet/src/Generated/SessionEvents.cs      | 178 +++++----
 go/rpc/zrpc.go                             | 409 ++++++++++++++-----
 go/rpc/zrpc_encoding.go                    |  17 +
 go/rpc/zsession_events.go                  | 118 ++++--
 nodejs/package-lock.json                   |  72 ++--
 nodejs/package.json                        |   2 +-
 nodejs/samples/package-lock.json           |   2 +-
 nodejs/src/generated/rpc.ts                | 434 ++++++++++++++++++---
 nodejs/src/generated/session-events.ts     | 217 +++++++++--
 python/copilot/generated/rpc.py            | 106 ++++-
 python/copilot/generated/session_events.py |  94 ++++-
 rust/src/generated/api_types.rs            | 192 +++++++++
 rust/src/generated/session_events.rs       |  81 +++-
 test/harness/package-lock.json             |  72 ++--
 test/harness/package.json                  |   2 +-
 16 files changed, 1785 insertions(+), 515 deletions(-)

diff --git a/dotnet/src/Generated/Rpc.cs b/dotnet/src/Generated/Rpc.cs
index 54ec6d48f..99ab26061 100644
--- a/dotnet/src/Generated/Rpc.cs
+++ b/dotnet/src/Generated/Rpc.cs
@@ -3918,6 +3918,7 @@ internal sealed class CommandsListRequestWithSession
 [JsonDerivedType(typeof(SlashCommandInvocationResultText), "text")]
 [JsonDerivedType(typeof(SlashCommandInvocationResultAgentPrompt), "agent-prompt")]
 [JsonDerivedType(typeof(SlashCommandInvocationResultCompleted), "completed")]
+[JsonDerivedType(typeof(SlashCommandInvocationResultSelectSubcommand), "select-subcommand")]
 public partial class SlashCommandInvocationResult
 {
     /// <summary>The type discriminator.</summary>
@@ -4000,6 +4001,48 @@ public partial class SlashCommandInvocationResultCompleted : SlashCommandInvocat
     public bool? RuntimeSettingsChanged { get; set; }
 }
 
+/// <summary>Schema for the `SlashCommandSelectSubcommandOption` type.</summary>
+public sealed class SlashCommandSelectSubcommandOption
+{
+    /// <summary>Human-readable description of the subcommand.</summary>
+    [JsonPropertyName("description")]
+    public string Description { get; set; } = string.Empty;
+
+    /// <summary>Optional group label for organizing options.</summary>
+    [JsonPropertyName("group")]
+    public string? Group { get; set; }
+
+    /// <summary>Subcommand name to invoke.</summary>
+    [JsonPropertyName("name")]
+    public string Name { get; set; } = string.Empty;
+}
+
+/// <summary>Schema for the `SlashCommandSelectSubcommandResult` type.</summary>
+/// <remarks>The <c>select-subcommand</c> variant of <see cref="SlashCommandInvocationResult"/>.</remarks>
+public partial class SlashCommandInvocationResultSelectSubcommand : SlashCommandInvocationResult
+{
+    /// <inheritdoc />
+    [JsonIgnore]
+    public override string Kind => "select-subcommand";
+
+    /// <summary>Parent command name that requires subcommand selection.</summary>
+    [JsonPropertyName("command")]
+    public required string Command { get; set; }
+
+    /// <summary>Available subcommand options for the client to present.</summary>
+    [JsonPropertyName("options")]
+    public required IList<SlashCommandSelectSubcommandOption> Options { get; set; }
+
+    /// <summary>True when the invocation mutated user runtime settings; consumers caching settings should refresh.</summary>
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    [JsonPropertyName("runtimeSettingsChanged")]
+    public bool? RuntimeSettingsChanged { get; set; }
+
+    /// <summary>Human-readable title for the selection UI.</summary>
+    [JsonPropertyName("title")]
+    public required string Title { get; set; }
+}
+
 /// <summary>Slash command name and optional raw input string to invoke.</summary>
 internal sealed class CommandsInvokeRequest
 {
@@ -6588,13 +6631,13 @@ public ModelPickerCategory(string value)
     /// <summary>Gets the value associated with this <see cref="ModelPickerCategory"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>lightweight</c> value.</summary>
+    /// <summary>Lightweight model category optimized for faster, lower-cost interactions.</summary>
     public static ModelPickerCategory Lightweight { get; } = new("lightweight");
 
-    /// <summary>Gets the <c>versatile</c> value.</summary>
+    /// <summary>Versatile model category suitable for a broad range of tasks.</summary>
     public static ModelPickerCategory Versatile { get; } = new("versatile");
 
-    /// <summary>Gets the <c>powerful</c> value.</summary>
+    /// <summary>Powerful model category optimized for complex tasks.</summary>
     public static ModelPickerCategory Powerful { get; } = new("powerful");
 
     /// <summary>Returns a value indicating whether two <see cref="ModelPickerCategory"/> instances are equivalent.</summary>
@@ -6653,16 +6696,16 @@ public ModelPickerPriceCategory(string value)
     /// <summary>Gets the value associated with this <see cref="ModelPickerPriceCategory"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>low</c> value.</summary>
+    /// <summary>Lowest relative token cost tier.</summary>
     public static ModelPickerPriceCategory Low { get; } = new("low");
 
-    /// <summary>Gets the <c>medium</c> value.</summary>
+    /// <summary>Medium relative token cost tier.</summary>
     public static ModelPickerPriceCategory Medium { get; } = new("medium");
 
-    /// <summary>Gets the <c>high</c> value.</summary>
+    /// <summary>High relative token cost tier.</summary>
     public static ModelPickerPriceCategory High { get; } = new("high");
 
-    /// <summary>Gets the <c>very_high</c> value.</summary>
+    /// <summary>Highest relative token cost tier.</summary>
     public static ModelPickerPriceCategory VeryHigh { get; } = new("very_high");
 
     /// <summary>Returns a value indicating whether two <see cref="ModelPickerPriceCategory"/> instances are equivalent.</summary>
@@ -6721,13 +6764,13 @@ public ModelPolicyState(string value)
     /// <summary>Gets the value associated with this <see cref="ModelPolicyState"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>enabled</c> value.</summary>
+    /// <summary>The model is enabled by policy.</summary>
     public static ModelPolicyState Enabled { get; } = new("enabled");
 
-    /// <summary>Gets the <c>disabled</c> value.</summary>
+    /// <summary>The model is disabled by policy.</summary>
     public static ModelPolicyState Disabled { get; } = new("disabled");
 
-    /// <summary>Gets the <c>unconfigured</c> value.</summary>
+    /// <summary>No explicit policy is configured for the model.</summary>
     public static ModelPolicyState Unconfigured { get; } = new("unconfigured");
 
     /// <summary>Returns a value indicating whether two <see cref="ModelPolicyState"/> instances are equivalent.</summary>
@@ -6786,16 +6829,16 @@ public DiscoveredMcpServerType(string value)
     /// <summary>Gets the value associated with this <see cref="DiscoveredMcpServerType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>stdio</c> value.</summary>
+    /// <summary>Server communicates over stdio with a local child process.</summary>
     public static DiscoveredMcpServerType Stdio { get; } = new("stdio");
 
-    /// <summary>Gets the <c>http</c> value.</summary>
+    /// <summary>Server communicates over streamable HTTP.</summary>
     public static DiscoveredMcpServerType Http { get; } = new("http");
 
-    /// <summary>Gets the <c>sse</c> value.</summary>
+    /// <summary>Server communicates over Server-Sent Events.</summary>
     public static DiscoveredMcpServerType Sse { get; } = new("sse");
 
-    /// <summary>Gets the <c>memory</c> value.</summary>
+    /// <summary>Server is backed by an in-memory runtime implementation.</summary>
     public static DiscoveredMcpServerType Memory { get; } = new("memory");
 
     /// <summary>Returns a value indicating whether two <see cref="DiscoveredMcpServerType"/> instances are equivalent.</summary>
@@ -6854,10 +6897,10 @@ public SessionFsSetProviderConventions(string value)
     /// <summary>Gets the value associated with this <see cref="SessionFsSetProviderConventions"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>windows</c> value.</summary>
+    /// <summary>Paths use Windows path conventions.</summary>
     public static SessionFsSetProviderConventions Windows { get; } = new("windows");
 
-    /// <summary>Gets the <c>posix</c> value.</summary>
+    /// <summary>Paths use POSIX path conventions.</summary>
     public static SessionFsSetProviderConventions Posix { get; } = new("posix");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionFsSetProviderConventions"/> instances are equivalent.</summary>
@@ -6917,10 +6960,10 @@ public ConnectedRemoteSessionMetadataKind(string value)
     /// <summary>Gets the value associated with this <see cref="ConnectedRemoteSessionMetadataKind"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>remote-session</c> value.</summary>
+    /// <summary>Remote CLI session.</summary>
     public static ConnectedRemoteSessionMetadataKind RemoteSession { get; } = new("remote-session");
 
-    /// <summary>Gets the <c>coding-agent</c> value.</summary>
+    /// <summary>GitHub Copilot coding agent session.</summary>
     public static ConnectedRemoteSessionMetadataKind CodingAgent { get; } = new("coding-agent");
 
     /// <summary>Returns a value indicating whether two <see cref="ConnectedRemoteSessionMetadataKind"/> instances are equivalent.</summary>
@@ -6980,10 +7023,10 @@ public SessionContextHostType(string value)
     /// <summary>Gets the value associated with this <see cref="SessionContextHostType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>github</c> value.</summary>
+    /// <summary>Session repository is hosted on GitHub.</summary>
     public static SessionContextHostType Github { get; } = new("github");
 
-    /// <summary>Gets the <c>ado</c> value.</summary>
+    /// <summary>Session repository is hosted on Azure DevOps.</summary>
     public static SessionContextHostType Ado { get; } = new("ado");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionContextHostType"/> instances are equivalent.</summary>
@@ -7042,16 +7085,16 @@ public SendAgentMode(string value)
     /// <summary>Gets the value associated with this <see cref="SendAgentMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>interactive</c> value.</summary>
+    /// <summary>The agent is responding interactively to the user.</summary>
     public static SendAgentMode Interactive { get; } = new("interactive");
 
-    /// <summary>Gets the <c>plan</c> value.</summary>
+    /// <summary>The agent is preparing a plan before making changes.</summary>
     public static SendAgentMode Plan { get; } = new("plan");
 
-    /// <summary>Gets the <c>autopilot</c> value.</summary>
+    /// <summary>The agent is working autonomously toward task completion.</summary>
     public static SendAgentMode Autopilot { get; } = new("autopilot");
 
-    /// <summary>Gets the <c>shell</c> value.</summary>
+    /// <summary>The agent is in shell-focused UI mode.</summary>
     public static SendAgentMode Shell { get; } = new("shell");
 
     /// <summary>Returns a value indicating whether two <see cref="SendAgentMode"/> instances are equivalent.</summary>
@@ -7110,13 +7153,13 @@ public SendAttachmentGithubReferenceType(string value)
     /// <summary>Gets the value associated with this <see cref="SendAttachmentGithubReferenceType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>issue</c> value.</summary>
+    /// <summary>GitHub issue reference.</summary>
     public static SendAttachmentGithubReferenceType Issue { get; } = new("issue");
 
-    /// <summary>Gets the <c>pr</c> value.</summary>
+    /// <summary>GitHub pull request reference.</summary>
     public static SendAttachmentGithubReferenceType Pr { get; } = new("pr");
 
-    /// <summary>Gets the <c>discussion</c> value.</summary>
+    /// <summary>GitHub discussion reference.</summary>
     public static SendAttachmentGithubReferenceType Discussion { get; } = new("discussion");
 
     /// <summary>Returns a value indicating whether two <see cref="SendAttachmentGithubReferenceType"/> instances are equivalent.</summary>
@@ -7175,10 +7218,10 @@ public SendMode(string value)
     /// <summary>Gets the value associated with this <see cref="SendMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>enqueue</c> value.</summary>
+    /// <summary>Append the message to the normal session queue.</summary>
     public static SendMode Enqueue { get; } = new("enqueue");
 
-    /// <summary>Gets the <c>immediate</c> value.</summary>
+    /// <summary>Interject the message during the in-progress turn.</summary>
     public static SendMode Immediate { get; } = new("immediate");
 
     /// <summary>Returns a value indicating whether two <see cref="SendMode"/> instances are equivalent.</summary>
@@ -7237,13 +7280,13 @@ public SessionLogLevel(string value)
     /// <summary>Gets the value associated with this <see cref="SessionLogLevel"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>info</c> value.</summary>
+    /// <summary>Informational message.</summary>
     public static SessionLogLevel Info { get; } = new("info");
 
-    /// <summary>Gets the <c>warning</c> value.</summary>
+    /// <summary>Warning message that may require attention.</summary>
     public static SessionLogLevel Warning { get; } = new("warning");
 
-    /// <summary>Gets the <c>error</c> value.</summary>
+    /// <summary>Error message describing a failure.</summary>
     public static SessionLogLevel Error { get; } = new("error");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionLogLevel"/> instances are equivalent.</summary>
@@ -7302,25 +7345,25 @@ public AuthInfoType(string value)
     /// <summary>Gets the value associated with this <see cref="AuthInfoType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>hmac</c> value.</summary>
+    /// <summary>Authentication provided by a GitHub App HMAC credential.</summary>
     public static AuthInfoType Hmac { get; } = new("hmac");
 
-    /// <summary>Gets the <c>env</c> value.</summary>
+    /// <summary>Authentication resolved from environment-provided credentials.</summary>
     public static AuthInfoType Env { get; } = new("env");
 
-    /// <summary>Gets the <c>user</c> value.</summary>
+    /// <summary>Authentication from an interactive user sign-in.</summary>
     public static AuthInfoType User { get; } = new("user");
 
-    /// <summary>Gets the <c>gh-cli</c> value.</summary>
+    /// <summary>Authentication delegated to the GitHub CLI.</summary>
     public static AuthInfoType GhCli { get; } = new("gh-cli");
 
-    /// <summary>Gets the <c>api-key</c> value.</summary>
+    /// <summary>Authentication from an API key credential.</summary>
     public static AuthInfoType ApiKey { get; } = new("api-key");
 
-    /// <summary>Gets the <c>token</c> value.</summary>
+    /// <summary>Authentication from a GitHub token.</summary>
     public static AuthInfoType Token { get; } = new("token");
 
-    /// <summary>Gets the <c>copilot-api-token</c> value.</summary>
+    /// <summary>Authentication from a Copilot API token.</summary>
     public static AuthInfoType CopilotApiToken { get; } = new("copilot-api-token");
 
     /// <summary>Returns a value indicating whether two <see cref="AuthInfoType"/> instances are equivalent.</summary>
@@ -7379,10 +7422,10 @@ public WorkspacesGetWorkspaceResultWorkspaceHostType(string value)
     /// <summary>Gets the value associated with this <see cref="WorkspacesGetWorkspaceResultWorkspaceHostType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>github</c> value.</summary>
+    /// <summary>Workspace repository is hosted on GitHub.</summary>
     public static WorkspacesGetWorkspaceResultWorkspaceHostType Github { get; } = new("github");
 
-    /// <summary>Gets the <c>ado</c> value.</summary>
+    /// <summary>Workspace repository is hosted on Azure DevOps.</summary>
     public static WorkspacesGetWorkspaceResultWorkspaceHostType Ado { get; } = new("ado");
 
     /// <summary>Returns a value indicating whether two <see cref="WorkspacesGetWorkspaceResultWorkspaceHostType"/> instances are equivalent.</summary>
@@ -7441,16 +7484,16 @@ public InstructionsSourcesLocation(string value)
     /// <summary>Gets the value associated with this <see cref="InstructionsSourcesLocation"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>user</c> value.</summary>
+    /// <summary>Instructions live in user-level configuration.</summary>
     public static InstructionsSourcesLocation User { get; } = new("user");
 
-    /// <summary>Gets the <c>repository</c> value.</summary>
+    /// <summary>Instructions live in repository-level configuration.</summary>
     public static InstructionsSourcesLocation Repository { get; } = new("repository");
 
-    /// <summary>Gets the <c>working-directory</c> value.</summary>
+    /// <summary>Instructions live under the current working directory.</summary>
     public static InstructionsSourcesLocation WorkingDirectory { get; } = new("working-directory");
 
-    /// <summary>Gets the <c>plugin</c> value.</summary>
+    /// <summary>Instructions live in plugin-provided configuration.</summary>
     public static InstructionsSourcesLocation Plugin { get; } = new("plugin");
 
     /// <summary>Returns a value indicating whether two <see cref="InstructionsSourcesLocation"/> instances are equivalent.</summary>
@@ -7509,25 +7552,25 @@ public InstructionsSourcesType(string value)
     /// <summary>Gets the value associated with this <see cref="InstructionsSourcesType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>home</c> value.</summary>
+    /// <summary>Instructions loaded from the user's home configuration.</summary>
     public static InstructionsSourcesType Home { get; } = new("home");
 
-    /// <summary>Gets the <c>repo</c> value.</summary>
+    /// <summary>Instructions loaded from repository-scoped files.</summary>
     public static InstructionsSourcesType Repo { get; } = new("repo");
 
-    /// <summary>Gets the <c>model</c> value.</summary>
+    /// <summary>Instructions loaded from model-specific files.</summary>
     public static InstructionsSourcesType Model { get; } = new("model");
 
-    /// <summary>Gets the <c>vscode</c> value.</summary>
+    /// <summary>Instructions loaded from VS Code instruction files.</summary>
     public static InstructionsSourcesType Vscode { get; } = new("vscode");
 
-    /// <summary>Gets the <c>nested-agents</c> value.</summary>
+    /// <summary>Instructions discovered from nested agent files.</summary>
     public static InstructionsSourcesType NestedAgents { get; } = new("nested-agents");
 
-    /// <summary>Gets the <c>child-instructions</c> value.</summary>
+    /// <summary>Instructions inherited from child instruction files.</summary>
     public static InstructionsSourcesType ChildInstructions { get; } = new("child-instructions");
 
-    /// <summary>Gets the <c>plugin</c> value.</summary>
+    /// <summary>Instructions supplied by an installed plugin.</summary>
     public static InstructionsSourcesType Plugin { get; } = new("plugin");
 
     /// <summary>Returns a value indicating whether two <see cref="InstructionsSourcesType"/> instances are equivalent.</summary>
@@ -7587,22 +7630,22 @@ public AgentInfoSource(string value)
     /// <summary>Gets the value associated with this <see cref="AgentInfoSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>user</c> value.</summary>
+    /// <summary>Agent loaded from the user's personal agent configuration.</summary>
     public static AgentInfoSource User { get; } = new("user");
 
-    /// <summary>Gets the <c>project</c> value.</summary>
+    /// <summary>Agent loaded from the current project's repository configuration.</summary>
     public static AgentInfoSource Project { get; } = new("project");
 
-    /// <summary>Gets the <c>inherited</c> value.</summary>
+    /// <summary>Agent inherited from a parent project or workspace.</summary>
     public static AgentInfoSource Inherited { get; } = new("inherited");
 
-    /// <summary>Gets the <c>remote</c> value.</summary>
+    /// <summary>Agent provided by a remote runtime or service.</summary>
     public static AgentInfoSource Remote { get; } = new("remote");
 
-    /// <summary>Gets the <c>plugin</c> value.</summary>
+    /// <summary>Agent contributed by an installed plugin.</summary>
     public static AgentInfoSource Plugin { get; } = new("plugin");
 
-    /// <summary>Gets the <c>builtin</c> value.</summary>
+    /// <summary>Agent built into the Copilot runtime.</summary>
     public static AgentInfoSource Builtin { get; } = new("builtin");
 
     /// <summary>Returns a value indicating whether two <see cref="AgentInfoSource"/> instances are equivalent.</summary>
@@ -7662,10 +7705,10 @@ public TaskExecutionMode(string value)
     /// <summary>Gets the value associated with this <see cref="TaskExecutionMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>sync</c> value.</summary>
+    /// <summary>The task was started with synchronous waiting.</summary>
     public static TaskExecutionMode Sync { get; } = new("sync");
 
-    /// <summary>Gets the <c>background</c> value.</summary>
+    /// <summary>The task is managed in the background.</summary>
     public static TaskExecutionMode Background { get; } = new("background");
 
     /// <summary>Returns a value indicating whether two <see cref="TaskExecutionMode"/> instances are equivalent.</summary>
@@ -7725,19 +7768,19 @@ public TaskStatus(string value)
     /// <summary>Gets the value associated with this <see cref="TaskStatus"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>running</c> value.</summary>
+    /// <summary>The task is actively executing.</summary>
     public static TaskStatus Running { get; } = new("running");
 
-    /// <summary>Gets the <c>idle</c> value.</summary>
+    /// <summary>The task is waiting for additional input.</summary>
     public static TaskStatus Idle { get; } = new("idle");
 
-    /// <summary>Gets the <c>completed</c> value.</summary>
+    /// <summary>The task finished successfully.</summary>
     public static TaskStatus Completed { get; } = new("completed");
 
-    /// <summary>Gets the <c>failed</c> value.</summary>
+    /// <summary>The task finished with an error.</summary>
     public static TaskStatus Failed { get; } = new("failed");
 
-    /// <summary>Gets the <c>cancelled</c> value.</summary>
+    /// <summary>The task was cancelled before completion.</summary>
     public static TaskStatus Cancelled { get; } = new("cancelled");
 
     /// <summary>Returns a value indicating whether two <see cref="TaskStatus"/> instances are equivalent.</summary>
@@ -7797,10 +7840,10 @@ public TaskShellInfoAttachmentMode(string value)
     /// <summary>Gets the value associated with this <see cref="TaskShellInfoAttachmentMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>attached</c> value.</summary>
+    /// <summary>The shell runs in a managed PTY session.</summary>
     public static TaskShellInfoAttachmentMode Attached { get; } = new("attached");
 
-    /// <summary>Gets the <c>detached</c> value.</summary>
+    /// <summary>The shell runs as an independent background process.</summary>
     public static TaskShellInfoAttachmentMode Detached { get; } = new("detached");
 
     /// <summary>Returns a value indicating whether two <see cref="TaskShellInfoAttachmentMode"/> instances are equivalent.</summary>
@@ -7860,13 +7903,13 @@ public McpSamplingExecutionAction(string value)
     /// <summary>Gets the value associated with this <see cref="McpSamplingExecutionAction"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>success</c> value.</summary>
+    /// <summary>The sampling inference completed and produced a result.</summary>
     public static McpSamplingExecutionAction Success { get; } = new("success");
 
-    /// <summary>Gets the <c>failure</c> value.</summary>
+    /// <summary>The sampling inference failed or was rejected.</summary>
     public static McpSamplingExecutionAction Failure { get; } = new("failure");
 
-    /// <summary>Gets the <c>cancelled</c> value.</summary>
+    /// <summary>The sampling inference was cancelled before completion.</summary>
     public static McpSamplingExecutionAction Cancelled { get; } = new("cancelled");
 
     /// <summary>Returns a value indicating whether two <see cref="McpSamplingExecutionAction"/> instances are equivalent.</summary>
@@ -7926,10 +7969,10 @@ public McpSetEnvValueModeDetails(string value)
     /// <summary>Gets the value associated with this <see cref="McpSetEnvValueModeDetails"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>direct</c> value.</summary>
+    /// <summary>Treat MCP server environment values as literal strings.</summary>
     public static McpSetEnvValueModeDetails Direct { get; } = new("direct");
 
-    /// <summary>Gets the <c>indirect</c> value.</summary>
+    /// <summary>Treat MCP server environment values as host-side references to resolve before launch.</summary>
     public static McpSetEnvValueModeDetails Indirect { get; } = new("indirect");
 
     /// <summary>Returns a value indicating whether two <see cref="McpSetEnvValueModeDetails"/> instances are equivalent.</summary>
@@ -7989,10 +8032,10 @@ public OptionsUpdateEnvValueMode(string value)
     /// <summary>Gets the value associated with this <see cref="OptionsUpdateEnvValueMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>direct</c> value.</summary>
+    /// <summary>Pass MCP server environment values as literal strings.</summary>
     public static OptionsUpdateEnvValueMode Direct { get; } = new("direct");
 
-    /// <summary>Gets the <c>indirect</c> value.</summary>
+    /// <summary>Resolve MCP server environment values from host-side references.</summary>
     public static OptionsUpdateEnvValueMode Indirect { get; } = new("indirect");
 
     /// <summary>Returns a value indicating whether two <see cref="OptionsUpdateEnvValueMode"/> instances are equivalent.</summary>
@@ -8052,10 +8095,10 @@ public ExtensionSource(string value)
     /// <summary>Gets the value associated with this <see cref="ExtensionSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>project</c> value.</summary>
+    /// <summary>Extension discovered from the current project's .github/extensions directory.</summary>
     public static ExtensionSource Project { get; } = new("project");
 
-    /// <summary>Gets the <c>user</c> value.</summary>
+    /// <summary>Extension discovered from the user's ~/.copilot/extensions directory.</summary>
     public static ExtensionSource User { get; } = new("user");
 
     /// <summary>Returns a value indicating whether two <see cref="ExtensionSource"/> instances are equivalent.</summary>
@@ -8115,16 +8158,16 @@ public ExtensionStatus(string value)
     /// <summary>Gets the value associated with this <see cref="ExtensionStatus"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>running</c> value.</summary>
+    /// <summary>The extension process is running.</summary>
     public static ExtensionStatus Running { get; } = new("running");
 
-    /// <summary>Gets the <c>disabled</c> value.</summary>
+    /// <summary>The extension is installed but disabled.</summary>
     public static ExtensionStatus Disabled { get; } = new("disabled");
 
-    /// <summary>Gets the <c>failed</c> value.</summary>
+    /// <summary>The extension failed to start or crashed.</summary>
     public static ExtensionStatus Failed { get; } = new("failed");
 
-    /// <summary>Gets the <c>starting</c> value.</summary>
+    /// <summary>The extension process is starting.</summary>
     public static ExtensionStatus Starting { get; } = new("starting");
 
     /// <summary>Returns a value indicating whether two <see cref="ExtensionStatus"/> instances are equivalent.</summary>
@@ -8183,7 +8226,7 @@ public SlashCommandInputCompletion(string value)
     /// <summary>Gets the value associated with this <see cref="SlashCommandInputCompletion"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>directory</c> value.</summary>
+    /// <summary>Input should complete filesystem directories.</summary>
     public static SlashCommandInputCompletion Directory { get; } = new("directory");
 
     /// <summary>Returns a value indicating whether two <see cref="SlashCommandInputCompletion"/> instances are equivalent.</summary>
@@ -8242,13 +8285,13 @@ public SlashCommandKind(string value)
     /// <summary>Gets the value associated with this <see cref="SlashCommandKind"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>builtin</c> value.</summary>
+    /// <summary>Command implemented by the runtime.</summary>
     public static SlashCommandKind Builtin { get; } = new("builtin");
 
-    /// <summary>Gets the <c>skill</c> value.</summary>
+    /// <summary>Command backed by a skill.</summary>
     public static SlashCommandKind Skill { get; } = new("skill");
 
-    /// <summary>Gets the <c>client</c> value.</summary>
+    /// <summary>Command registered by an SDK client or extension.</summary>
     public static SlashCommandKind Client { get; } = new("client");
 
     /// <summary>Returns a value indicating whether two <see cref="SlashCommandKind"/> instances are equivalent.</summary>
@@ -8307,13 +8350,13 @@ public UIElicitationResponseAction(string value)
     /// <summary>Gets the value associated with this <see cref="UIElicitationResponseAction"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>accept</c> value.</summary>
+    /// <summary>The user submitted the requested form values.</summary>
     public static UIElicitationResponseAction Accept { get; } = new("accept");
 
-    /// <summary>Gets the <c>decline</c> value.</summary>
+    /// <summary>The user explicitly declined to provide the requested input.</summary>
     public static UIElicitationResponseAction Decline { get; } = new("decline");
 
-    /// <summary>Gets the <c>cancel</c> value.</summary>
+    /// <summary>The user dismissed the elicitation request.</summary>
     public static UIElicitationResponseAction Cancel { get; } = new("cancel");
 
     /// <summary>Returns a value indicating whether two <see cref="UIElicitationResponseAction"/> instances are equivalent.</summary>
@@ -8372,13 +8415,13 @@ public UIAutoModeSwitchResponse(string value)
     /// <summary>Gets the value associated with this <see cref="UIAutoModeSwitchResponse"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>yes</c> value.</summary>
+    /// <summary>Allow the automatic mode switch for this turn.</summary>
     public static UIAutoModeSwitchResponse Yes { get; } = new("yes");
 
-    /// <summary>Gets the <c>yes_always</c> value.</summary>
+    /// <summary>Allow this mode switch and persist the preference.</summary>
     public static UIAutoModeSwitchResponse YesAlways { get; } = new("yes_always");
 
-    /// <summary>Gets the <c>no</c> value.</summary>
+    /// <summary>Decline the automatic mode switch.</summary>
     public static UIAutoModeSwitchResponse No { get; } = new("no");
 
     /// <summary>Returns a value indicating whether two <see cref="UIAutoModeSwitchResponse"/> instances are equivalent.</summary>
@@ -8437,16 +8480,16 @@ public UIExitPlanModeAction(string value)
     /// <summary>Gets the value associated with this <see cref="UIExitPlanModeAction"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>exit_only</c> value.</summary>
+    /// <summary>Exit plan mode without starting implementation.</summary>
     public static UIExitPlanModeAction ExitOnly { get; } = new("exit_only");
 
-    /// <summary>Gets the <c>interactive</c> value.</summary>
+    /// <summary>Exit plan mode and continue interactively.</summary>
     public static UIExitPlanModeAction Interactive { get; } = new("interactive");
 
-    /// <summary>Gets the <c>autopilot</c> value.</summary>
+    /// <summary>Exit plan mode and continue in autopilot mode.</summary>
     public static UIExitPlanModeAction Autopilot { get; } = new("autopilot");
 
-    /// <summary>Gets the <c>autopilot_fleet</c> value.</summary>
+    /// <summary>Exit plan mode and continue in autopilot mode with parallel subagent execution.</summary>
     public static UIExitPlanModeAction AutopilotFleet { get; } = new("autopilot_fleet");
 
     /// <summary>Returns a value indicating whether two <see cref="UIExitPlanModeAction"/> instances are equivalent.</summary>
@@ -8505,10 +8548,10 @@ public PermissionsConfigureAdditionalContentExclusionPolicyScope(string value)
     /// <summary>Gets the value associated with this <see cref="PermissionsConfigureAdditionalContentExclusionPolicyScope"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>repo</c> value.</summary>
+    /// <summary>The content exclusion policy applies to the current repository.</summary>
     public static PermissionsConfigureAdditionalContentExclusionPolicyScope Repo { get; } = new("repo");
 
-    /// <summary>Gets the <c>all</c> value.</summary>
+    /// <summary>The content exclusion policy applies across all repositories.</summary>
     public static PermissionsConfigureAdditionalContentExclusionPolicyScope All { get; } = new("all");
 
     /// <summary>Returns a value indicating whether two <see cref="PermissionsConfigureAdditionalContentExclusionPolicyScope"/> instances are equivalent.</summary>
@@ -8567,16 +8610,16 @@ public PermissionsSetApproveAllSource(string value)
     /// <summary>Gets the value associated with this <see cref="PermissionsSetApproveAllSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>cli_flag</c> value.</summary>
+    /// <summary>Allow-all was enabled from a CLI command-line flag.</summary>
     public static PermissionsSetApproveAllSource CliFlag { get; } = new("cli_flag");
 
-    /// <summary>Gets the <c>slash_command</c> value.</summary>
+    /// <summary>Allow-all was enabled by a slash command.</summary>
     public static PermissionsSetApproveAllSource SlashCommand { get; } = new("slash_command");
 
-    /// <summary>Gets the <c>autopilot_confirmation</c> value.</summary>
+    /// <summary>Allow-all was enabled by confirming autopilot behavior.</summary>
     public static PermissionsSetApproveAllSource AutopilotConfirmation { get; } = new("autopilot_confirmation");
 
-    /// <summary>Gets the <c>rpc</c> value.</summary>
+    /// <summary>Allow-all was enabled through an RPC caller.</summary>
     public static PermissionsSetApproveAllSource Rpc { get; } = new("rpc");
 
     /// <summary>Returns a value indicating whether two <see cref="PermissionsSetApproveAllSource"/> instances are equivalent.</summary>
@@ -8635,10 +8678,10 @@ public PermissionsModifyRulesScope(string value)
     /// <summary>Gets the value associated with this <see cref="PermissionsModifyRulesScope"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>session</c> value.</summary>
+    /// <summary>Apply the rule change only to this session.</summary>
     public static PermissionsModifyRulesScope Session { get; } = new("session");
 
-    /// <summary>Gets the <c>location</c> value.</summary>
+    /// <summary>Persist the rule change for this project location.</summary>
     public static PermissionsModifyRulesScope Location { get; } = new("location");
 
     /// <summary>Returns a value indicating whether two <see cref="PermissionsModifyRulesScope"/> instances are equivalent.</summary>
@@ -8698,13 +8741,13 @@ public MetadataSnapshotCurrentMode(string value)
     /// <summary>Gets the value associated with this <see cref="MetadataSnapshotCurrentMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>interactive</c> value.</summary>
+    /// <summary>The agent is responding interactively to the user.</summary>
     public static MetadataSnapshotCurrentMode Interactive { get; } = new("interactive");
 
-    /// <summary>Gets the <c>plan</c> value.</summary>
+    /// <summary>The agent is preparing a plan before making changes.</summary>
     public static MetadataSnapshotCurrentMode Plan { get; } = new("plan");
 
-    /// <summary>Gets the <c>autopilot</c> value.</summary>
+    /// <summary>The agent is working autonomously toward task completion.</summary>
     public static MetadataSnapshotCurrentMode Autopilot { get; } = new("autopilot");
 
     /// <summary>Returns a value indicating whether two <see cref="MetadataSnapshotCurrentMode"/> instances are equivalent.</summary>
@@ -8764,10 +8807,10 @@ public MetadataSnapshotRemoteMetadataTaskType(string value)
     /// <summary>Gets the value associated with this <see cref="MetadataSnapshotRemoteMetadataTaskType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>cca</c> value.</summary>
+    /// <summary>Remote task originated from Copilot Coding Agent.</summary>
     public static MetadataSnapshotRemoteMetadataTaskType Cca { get; } = new("cca");
 
-    /// <summary>Gets the <c>cli</c> value.</summary>
+    /// <summary>Remote task originated from a CLI remote-session invocation.</summary>
     public static MetadataSnapshotRemoteMetadataTaskType Cli { get; } = new("cli");
 
     /// <summary>Returns a value indicating whether two <see cref="MetadataSnapshotRemoteMetadataTaskType"/> instances are equivalent.</summary>
@@ -8826,10 +8869,10 @@ public SessionMetadataSnapshotWorkspaceHostType(string value)
     /// <summary>Gets the value associated with this <see cref="SessionMetadataSnapshotWorkspaceHostType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>github</c> value.</summary>
+    /// <summary>Workspace summary repository is hosted on GitHub.</summary>
     public static SessionMetadataSnapshotWorkspaceHostType Github { get; } = new("github");
 
-    /// <summary>Gets the <c>ado</c> value.</summary>
+    /// <summary>Workspace summary repository is hosted on Azure DevOps.</summary>
     public static SessionMetadataSnapshotWorkspaceHostType Ado { get; } = new("ado");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionMetadataSnapshotWorkspaceHostType"/> instances are equivalent.</summary>
@@ -8889,10 +8932,10 @@ public SessionWorkingDirectoryContextHostType(string value)
     /// <summary>Gets the value associated with this <see cref="SessionWorkingDirectoryContextHostType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>github</c> value.</summary>
+    /// <summary>The working directory repository is hosted on GitHub.</summary>
     public static SessionWorkingDirectoryContextHostType Github { get; } = new("github");
 
-    /// <summary>Gets the <c>ado</c> value.</summary>
+    /// <summary>The working directory repository is hosted on Azure DevOps.</summary>
     public static SessionWorkingDirectoryContextHostType Ado { get; } = new("ado");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionWorkingDirectoryContextHostType"/> instances are equivalent.</summary>
@@ -8951,13 +8994,13 @@ public ShellKillSignal(string value)
     /// <summary>Gets the value associated with this <see cref="ShellKillSignal"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>SIGTERM</c> value.</summary>
+    /// <summary>Request graceful process termination.</summary>
     public static ShellKillSignal SIGTERM { get; } = new("SIGTERM");
 
-    /// <summary>Gets the <c>SIGKILL</c> value.</summary>
+    /// <summary>Forcefully terminate the process.</summary>
     public static ShellKillSignal SIGKILL { get; } = new("SIGKILL");
 
-    /// <summary>Gets the <c>SIGINT</c> value.</summary>
+    /// <summary>Send an interrupt signal to the process.</summary>
     public static ShellKillSignal SIGINT { get; } = new("SIGINT");
 
     /// <summary>Returns a value indicating whether two <see cref="ShellKillSignal"/> instances are equivalent.</summary>
@@ -9017,10 +9060,10 @@ public QueuePendingItemsKind(string value)
     /// <summary>Gets the value associated with this <see cref="QueuePendingItemsKind"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>message</c> value.</summary>
+    /// <summary>A queued user message.</summary>
     public static QueuePendingItemsKind Message { get; } = new("message");
 
-    /// <summary>Gets the <c>command</c> value.</summary>
+    /// <summary>A queued slash command or model-change command.</summary>
     public static QueuePendingItemsKind Command { get; } = new("command");
 
     /// <summary>Returns a value indicating whether two <see cref="QueuePendingItemsKind"/> instances are equivalent.</summary>
@@ -9080,10 +9123,10 @@ public EventsCursorStatus(string value)
     /// <summary>Gets the value associated with this <see cref="EventsCursorStatus"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>ok</c> value.</summary>
+    /// <summary>The cursor was applied successfully.</summary>
     public static EventsCursorStatus Ok { get; } = new("ok");
 
-    /// <summary>Gets the <c>expired</c> value.</summary>
+    /// <summary>The cursor referred to history that is no longer available.</summary>
     public static EventsCursorStatus Expired { get; } = new("expired");
 
     /// <summary>Returns a value indicating whether two <see cref="EventsCursorStatus"/> instances are equivalent.</summary>
@@ -9143,10 +9186,10 @@ public EventsAgentScope(string value)
     /// <summary>Gets the value associated with this <see cref="EventsAgentScope"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>primary</c> value.</summary>
+    /// <summary>Return main-agent events and typed subagent lifecycle events.</summary>
     public static EventsAgentScope Primary { get; } = new("primary");
 
-    /// <summary>Gets the <c>all</c> value.</summary>
+    /// <summary>Return events from all agents.</summary>
     public static EventsAgentScope All { get; } = new("all");
 
     /// <summary>Returns a value indicating whether two <see cref="EventsAgentScope"/> instances are equivalent.</summary>
@@ -9206,13 +9249,13 @@ public RemoteSessionMode(string value)
     /// <summary>Gets the value associated with this <see cref="RemoteSessionMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>off</c> value.</summary>
+    /// <summary>Disable remote session export and steering.</summary>
     public static RemoteSessionMode Off { get; } = new("off");
 
-    /// <summary>Gets the <c>export</c> value.</summary>
+    /// <summary>Export session events to GitHub without enabling remote steering.</summary>
     public static RemoteSessionMode Export { get; } = new("export");
 
-    /// <summary>Gets the <c>on</c> value.</summary>
+    /// <summary>Enable both remote session export and remote steering.</summary>
     public static RemoteSessionMode On { get; } = new("on");
 
     /// <summary>Returns a value indicating whether two <see cref="RemoteSessionMode"/> instances are equivalent.</summary>
@@ -9271,10 +9314,10 @@ public SessionFsErrorCode(string value)
     /// <summary>Gets the value associated with this <see cref="SessionFsErrorCode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>ENOENT</c> value.</summary>
+    /// <summary>The requested path does not exist.</summary>
     public static SessionFsErrorCode ENOENT { get; } = new("ENOENT");
 
-    /// <summary>Gets the <c>UNKNOWN</c> value.</summary>
+    /// <summary>The filesystem operation failed for an unspecified reason.</summary>
     public static SessionFsErrorCode UNKNOWN { get; } = new("UNKNOWN");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionFsErrorCode"/> instances are equivalent.</summary>
@@ -9333,10 +9376,10 @@ public SessionFsReaddirWithTypesEntryType(string value)
     /// <summary>Gets the value associated with this <see cref="SessionFsReaddirWithTypesEntryType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>file</c> value.</summary>
+    /// <summary>The entry is a file.</summary>
     public static SessionFsReaddirWithTypesEntryType File { get; } = new("file");
 
-    /// <summary>Gets the <c>directory</c> value.</summary>
+    /// <summary>The entry is a directory.</summary>
     public static SessionFsReaddirWithTypesEntryType Directory { get; } = new("directory");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionFsReaddirWithTypesEntryType"/> instances are equivalent.</summary>
@@ -9395,13 +9438,13 @@ public SessionFsSqliteQueryType(string value)
     /// <summary>Gets the value associated with this <see cref="SessionFsSqliteQueryType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>exec</c> value.</summary>
+    /// <summary>Execute DDL or multi-statement SQL without returning rows.</summary>
     public static SessionFsSqliteQueryType Exec { get; } = new("exec");
 
-    /// <summary>Gets the <c>query</c> value.</summary>
+    /// <summary>Execute a SELECT-style query and return rows.</summary>
     public static SessionFsSqliteQueryType Query { get; } = new("query");
 
-    /// <summary>Gets the <c>run</c> value.</summary>
+    /// <summary>Execute INSERT, UPDATE, or DELETE SQL and return affected-row metadata.</summary>
     public static SessionFsSqliteQueryType Run { get; } = new("run");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionFsSqliteQueryType"/> instances are equivalent.</summary>
@@ -12844,6 +12887,7 @@ public static void RegisterClientSessionApiHandlers(JsonRpc rpc, Func<string, Cl
 [JsonSerializable(typeof(SlashCommandInfo))]
 [JsonSerializable(typeof(SlashCommandInput))]
 [JsonSerializable(typeof(SlashCommandInvocationResult))]
+[JsonSerializable(typeof(SlashCommandSelectSubcommandOption))]
 [JsonSerializable(typeof(TaskInfo))]
 [JsonSerializable(typeof(TaskList))]
 [JsonSerializable(typeof(TasksCancelRequest))]
diff --git a/dotnet/src/Generated/SessionEvents.cs b/dotnet/src/Generated/SessionEvents.cs
index 3a96bd610..c5a00b5d6 100644
--- a/dotnet/src/Generated/SessionEvents.cs
+++ b/dotnet/src/Generated/SessionEvents.cs
@@ -2198,8 +2198,8 @@ public sealed partial class AssistantUsageData
     /// <summary>Time to first token in milliseconds. Only available for streaming requests.</summary>
     [JsonConverter(typeof(MillisecondsTimeSpanConverter))]
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
-    [JsonPropertyName("ttftMs")]
-    public TimeSpan? Ttft { get; set; }
+    [JsonPropertyName("timeToFirstTokenMs")]
+    public TimeSpan? TimeToFirstToken { get; set; }
 }
 
 /// <summary>Failed LLM API call metadata for telemetry.</summary>
@@ -3781,6 +3781,8 @@ public sealed partial class ToolExecutionCompleteContentResourceLink : ToolExecu
     public string? Title { get; set; }
 
     /// <summary>URI identifying the resource.</summary>
+    [Url]
+    [StringSyntax(StringSyntaxAttribute.Uri)]
     [JsonPropertyName("uri")]
     public required string Uri { get; set; }
 }
@@ -3799,6 +3801,8 @@ public sealed partial class EmbeddedTextResourceContents
     public required string Text { get; set; }
 
     /// <summary>URI identifying the resource.</summary>
+    [Url]
+    [StringSyntax(StringSyntaxAttribute.Uri)]
     [JsonPropertyName("uri")]
     public required string Uri { get; set; }
 }
@@ -3818,6 +3822,8 @@ public sealed partial class EmbeddedBlobResourceContents
     public string? MimeType { get; set; }
 
     /// <summary>URI identifying the resource.</summary>
+    [Url]
+    [StringSyntax(StringSyntaxAttribute.Uri)]
     [JsonPropertyName("uri")]
     public required string Uri { get; set; }
 }
@@ -5308,10 +5314,10 @@ public WorkingDirectoryContextHostType(string value)
     /// <summary>Gets the value associated with this <see cref="WorkingDirectoryContextHostType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>github</c> value.</summary>
+    /// <summary>Repository is hosted on GitHub.</summary>
     public static WorkingDirectoryContextHostType Github { get; } = new("github");
 
-    /// <summary>Gets the <c>ado</c> value.</summary>
+    /// <summary>Repository is hosted on Azure DevOps.</summary>
     public static WorkingDirectoryContextHostType Ado { get; } = new("ado");
 
     /// <summary>Returns a value indicating whether two <see cref="WorkingDirectoryContextHostType"/> instances are equivalent.</summary>
@@ -5369,13 +5375,13 @@ public ReasoningSummary(string value)
     /// <summary>Gets the value associated with this <see cref="ReasoningSummary"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>none</c> value.</summary>
+    /// <summary>Do not request reasoning summaries from the model.</summary>
     public static ReasoningSummary None { get; } = new("none");
 
-    /// <summary>Gets the <c>concise</c> value.</summary>
+    /// <summary>Request a concise summary of the model's reasoning.</summary>
     public static ReasoningSummary Concise { get; } = new("concise");
 
-    /// <summary>Gets the <c>detailed</c> value.</summary>
+    /// <summary>Request a detailed summary of the model's reasoning.</summary>
     public static ReasoningSummary Detailed { get; } = new("detailed");
 
     /// <summary>Returns a value indicating whether two <see cref="ReasoningSummary"/> instances are equivalent.</summary>
@@ -5433,13 +5439,13 @@ public SessionMode(string value)
     /// <summary>Gets the value associated with this <see cref="SessionMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>interactive</c> value.</summary>
+    /// <summary>The agent is responding interactively to the user.</summary>
     public static SessionMode Interactive { get; } = new("interactive");
 
-    /// <summary>Gets the <c>plan</c> value.</summary>
+    /// <summary>The agent is preparing a plan before making changes.</summary>
     public static SessionMode Plan { get; } = new("plan");
 
-    /// <summary>Gets the <c>autopilot</c> value.</summary>
+    /// <summary>The agent is working autonomously toward task completion.</summary>
     public static SessionMode Autopilot { get; } = new("autopilot");
 
     /// <summary>Returns a value indicating whether two <see cref="SessionMode"/> instances are equivalent.</summary>
@@ -5497,13 +5503,13 @@ public PlanChangedOperation(string value)
     /// <summary>Gets the value associated with this <see cref="PlanChangedOperation"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>create</c> value.</summary>
+    /// <summary>The plan file was created.</summary>
     public static PlanChangedOperation Create { get; } = new("create");
 
-    /// <summary>Gets the <c>update</c> value.</summary>
+    /// <summary>The plan file was updated.</summary>
     public static PlanChangedOperation Update { get; } = new("update");
 
-    /// <summary>Gets the <c>delete</c> value.</summary>
+    /// <summary>The plan file was deleted.</summary>
     public static PlanChangedOperation Delete { get; } = new("delete");
 
     /// <summary>Returns a value indicating whether two <see cref="PlanChangedOperation"/> instances are equivalent.</summary>
@@ -5561,10 +5567,10 @@ public WorkspaceFileChangedOperation(string value)
     /// <summary>Gets the value associated with this <see cref="WorkspaceFileChangedOperation"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>create</c> value.</summary>
+    /// <summary>The workspace file was created.</summary>
     public static WorkspaceFileChangedOperation Create { get; } = new("create");
 
-    /// <summary>Gets the <c>update</c> value.</summary>
+    /// <summary>The workspace file was updated.</summary>
     public static WorkspaceFileChangedOperation Update { get; } = new("update");
 
     /// <summary>Returns a value indicating whether two <see cref="WorkspaceFileChangedOperation"/> instances are equivalent.</summary>
@@ -5622,10 +5628,10 @@ public HandoffSourceType(string value)
     /// <summary>Gets the value associated with this <see cref="HandoffSourceType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>remote</c> value.</summary>
+    /// <summary>The handoff originated from a remote session.</summary>
     public static HandoffSourceType Remote { get; } = new("remote");
 
-    /// <summary>Gets the <c>local</c> value.</summary>
+    /// <summary>The handoff originated from a local session.</summary>
     public static HandoffSourceType Local { get; } = new("local");
 
     /// <summary>Returns a value indicating whether two <see cref="HandoffSourceType"/> instances are equivalent.</summary>
@@ -5683,10 +5689,10 @@ public ShutdownType(string value)
     /// <summary>Gets the value associated with this <see cref="ShutdownType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>routine</c> value.</summary>
+    /// <summary>The session ended normally.</summary>
     public static ShutdownType Routine { get; } = new("routine");
 
-    /// <summary>Gets the <c>error</c> value.</summary>
+    /// <summary>The session ended because of a crash or fatal error.</summary>
     public static ShutdownType Error { get; } = new("error");
 
     /// <summary>Returns a value indicating whether two <see cref="ShutdownType"/> instances are equivalent.</summary>
@@ -5744,16 +5750,16 @@ public UserMessageAgentMode(string value)
     /// <summary>Gets the value associated with this <see cref="UserMessageAgentMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>interactive</c> value.</summary>
+    /// <summary>The agent is responding interactively to the user.</summary>
     public static UserMessageAgentMode Interactive { get; } = new("interactive");
 
-    /// <summary>Gets the <c>plan</c> value.</summary>
+    /// <summary>The agent is preparing a plan before making changes.</summary>
     public static UserMessageAgentMode Plan { get; } = new("plan");
 
-    /// <summary>Gets the <c>autopilot</c> value.</summary>
+    /// <summary>The agent is working autonomously toward task completion.</summary>
     public static UserMessageAgentMode Autopilot { get; } = new("autopilot");
 
-    /// <summary>Gets the <c>shell</c> value.</summary>
+    /// <summary>The agent is in shell-focused UI mode.</summary>
     public static UserMessageAgentMode Shell { get; } = new("shell");
 
     /// <summary>Returns a value indicating whether two <see cref="UserMessageAgentMode"/> instances are equivalent.</summary>
@@ -5811,13 +5817,13 @@ public UserMessageAttachmentGithubReferenceType(string value)
     /// <summary>Gets the value associated with this <see cref="UserMessageAttachmentGithubReferenceType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>issue</c> value.</summary>
+    /// <summary>GitHub issue reference.</summary>
     public static UserMessageAttachmentGithubReferenceType Issue { get; } = new("issue");
 
-    /// <summary>Gets the <c>pr</c> value.</summary>
+    /// <summary>GitHub pull request reference.</summary>
     public static UserMessageAttachmentGithubReferenceType Pr { get; } = new("pr");
 
-    /// <summary>Gets the <c>discussion</c> value.</summary>
+    /// <summary>GitHub discussion reference.</summary>
     public static UserMessageAttachmentGithubReferenceType Discussion { get; } = new("discussion");
 
     /// <summary>Returns a value indicating whether two <see cref="UserMessageAttachmentGithubReferenceType"/> instances are equivalent.</summary>
@@ -5875,10 +5881,10 @@ public AssistantMessageToolRequestType(string value)
     /// <summary>Gets the value associated with this <see cref="AssistantMessageToolRequestType"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>function</c> value.</summary>
+    /// <summary>Standard function-style tool call.</summary>
     public static AssistantMessageToolRequestType Function { get; } = new("function");
 
-    /// <summary>Gets the <c>custom</c> value.</summary>
+    /// <summary>Custom grammar-based tool call.</summary>
     public static AssistantMessageToolRequestType Custom { get; } = new("custom");
 
     /// <summary>Returns a value indicating whether two <see cref="AssistantMessageToolRequestType"/> instances are equivalent.</summary>
@@ -5936,16 +5942,16 @@ public AssistantUsageApiEndpoint(string value)
     /// <summary>Gets the value associated with this <see cref="AssistantUsageApiEndpoint"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>/chat/completions</c> value.</summary>
+    /// <summary>Chat Completions API endpoint.</summary>
     public static AssistantUsageApiEndpoint ChatCompletions { get; } = new("/chat/completions");
 
-    /// <summary>Gets the <c>/v1/messages</c> value.</summary>
+    /// <summary>Anthropic Messages API endpoint.</summary>
     public static AssistantUsageApiEndpoint V1Messages { get; } = new("/v1/messages");
 
-    /// <summary>Gets the <c>/responses</c> value.</summary>
+    /// <summary>Responses API endpoint.</summary>
     public static AssistantUsageApiEndpoint Responses { get; } = new("/responses");
 
-    /// <summary>Gets the <c>ws:/responses</c> value.</summary>
+    /// <summary>WebSocket Responses API endpoint.</summary>
     public static AssistantUsageApiEndpoint WsResponses { get; } = new("ws:/responses");
 
     /// <summary>Returns a value indicating whether two <see cref="AssistantUsageApiEndpoint"/> instances are equivalent.</summary>
@@ -6003,13 +6009,13 @@ public ModelCallFailureSource(string value)
     /// <summary>Gets the value associated with this <see cref="ModelCallFailureSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>top_level</c> value.</summary>
+    /// <summary>Model call from the top-level agent.</summary>
     public static ModelCallFailureSource TopLevel { get; } = new("top_level");
 
-    /// <summary>Gets the <c>subagent</c> value.</summary>
+    /// <summary>Model call from a sub-agent.</summary>
     public static ModelCallFailureSource Subagent { get; } = new("subagent");
 
-    /// <summary>Gets the <c>mcp_sampling</c> value.</summary>
+    /// <summary>Model call from MCP sampling.</summary>
     public static ModelCallFailureSource McpSampling { get; } = new("mcp_sampling");
 
     /// <summary>Returns a value indicating whether two <see cref="ModelCallFailureSource"/> instances are equivalent.</summary>
@@ -6067,13 +6073,13 @@ public AbortReason(string value)
     /// <summary>Gets the value associated with this <see cref="AbortReason"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>user_initiated</c> value.</summary>
+    /// <summary>The local user requested the abort, for example by pressing Ctrl+C in the CLI.</summary>
     public static AbortReason UserInitiated { get; } = new("user_initiated");
 
-    /// <summary>Gets the <c>remote_command</c> value.</summary>
+    /// <summary>A remote command requested the abort.</summary>
     public static AbortReason RemoteCommand { get; } = new("remote_command");
 
-    /// <summary>Gets the <c>user_abort</c> value.</summary>
+    /// <summary>An MCP server delivered a user.abort notification.</summary>
     public static AbortReason UserAbort { get; } = new("user_abort");
 
     /// <summary>Returns a value indicating whether two <see cref="AbortReason"/> instances are equivalent.</summary>
@@ -6131,10 +6137,10 @@ public ToolExecutionCompleteContentResourceLinkIconTheme(string value)
     /// <summary>Gets the value associated with this <see cref="ToolExecutionCompleteContentResourceLinkIconTheme"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>light</c> value.</summary>
+    /// <summary>Icon intended for light themes.</summary>
     public static ToolExecutionCompleteContentResourceLinkIconTheme Light { get; } = new("light");
 
-    /// <summary>Gets the <c>dark</c> value.</summary>
+    /// <summary>Icon intended for dark themes.</summary>
     public static ToolExecutionCompleteContentResourceLinkIconTheme Dark { get; } = new("dark");
 
     /// <summary>Returns a value indicating whether two <see cref="ToolExecutionCompleteContentResourceLinkIconTheme"/> instances are equivalent.</summary>
@@ -6192,10 +6198,10 @@ public SystemMessageRole(string value)
     /// <summary>Gets the value associated with this <see cref="SystemMessageRole"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>system</c> value.</summary>
+    /// <summary>System prompt message.</summary>
     public static SystemMessageRole System { get; } = new("system");
 
-    /// <summary>Gets the <c>developer</c> value.</summary>
+    /// <summary>Developer instruction message.</summary>
     public static SystemMessageRole Developer { get; } = new("developer");
 
     /// <summary>Returns a value indicating whether two <see cref="SystemMessageRole"/> instances are equivalent.</summary>
@@ -6253,10 +6259,10 @@ public SystemNotificationAgentCompletedStatus(string value)
     /// <summary>Gets the value associated with this <see cref="SystemNotificationAgentCompletedStatus"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>completed</c> value.</summary>
+    /// <summary>The agent completed successfully.</summary>
     public static SystemNotificationAgentCompletedStatus Completed { get; } = new("completed");
 
-    /// <summary>Gets the <c>failed</c> value.</summary>
+    /// <summary>The agent failed.</summary>
     public static SystemNotificationAgentCompletedStatus Failed { get; } = new("failed");
 
     /// <summary>Returns a value indicating whether two <see cref="SystemNotificationAgentCompletedStatus"/> instances are equivalent.</summary>
@@ -6314,10 +6320,10 @@ public PermissionRequestMemoryAction(string value)
     /// <summary>Gets the value associated with this <see cref="PermissionRequestMemoryAction"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>store</c> value.</summary>
+    /// <summary>Store a new memory.</summary>
     public static PermissionRequestMemoryAction Store { get; } = new("store");
 
-    /// <summary>Gets the <c>vote</c> value.</summary>
+    /// <summary>Vote on an existing memory.</summary>
     public static PermissionRequestMemoryAction Vote { get; } = new("vote");
 
     /// <summary>Returns a value indicating whether two <see cref="PermissionRequestMemoryAction"/> instances are equivalent.</summary>
@@ -6375,10 +6381,10 @@ public PermissionRequestMemoryDirection(string value)
     /// <summary>Gets the value associated with this <see cref="PermissionRequestMemoryDirection"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>upvote</c> value.</summary>
+    /// <summary>Vote that the memory is useful or accurate.</summary>
     public static PermissionRequestMemoryDirection Upvote { get; } = new("upvote");
 
-    /// <summary>Gets the <c>downvote</c> value.</summary>
+    /// <summary>Vote that the memory is incorrect or outdated.</summary>
     public static PermissionRequestMemoryDirection Downvote { get; } = new("downvote");
 
     /// <summary>Returns a value indicating whether two <see cref="PermissionRequestMemoryDirection"/> instances are equivalent.</summary>
@@ -6436,13 +6442,13 @@ public PermissionPromptRequestPathAccessKind(string value)
     /// <summary>Gets the value associated with this <see cref="PermissionPromptRequestPathAccessKind"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>read</c> value.</summary>
+    /// <summary>Read access to a filesystem path.</summary>
     public static PermissionPromptRequestPathAccessKind Read { get; } = new("read");
 
-    /// <summary>Gets the <c>shell</c> value.</summary>
+    /// <summary>Shell command access involving a filesystem path.</summary>
     public static PermissionPromptRequestPathAccessKind Shell { get; } = new("shell");
 
-    /// <summary>Gets the <c>write</c> value.</summary>
+    /// <summary>Write access to a filesystem path.</summary>
     public static PermissionPromptRequestPathAccessKind Write { get; } = new("write");
 
     /// <summary>Returns a value indicating whether two <see cref="PermissionPromptRequestPathAccessKind"/> instances are equivalent.</summary>
@@ -6500,10 +6506,10 @@ public ElicitationRequestedMode(string value)
     /// <summary>Gets the value associated with this <see cref="ElicitationRequestedMode"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>form</c> value.</summary>
+    /// <summary>Structured form-based elicitation.</summary>
     public static ElicitationRequestedMode Form { get; } = new("form");
 
-    /// <summary>Gets the <c>url</c> value.</summary>
+    /// <summary>Browser URL-based elicitation.</summary>
     public static ElicitationRequestedMode Url { get; } = new("url");
 
     /// <summary>Returns a value indicating whether two <see cref="ElicitationRequestedMode"/> instances are equivalent.</summary>
@@ -6561,13 +6567,13 @@ public ElicitationCompletedAction(string value)
     /// <summary>Gets the value associated with this <see cref="ElicitationCompletedAction"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>accept</c> value.</summary>
+    /// <summary>The user submitted the requested form.</summary>
     public static ElicitationCompletedAction Accept { get; } = new("accept");
 
-    /// <summary>Gets the <c>decline</c> value.</summary>
+    /// <summary>The user explicitly declined the request.</summary>
     public static ElicitationCompletedAction Decline { get; } = new("decline");
 
-    /// <summary>Gets the <c>cancel</c> value.</summary>
+    /// <summary>The user dismissed the request.</summary>
     public static ElicitationCompletedAction Cancel { get; } = new("cancel");
 
     /// <summary>Returns a value indicating whether two <see cref="ElicitationCompletedAction"/> instances are equivalent.</summary>
@@ -6625,13 +6631,13 @@ public AutoModeSwitchResponse(string value)
     /// <summary>Gets the value associated with this <see cref="AutoModeSwitchResponse"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>yes</c> value.</summary>
+    /// <summary>Switch models for this request.</summary>
     public static AutoModeSwitchResponse Yes { get; } = new("yes");
 
-    /// <summary>Gets the <c>yes_always</c> value.</summary>
+    /// <summary>Switch models now and keep using the replacement automatically.</summary>
     public static AutoModeSwitchResponse YesAlways { get; } = new("yes_always");
 
-    /// <summary>Gets the <c>no</c> value.</summary>
+    /// <summary>Do not switch models.</summary>
     public static AutoModeSwitchResponse No { get; } = new("no");
 
     /// <summary>Returns a value indicating whether two <see cref="AutoModeSwitchResponse"/> instances are equivalent.</summary>
@@ -6689,16 +6695,16 @@ public ExitPlanModeAction(string value)
     /// <summary>Gets the value associated with this <see cref="ExitPlanModeAction"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>exit_only</c> value.</summary>
+    /// <summary>Exit plan mode without starting implementation.</summary>
     public static ExitPlanModeAction ExitOnly { get; } = new("exit_only");
 
-    /// <summary>Gets the <c>interactive</c> value.</summary>
+    /// <summary>Exit plan mode and continue in interactive mode.</summary>
     public static ExitPlanModeAction Interactive { get; } = new("interactive");
 
-    /// <summary>Gets the <c>autopilot</c> value.</summary>
+    /// <summary>Exit plan mode and continue autonomously.</summary>
     public static ExitPlanModeAction Autopilot { get; } = new("autopilot");
 
-    /// <summary>Gets the <c>autopilot_fleet</c> value.</summary>
+    /// <summary>Exit plan mode and continue with parallel autonomous workers.</summary>
     public static ExitPlanModeAction AutopilotFleet { get; } = new("autopilot_fleet");
 
     /// <summary>Returns a value indicating whether two <see cref="ExitPlanModeAction"/> instances are equivalent.</summary>
@@ -6756,25 +6762,25 @@ public SkillSource(string value)
     /// <summary>Gets the value associated with this <see cref="SkillSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>project</c> value.</summary>
+    /// <summary>Skill defined in the current project's skill directories.</summary>
     public static SkillSource Project { get; } = new("project");
 
-    /// <summary>Gets the <c>inherited</c> value.</summary>
+    /// <summary>Skill discovered from a parent directory in the current workspace tree.</summary>
     public static SkillSource Inherited { get; } = new("inherited");
 
-    /// <summary>Gets the <c>personal-copilot</c> value.</summary>
+    /// <summary>Skill defined in the user's Copilot skill directory.</summary>
     public static SkillSource PersonalCopilot { get; } = new("personal-copilot");
 
-    /// <summary>Gets the <c>personal-agents</c> value.</summary>
+    /// <summary>Skill defined in the user's personal agents skill directory.</summary>
     public static SkillSource PersonalAgents { get; } = new("personal-agents");
 
-    /// <summary>Gets the <c>plugin</c> value.</summary>
+    /// <summary>Skill provided by an installed plugin.</summary>
     public static SkillSource Plugin { get; } = new("plugin");
 
-    /// <summary>Gets the <c>custom</c> value.</summary>
+    /// <summary>Skill loaded from a configured custom skill directory.</summary>
     public static SkillSource Custom { get; } = new("custom");
 
-    /// <summary>Gets the <c>builtin</c> value.</summary>
+    /// <summary>Skill bundled with the runtime.</summary>
     public static SkillSource Builtin { get; } = new("builtin");
 
     /// <summary>Returns a value indicating whether two <see cref="SkillSource"/> instances are equivalent.</summary>
@@ -6832,16 +6838,16 @@ public McpServerSource(string value)
     /// <summary>Gets the value associated with this <see cref="McpServerSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>user</c> value.</summary>
+    /// <summary>Server configured in the user's global MCP configuration.</summary>
     public static McpServerSource User { get; } = new("user");
 
-    /// <summary>Gets the <c>workspace</c> value.</summary>
+    /// <summary>Server configured by the current workspace.</summary>
     public static McpServerSource Workspace { get; } = new("workspace");
 
-    /// <summary>Gets the <c>plugin</c> value.</summary>
+    /// <summary>Server contributed by an installed plugin.</summary>
     public static McpServerSource Plugin { get; } = new("plugin");
 
-    /// <summary>Gets the <c>builtin</c> value.</summary>
+    /// <summary>Server bundled with the runtime.</summary>
     public static McpServerSource Builtin { get; } = new("builtin");
 
     /// <summary>Returns a value indicating whether two <see cref="McpServerSource"/> instances are equivalent.</summary>
@@ -6899,22 +6905,22 @@ public McpServerStatus(string value)
     /// <summary>Gets the value associated with this <see cref="McpServerStatus"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>connected</c> value.</summary>
+    /// <summary>The server is connected and available.</summary>
     public static McpServerStatus Connected { get; } = new("connected");
 
-    /// <summary>Gets the <c>failed</c> value.</summary>
+    /// <summary>The server failed to connect or initialize.</summary>
     public static McpServerStatus Failed { get; } = new("failed");
 
-    /// <summary>Gets the <c>needs-auth</c> value.</summary>
+    /// <summary>The server requires authentication before it can connect.</summary>
     public static McpServerStatus NeedsAuth { get; } = new("needs-auth");
 
-    /// <summary>Gets the <c>pending</c> value.</summary>
+    /// <summary>The server connection is still being established.</summary>
     public static McpServerStatus Pending { get; } = new("pending");
 
-    /// <summary>Gets the <c>disabled</c> value.</summary>
+    /// <summary>The server is configured but disabled.</summary>
     public static McpServerStatus Disabled { get; } = new("disabled");
 
-    /// <summary>Gets the <c>not_configured</c> value.</summary>
+    /// <summary>The server is not configured for this session.</summary>
     public static McpServerStatus NotConfigured { get; } = new("not_configured");
 
     /// <summary>Returns a value indicating whether two <see cref="McpServerStatus"/> instances are equivalent.</summary>
@@ -6972,10 +6978,10 @@ public ExtensionsLoadedExtensionSource(string value)
     /// <summary>Gets the value associated with this <see cref="ExtensionsLoadedExtensionSource"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>project</c> value.</summary>
+    /// <summary>Extension discovered from the current project.</summary>
     public static ExtensionsLoadedExtensionSource Project { get; } = new("project");
 
-    /// <summary>Gets the <c>user</c> value.</summary>
+    /// <summary>Extension discovered from the user's extension directory.</summary>
     public static ExtensionsLoadedExtensionSource User { get; } = new("user");
 
     /// <summary>Returns a value indicating whether two <see cref="ExtensionsLoadedExtensionSource"/> instances are equivalent.</summary>
@@ -7033,16 +7039,16 @@ public ExtensionsLoadedExtensionStatus(string value)
     /// <summary>Gets the value associated with this <see cref="ExtensionsLoadedExtensionStatus"/>.</summary>
     public string Value => _value ?? string.Empty;
 
-    /// <summary>Gets the <c>running</c> value.</summary>
+    /// <summary>The extension process is running.</summary>
     public static ExtensionsLoadedExtensionStatus Running { get; } = new("running");
 
-    /// <summary>Gets the <c>disabled</c> value.</summary>
+    /// <summary>The extension is installed but disabled.</summary>
     public static ExtensionsLoadedExtensionStatus Disabled { get; } = new("disabled");
 
-    /// <summary>Gets the <c>failed</c> value.</summary>
+    /// <summary>The extension failed to start or crashed.</summary>
     public static ExtensionsLoadedExtensionStatus Failed { get; } = new("failed");
 
-    /// <summary>Gets the <c>starting</c> value.</summary>
+    /// <summary>The extension process is starting.</summary>
     public static ExtensionsLoadedExtensionStatus Starting { get; } = new("starting");
 
     /// <summary>Returns a value indicating whether two <see cref="ExtensionsLoadedExtensionStatus"/> instances are equivalent.</summary>
diff --git a/go/rpc/zrpc.go b/go/rpc/zrpc.go
index 510a31246..9a968c6f4 100644
--- a/go/rpc/zrpc.go
+++ b/go/rpc/zrpc.go
@@ -4102,6 +4102,24 @@ func (SlashCommandCompletedResult) Kind() SlashCommandInvocationResultKind {
 	return SlashCommandInvocationResultKindCompleted
 }
 
+// Schema for the `SlashCommandSelectSubcommandResult` type.
+type SlashCommandSelectSubcommandResult struct {
+	// Parent command name that requires subcommand selection
+	Command string `json:"command"`
+	// Available subcommand options for the client to present
+	Options []SlashCommandSelectSubcommandOption `json:"options"`
+	// True when the invocation mutated user runtime settings; consumers caching settings should
+	// refresh
+	RuntimeSettingsChanged *bool `json:"runtimeSettingsChanged,omitempty"`
+	// Human-readable title for the selection UI
+	Title string `json:"title"`
+}
+
+func (SlashCommandSelectSubcommandResult) slashCommandInvocationResult() {}
+func (SlashCommandSelectSubcommandResult) Kind() SlashCommandInvocationResultKind {
+	return SlashCommandInvocationResultKindSelectSubcommand
+}
+
 // Schema for the `SlashCommandTextResult` type.
 type SlashCommandTextResult struct {
 	// Whether text contains Markdown
@@ -4120,6 +4138,16 @@ func (SlashCommandTextResult) Kind() SlashCommandInvocationResultKind {
 	return SlashCommandInvocationResultKindText
 }
 
+// Schema for the `SlashCommandSelectSubcommandOption` type.
+type SlashCommandSelectSubcommandOption struct {
+	// Human-readable description of the subcommand
+	Description string `json:"description"`
+	// Optional group label for organizing options
+	Group *string `json:"group,omitempty"`
+	// Subcommand name to invoke
+	Name string `json:"name"`
+}
+
 // Schema for the `TaskAgentProgress` type.
 // Experimental: TaskAgentProgress is part of an experimental API and may change or be
 // removed.
@@ -5157,8 +5185,11 @@ type WorkspaceSummary struct {
 type AbortReason string
 
 const (
+	// A remote command requested the abort.
 	AbortReasonRemoteCommand AbortReason = "remote_command"
-	AbortReasonUserAbort     AbortReason = "user_abort"
+	// An MCP server delivered a user.abort notification.
+	AbortReasonUserAbort AbortReason = "user_abort"
+	// The local user requested the abort, for example by pressing Ctrl+C in the CLI.
 	AbortReasonUserInitiated AbortReason = "user_initiated"
 )
 
@@ -5167,12 +5198,18 @@ const (
 type AgentInfoSource string
 
 const (
-	AgentInfoSourceBuiltin   AgentInfoSource = "builtin"
+	// Agent built into the Copilot runtime.
+	AgentInfoSourceBuiltin AgentInfoSource = "builtin"
+	// Agent inherited from a parent project or workspace.
 	AgentInfoSourceInherited AgentInfoSource = "inherited"
-	AgentInfoSourcePlugin    AgentInfoSource = "plugin"
-	AgentInfoSourceProject   AgentInfoSource = "project"
-	AgentInfoSourceRemote    AgentInfoSource = "remote"
-	AgentInfoSourceUser      AgentInfoSource = "user"
+	// Agent contributed by an installed plugin.
+	AgentInfoSourcePlugin AgentInfoSource = "plugin"
+	// Agent loaded from the current project's repository configuration.
+	AgentInfoSourceProject AgentInfoSource = "project"
+	// Agent provided by a remote runtime or service.
+	AgentInfoSourceRemote AgentInfoSource = "remote"
+	// Agent loaded from the user's personal agent configuration.
+	AgentInfoSourceUser AgentInfoSource = "user"
 )
 
 // Type discriminator for AuthInfo.
@@ -5194,7 +5231,9 @@ const (
 type ConnectedRemoteSessionMetadataKind string
 
 const (
-	ConnectedRemoteSessionMetadataKindCodingAgent   ConnectedRemoteSessionMetadataKind = "coding-agent"
+	// GitHub Copilot coding agent session.
+	ConnectedRemoteSessionMetadataKindCodingAgent ConnectedRemoteSessionMetadataKind = "coding-agent"
+	// Remote CLI session.
 	ConnectedRemoteSessionMetadataKindRemoteSession ConnectedRemoteSessionMetadataKind = "remote-session"
 )
 
@@ -5204,9 +5243,12 @@ const (
 type ContentFilterMode string
 
 const (
+	// Remove characters that can hide directives.
 	ContentFilterModeHiddenCharacters ContentFilterMode = "hidden_characters"
-	ContentFilterModeMarkdown         ContentFilterMode = "markdown"
-	ContentFilterModeNone             ContentFilterMode = "none"
+	// Sanitize HTML while preserving Markdown-friendly output.
+	ContentFilterModeMarkdown ContentFilterMode = "markdown"
+	// Leave MCP tool result content unchanged.
+	ContentFilterModeNone ContentFilterMode = "none"
 )
 
 // Authentication host (always the public GitHub host).
@@ -5220,10 +5262,14 @@ const (
 type DiscoveredMcpServerType string
 
 const (
-	DiscoveredMcpServerTypeHTTP   DiscoveredMcpServerType = "http"
+	// Server communicates over streamable HTTP.
+	DiscoveredMcpServerTypeHTTP DiscoveredMcpServerType = "http"
+	// Server is backed by an in-memory runtime implementation.
 	DiscoveredMcpServerTypeMemory DiscoveredMcpServerType = "memory"
-	DiscoveredMcpServerTypeSse    DiscoveredMcpServerType = "sse"
-	DiscoveredMcpServerTypeStdio  DiscoveredMcpServerType = "stdio"
+	// Server communicates over Server-Sent Events.
+	DiscoveredMcpServerTypeSse DiscoveredMcpServerType = "sse"
+	// Server communicates over stdio with a local child process.
+	DiscoveredMcpServerTypeStdio DiscoveredMcpServerType = "stdio"
 )
 
 type EventLogTypesString string
@@ -5241,7 +5287,9 @@ const (
 type EventsAgentScope string
 
 const (
-	EventsAgentScopeAll     EventsAgentScope = "all"
+	// Return events from all agents.
+	EventsAgentScopeAll EventsAgentScope = "all"
+	// Return main-agent events and typed subagent lifecycle events.
 	EventsAgentScopePrimary EventsAgentScope = "primary"
 )
 
@@ -5253,8 +5301,10 @@ const (
 type EventsCursorStatus string
 
 const (
+	// The cursor referred to history that is no longer available.
 	EventsCursorStatusExpired EventsCursorStatus = "expired"
-	EventsCursorStatusOk      EventsCursorStatus = "ok"
+	// The cursor was applied successfully.
+	EventsCursorStatusOk EventsCursorStatus = "ok"
 )
 
 // Discovery source: project (.github/extensions/) or user (~/.copilot/extensions/)
@@ -5262,8 +5312,10 @@ const (
 type ExtensionSource string
 
 const (
+	// Extension discovered from the current project's .github/extensions directory.
 	ExtensionSourceProject ExtensionSource = "project"
-	ExtensionSourceUser    ExtensionSource = "user"
+	// Extension discovered from the user's ~/.copilot/extensions directory.
+	ExtensionSourceUser ExtensionSource = "user"
 )
 
 // Current status: running, disabled, failed, or starting
@@ -5271,9 +5323,13 @@ const (
 type ExtensionStatus string
 
 const (
+	// The extension is installed but disabled.
 	ExtensionStatusDisabled ExtensionStatus = "disabled"
-	ExtensionStatusFailed   ExtensionStatus = "failed"
-	ExtensionStatusRunning  ExtensionStatus = "running"
+	// The extension failed to start or crashed.
+	ExtensionStatusFailed ExtensionStatus = "failed"
+	// The extension process is running.
+	ExtensionStatusRunning ExtensionStatus = "running"
+	// The extension process is starting.
 	ExtensionStatusStarting ExtensionStatus = "starting"
 )
 
@@ -5282,7 +5338,9 @@ const (
 type ExternalToolTextResultForLlmBinaryResultsForLlmType string
 
 const (
-	ExternalToolTextResultForLlmBinaryResultsForLlmTypeImage    ExternalToolTextResultForLlmBinaryResultsForLlmType = "image"
+	// Binary image data.
+	ExternalToolTextResultForLlmBinaryResultsForLlmTypeImage ExternalToolTextResultForLlmBinaryResultsForLlmType = "image"
+	// Other binary resource data.
 	ExternalToolTextResultForLlmBinaryResultsForLlmTypeResource ExternalToolTextResultForLlmBinaryResultsForLlmType = "resource"
 )
 
@@ -5290,7 +5348,9 @@ const (
 type ExternalToolTextResultForLlmContentResourceLinkIconTheme string
 
 const (
-	ExternalToolTextResultForLlmContentResourceLinkIconThemeDark  ExternalToolTextResultForLlmContentResourceLinkIconTheme = "dark"
+	// Icon intended for dark themes.
+	ExternalToolTextResultForLlmContentResourceLinkIconThemeDark ExternalToolTextResultForLlmContentResourceLinkIconTheme = "dark"
+	// Icon intended for light themes.
 	ExternalToolTextResultForLlmContentResourceLinkIconThemeLight ExternalToolTextResultForLlmContentResourceLinkIconTheme = "light"
 )
 
@@ -5338,9 +5398,13 @@ const (
 type InstructionsSourcesLocation string
 
 const (
-	InstructionsSourcesLocationPlugin           InstructionsSourcesLocation = "plugin"
-	InstructionsSourcesLocationRepository       InstructionsSourcesLocation = "repository"
-	InstructionsSourcesLocationUser             InstructionsSourcesLocation = "user"
+	// Instructions live in plugin-provided configuration.
+	InstructionsSourcesLocationPlugin InstructionsSourcesLocation = "plugin"
+	// Instructions live in repository-level configuration.
+	InstructionsSourcesLocationRepository InstructionsSourcesLocation = "repository"
+	// Instructions live in user-level configuration.
+	InstructionsSourcesLocationUser InstructionsSourcesLocation = "user"
+	// Instructions live under the current working directory.
 	InstructionsSourcesLocationWorkingDirectory InstructionsSourcesLocation = "working-directory"
 )
 
@@ -5348,13 +5412,20 @@ const (
 type InstructionsSourcesType string
 
 const (
+	// Instructions inherited from child instruction files.
 	InstructionsSourcesTypeChildInstructions InstructionsSourcesType = "child-instructions"
-	InstructionsSourcesTypeHome              InstructionsSourcesType = "home"
-	InstructionsSourcesTypeModel             InstructionsSourcesType = "model"
-	InstructionsSourcesTypeNestedAgents      InstructionsSourcesType = "nested-agents"
-	InstructionsSourcesTypePlugin            InstructionsSourcesType = "plugin"
-	InstructionsSourcesTypeRepo              InstructionsSourcesType = "repo"
-	InstructionsSourcesTypeVscode            InstructionsSourcesType = "vscode"
+	// Instructions loaded from the user's home configuration.
+	InstructionsSourcesTypeHome InstructionsSourcesType = "home"
+	// Instructions loaded from model-specific files.
+	InstructionsSourcesTypeModel InstructionsSourcesType = "model"
+	// Instructions discovered from nested agent files.
+	InstructionsSourcesTypeNestedAgents InstructionsSourcesType = "nested-agents"
+	// Instructions supplied by an installed plugin.
+	InstructionsSourcesTypePlugin InstructionsSourcesType = "plugin"
+	// Instructions loaded from repository-scoped files.
+	InstructionsSourcesTypeRepo InstructionsSourcesType = "repo"
+	// Instructions loaded from VS Code instruction files.
+	InstructionsSourcesTypeVscode InstructionsSourcesType = "vscode"
 )
 
 // Outcome of the sampling inference. 'success' produced a response; 'failure' encountered
@@ -5365,16 +5436,21 @@ const (
 type McpSamplingExecutionAction string
 
 const (
+	// The sampling inference was cancelled before completion.
 	McpSamplingExecutionActionCancelled McpSamplingExecutionAction = "cancelled"
-	McpSamplingExecutionActionFailure   McpSamplingExecutionAction = "failure"
-	McpSamplingExecutionActionSuccess   McpSamplingExecutionAction = "success"
+	// The sampling inference failed or was rejected.
+	McpSamplingExecutionActionFailure McpSamplingExecutionAction = "failure"
+	// The sampling inference completed and produced a result.
+	McpSamplingExecutionActionSuccess McpSamplingExecutionAction = "success"
 )
 
 // OAuth grant type to use when authenticating to the remote MCP server.
 type McpServerConfigHTTPOauthGrantType string
 
 const (
+	// Interactive browser-based authorization code flow with PKCE.
 	McpServerConfigHTTPOauthGrantTypeAuthorizationCode McpServerConfigHTTPOauthGrantType = "authorization_code"
+	// Headless client credentials flow using the configured OAuth client.
 	McpServerConfigHTTPOauthGrantTypeClientCredentials McpServerConfigHTTPOauthGrantType = "client_credentials"
 )
 
@@ -5382,17 +5458,23 @@ const (
 type McpServerConfigHTTPType string
 
 const (
+	// Streamable HTTP transport.
 	McpServerConfigHTTPTypeHTTP McpServerConfigHTTPType = "http"
-	McpServerConfigHTTPTypeSse  McpServerConfigHTTPType = "sse"
+	// Server-Sent Events transport.
+	McpServerConfigHTTPTypeSse McpServerConfigHTTPType = "sse"
 )
 
 // Configuration source: user, workspace, plugin, or builtin
 type McpServerSource string
 
 const (
-	McpServerSourceBuiltin   McpServerSource = "builtin"
-	McpServerSourcePlugin    McpServerSource = "plugin"
-	McpServerSourceUser      McpServerSource = "user"
+	// Server bundled with the runtime.
+	McpServerSourceBuiltin McpServerSource = "builtin"
+	// Server contributed by an installed plugin.
+	McpServerSourcePlugin McpServerSource = "plugin"
+	// Server configured in the user's global MCP configuration.
+	McpServerSourceUser McpServerSource = "user"
+	// Server configured by the current workspace.
 	McpServerSourceWorkspace McpServerSource = "workspace"
 )
 
@@ -5401,12 +5483,18 @@ const (
 type McpServerStatus string
 
 const (
-	McpServerStatusConnected     McpServerStatus = "connected"
-	McpServerStatusDisabled      McpServerStatus = "disabled"
-	McpServerStatusFailed        McpServerStatus = "failed"
-	McpServerStatusNeedsAuth     McpServerStatus = "needs-auth"
+	// The server is connected and available.
+	McpServerStatusConnected McpServerStatus = "connected"
+	// The server is configured but disabled.
+	McpServerStatusDisabled McpServerStatus = "disabled"
+	// The server failed to connect or initialize.
+	McpServerStatusFailed McpServerStatus = "failed"
+	// The server requires authentication before it can connect.
+	McpServerStatusNeedsAuth McpServerStatus = "needs-auth"
+	// The server is not configured for this session.
 	McpServerStatusNotConfigured McpServerStatus = "not_configured"
-	McpServerStatusPending       McpServerStatus = "pending"
+	// The server connection is still being established.
+	McpServerStatusPending McpServerStatus = "pending"
 )
 
 // How environment-variable values supplied to MCP servers are resolved. "direct" passes
@@ -5419,7 +5507,9 @@ const (
 type McpSetEnvValueModeDetails string
 
 const (
-	McpSetEnvValueModeDetailsDirect   McpSetEnvValueModeDetails = "direct"
+	// Treat MCP server environment values as literal strings.
+	McpSetEnvValueModeDetailsDirect McpSetEnvValueModeDetails = "direct"
+	// Treat MCP server environment values as host-side references to resolve before launch.
 	McpSetEnvValueModeDetailsIndirect McpSetEnvValueModeDetails = "indirect"
 )
 
@@ -5429,9 +5519,12 @@ const (
 type MetadataSnapshotCurrentMode string
 
 const (
-	MetadataSnapshotCurrentModeAutopilot   MetadataSnapshotCurrentMode = "autopilot"
+	// The agent is working autonomously toward task completion.
+	MetadataSnapshotCurrentModeAutopilot MetadataSnapshotCurrentMode = "autopilot"
+	// The agent is responding interactively to the user.
 	MetadataSnapshotCurrentModeInteractive MetadataSnapshotCurrentMode = "interactive"
-	MetadataSnapshotCurrentModePlan        MetadataSnapshotCurrentMode = "plan"
+	// The agent is preparing a plan before making changes.
+	MetadataSnapshotCurrentModePlan MetadataSnapshotCurrentMode = "plan"
 )
 
 // Whether the remote task originated from Copilot Coding Agent (cca) or a CLI `--remote`
@@ -5441,7 +5534,9 @@ const (
 type MetadataSnapshotRemoteMetadataTaskType string
 
 const (
+	// Remote task originated from Copilot Coding Agent.
 	MetadataSnapshotRemoteMetadataTaskTypeCca MetadataSnapshotRemoteMetadataTaskType = "cca"
+	// Remote task originated from a CLI remote-session invocation.
 	MetadataSnapshotRemoteMetadataTaskTypeCli MetadataSnapshotRemoteMetadataTaskType = "cli"
 )
 
@@ -5449,18 +5544,25 @@ const (
 type ModelPickerCategory string
 
 const (
+	// Lightweight model category optimized for faster, lower-cost interactions.
 	ModelPickerCategoryLightweight ModelPickerCategory = "lightweight"
-	ModelPickerCategoryPowerful    ModelPickerCategory = "powerful"
-	ModelPickerCategoryVersatile   ModelPickerCategory = "versatile"
+	// Powerful model category optimized for complex tasks.
+	ModelPickerCategoryPowerful ModelPickerCategory = "powerful"
+	// Versatile model category suitable for a broad range of tasks.
+	ModelPickerCategoryVersatile ModelPickerCategory = "versatile"
 )
 
 // Relative cost tier for token-based billing users
 type ModelPickerPriceCategory string
 
 const (
-	ModelPickerPriceCategoryHigh     ModelPickerPriceCategory = "high"
-	ModelPickerPriceCategoryLow      ModelPickerPriceCategory = "low"
-	ModelPickerPriceCategoryMedium   ModelPickerPriceCategory = "medium"
+	// High relative token cost tier.
+	ModelPickerPriceCategoryHigh ModelPickerPriceCategory = "high"
+	// Lowest relative token cost tier.
+	ModelPickerPriceCategoryLow ModelPickerPriceCategory = "low"
+	// Medium relative token cost tier.
+	ModelPickerPriceCategoryMedium ModelPickerPriceCategory = "medium"
+	// Highest relative token cost tier.
 	ModelPickerPriceCategoryVeryHigh ModelPickerPriceCategory = "very_high"
 )
 
@@ -5468,8 +5570,11 @@ const (
 type ModelPolicyState string
 
 const (
-	ModelPolicyStateDisabled     ModelPolicyState = "disabled"
-	ModelPolicyStateEnabled      ModelPolicyState = "enabled"
+	// The model is disabled by policy.
+	ModelPolicyStateDisabled ModelPolicyState = "disabled"
+	// The model is enabled by policy.
+	ModelPolicyStateEnabled ModelPolicyState = "enabled"
+	// No explicit policy is configured for the model.
 	ModelPolicyStateUnconfigured ModelPolicyState = "unconfigured"
 )
 
@@ -5480,7 +5585,9 @@ const (
 type OptionsUpdateEnvValueMode string
 
 const (
-	OptionsUpdateEnvValueModeDirect   OptionsUpdateEnvValueMode = "direct"
+	// Pass MCP server environment values as literal strings.
+	OptionsUpdateEnvValueModeDirect OptionsUpdateEnvValueMode = "direct"
+	// Resolve MCP server environment values from host-side references.
 	OptionsUpdateEnvValueModeIndirect OptionsUpdateEnvValueMode = "indirect"
 )
 
@@ -5540,7 +5647,9 @@ const (
 type PermissionsConfigureAdditionalContentExclusionPolicyScope string
 
 const (
-	PermissionsConfigureAdditionalContentExclusionPolicyScopeAll  PermissionsConfigureAdditionalContentExclusionPolicyScope = "all"
+	// The content exclusion policy applies across all repositories.
+	PermissionsConfigureAdditionalContentExclusionPolicyScopeAll PermissionsConfigureAdditionalContentExclusionPolicyScope = "all"
+	// The content exclusion policy applies to the current repository.
 	PermissionsConfigureAdditionalContentExclusionPolicyScopeRepo PermissionsConfigureAdditionalContentExclusionPolicyScope = "repo"
 )
 
@@ -5549,18 +5658,24 @@ const (
 type PermissionsModifyRulesScope string
 
 const (
+	// Persist the rule change for this project location.
 	PermissionsModifyRulesScopeLocation PermissionsModifyRulesScope = "location"
-	PermissionsModifyRulesScopeSession  PermissionsModifyRulesScope = "session"
+	// Apply the rule change only to this session.
+	PermissionsModifyRulesScopeSession PermissionsModifyRulesScope = "session"
 )
 
 // Optional source for allow-all telemetry. Defaults to `rpc` when omitted for SDK callers.
 type PermissionsSetApproveAllSource string
 
 const (
+	// Allow-all was enabled by confirming autopilot behavior.
 	PermissionsSetApproveAllSourceAutopilotConfirmation PermissionsSetApproveAllSource = "autopilot_confirmation"
-	PermissionsSetApproveAllSourceCliFlag               PermissionsSetApproveAllSource = "cli_flag"
-	PermissionsSetApproveAllSourceRPC                   PermissionsSetApproveAllSource = "rpc"
-	PermissionsSetApproveAllSourceSlashCommand          PermissionsSetApproveAllSource = "slash_command"
+	// Allow-all was enabled from a CLI command-line flag.
+	PermissionsSetApproveAllSourceCliFlag PermissionsSetApproveAllSource = "cli_flag"
+	// Allow-all was enabled through an RPC caller.
+	PermissionsSetApproveAllSourceRPC PermissionsSetApproveAllSource = "rpc"
+	// Allow-all was enabled by a slash command.
+	PermissionsSetApproveAllSourceSlashCommand PermissionsSetApproveAllSource = "slash_command"
 )
 
 // Whether this item is a queued user message or a queued slash command / model change
@@ -5569,7 +5684,9 @@ const (
 type QueuePendingItemsKind string
 
 const (
+	// A queued slash command or model-change command.
 	QueuePendingItemsKindCommand QueuePendingItemsKind = "command"
+	// A queued user message.
 	QueuePendingItemsKindMessage QueuePendingItemsKind = "message"
 )
 
@@ -5577,9 +5694,12 @@ const (
 type ReasoningSummary string
 
 const (
-	ReasoningSummaryConcise  ReasoningSummary = "concise"
+	// Request a concise summary of the model's reasoning.
+	ReasoningSummaryConcise ReasoningSummary = "concise"
+	// Request a detailed summary of the model's reasoning.
 	ReasoningSummaryDetailed ReasoningSummary = "detailed"
-	ReasoningSummaryNone     ReasoningSummary = "none"
+	// Do not request reasoning summaries from the model.
+	ReasoningSummaryNone ReasoningSummary = "none"
 )
 
 // Per-session remote mode. "off" disables remote, "export" exports session events to GitHub
@@ -5589,9 +5709,12 @@ const (
 type RemoteSessionMode string
 
 const (
+	// Export session events to GitHub without enabling remote steering.
 	RemoteSessionModeExport RemoteSessionMode = "export"
-	RemoteSessionModeOff    RemoteSessionMode = "off"
-	RemoteSessionModeOn     RemoteSessionMode = "on"
+	// Disable remote session export and steering.
+	RemoteSessionModeOff RemoteSessionMode = "off"
+	// Enable both remote session export and remote steering.
+	RemoteSessionModeOn RemoteSessionMode = "on"
 )
 
 // The UI mode the agent was in when this message was sent. Defaults to the session's
@@ -5599,19 +5722,26 @@ const (
 type SendAgentMode string
 
 const (
-	SendAgentModeAutopilot   SendAgentMode = "autopilot"
+	// The agent is working autonomously toward task completion.
+	SendAgentModeAutopilot SendAgentMode = "autopilot"
+	// The agent is responding interactively to the user.
 	SendAgentModeInteractive SendAgentMode = "interactive"
-	SendAgentModePlan        SendAgentMode = "plan"
-	SendAgentModeShell       SendAgentMode = "shell"
+	// The agent is preparing a plan before making changes.
+	SendAgentModePlan SendAgentMode = "plan"
+	// The agent is in shell-focused UI mode.
+	SendAgentModeShell SendAgentMode = "shell"
 )
 
 // Type of GitHub reference
 type SendAttachmentGithubReferenceType string
 
 const (
+	// GitHub discussion reference.
 	SendAttachmentGithubReferenceTypeDiscussion SendAttachmentGithubReferenceType = "discussion"
-	SendAttachmentGithubReferenceTypeIssue      SendAttachmentGithubReferenceType = "issue"
-	SendAttachmentGithubReferenceTypePr         SendAttachmentGithubReferenceType = "pr"
+	// GitHub issue reference.
+	SendAttachmentGithubReferenceTypeIssue SendAttachmentGithubReferenceType = "issue"
+	// GitHub pull request reference.
+	SendAttachmentGithubReferenceTypePr SendAttachmentGithubReferenceType = "pr"
 )
 
 // Type discriminator for SendAttachment.
@@ -5630,7 +5760,9 @@ const (
 type SendMode string
 
 const (
-	SendModeEnqueue   SendMode = "enqueue"
+	// Append the message to the normal session queue.
+	SendModeEnqueue SendMode = "enqueue"
+	// Interject the message during the in-progress turn.
 	SendModeImmediate SendMode = "immediate"
 )
 
@@ -5640,7 +5772,9 @@ const (
 type SessionContextHostType string
 
 const (
-	SessionContextHostTypeAdo    SessionContextHostType = "ado"
+	// Session repository is hosted on Azure DevOps.
+	SessionContextHostTypeAdo SessionContextHostType = "ado"
+	// Session repository is hosted on GitHub.
 	SessionContextHostTypeGithub SessionContextHostType = "github"
 )
 
@@ -5648,7 +5782,9 @@ const (
 type SessionFsErrorCode string
 
 const (
-	SessionFsErrorCodeENOENT  SessionFsErrorCode = "ENOENT"
+	// The requested path does not exist.
+	SessionFsErrorCodeENOENT SessionFsErrorCode = "ENOENT"
+	// The filesystem operation failed for an unspecified reason.
 	SessionFsErrorCodeUNKNOWN SessionFsErrorCode = "UNKNOWN"
 )
 
@@ -5656,15 +5792,19 @@ const (
 type SessionFsReaddirWithTypesEntryType string
 
 const (
+	// The entry is a directory.
 	SessionFsReaddirWithTypesEntryTypeDirectory SessionFsReaddirWithTypesEntryType = "directory"
-	SessionFsReaddirWithTypesEntryTypeFile      SessionFsReaddirWithTypesEntryType = "file"
+	// The entry is a file.
+	SessionFsReaddirWithTypesEntryTypeFile SessionFsReaddirWithTypesEntryType = "file"
 )
 
 // Path conventions used by this filesystem
 type SessionFsSetProviderConventions string
 
 const (
-	SessionFsSetProviderConventionsPosix   SessionFsSetProviderConventions = "posix"
+	// Paths use POSIX path conventions.
+	SessionFsSetProviderConventionsPosix SessionFsSetProviderConventions = "posix"
+	// Paths use Windows path conventions.
 	SessionFsSetProviderConventionsWindows SessionFsSetProviderConventions = "windows"
 )
 
@@ -5673,9 +5813,12 @@ const (
 type SessionFsSqliteQueryType string
 
 const (
-	SessionFsSqliteQueryTypeExec  SessionFsSqliteQueryType = "exec"
+	// Execute DDL or multi-statement SQL without returning rows.
+	SessionFsSqliteQueryTypeExec SessionFsSqliteQueryType = "exec"
+	// Execute a SELECT-style query and return rows.
 	SessionFsSqliteQueryTypeQuery SessionFsSqliteQueryType = "query"
-	SessionFsSqliteQueryTypeRun   SessionFsSqliteQueryType = "run"
+	// Execute INSERT, UPDATE, or DELETE SQL and return affected-row metadata.
+	SessionFsSqliteQueryTypeRun SessionFsSqliteQueryType = "run"
 )
 
 // Constant value. Always "github".
@@ -5704,8 +5847,11 @@ const (
 type SessionLogLevel string
 
 const (
-	SessionLogLevelError   SessionLogLevel = "error"
-	SessionLogLevelInfo    SessionLogLevel = "info"
+	// Error message describing a failure.
+	SessionLogLevelError SessionLogLevel = "error"
+	// Informational message.
+	SessionLogLevelInfo SessionLogLevel = "info"
+	// Warning message that may require attention.
 	SessionLogLevelWarning SessionLogLevel = "warning"
 )
 
@@ -5713,9 +5859,12 @@ const (
 type SessionMode string
 
 const (
-	SessionModeAutopilot   SessionMode = "autopilot"
+	// The agent is working autonomously toward task completion.
+	SessionModeAutopilot SessionMode = "autopilot"
+	// The agent is responding interactively to the user.
 	SessionModeInteractive SessionMode = "interactive"
-	SessionModePlan        SessionMode = "plan"
+	// The agent is preparing a plan before making changes.
+	SessionModePlan SessionMode = "plan"
 )
 
 // Hosting platform type of the repository
@@ -5724,7 +5873,9 @@ const (
 type SessionWorkingDirectoryContextHostType string
 
 const (
-	SessionWorkingDirectoryContextHostTypeAdo    SessionWorkingDirectoryContextHostType = "ado"
+	// The working directory repository is hosted on Azure DevOps.
+	SessionWorkingDirectoryContextHostTypeAdo SessionWorkingDirectoryContextHostType = "ado"
+	// The working directory repository is hosted on GitHub.
 	SessionWorkingDirectoryContextHostTypeGithub SessionWorkingDirectoryContextHostType = "github"
 )
 
@@ -5732,8 +5883,11 @@ const (
 type ShellKillSignal string
 
 const (
-	ShellKillSignalSIGINT  ShellKillSignal = "SIGINT"
+	// Send an interrupt signal to the process.
+	ShellKillSignalSIGINT ShellKillSignal = "SIGINT"
+	// Forcefully terminate the process.
 	ShellKillSignalSIGKILL ShellKillSignal = "SIGKILL"
+	// Request graceful process termination.
 	ShellKillSignalSIGTERM ShellKillSignal = "SIGTERM"
 )
 
@@ -5741,7 +5895,9 @@ const (
 type ShutdownType string
 
 const (
-	ShutdownTypeError   ShutdownType = "error"
+	// The session is shutting down because of an error.
+	ShutdownTypeError ShutdownType = "error"
+	// The session is shutting down normally.
 	ShutdownTypeRoutine ShutdownType = "routine"
 )
 
@@ -5749,19 +5905,27 @@ const (
 type SkillSource string
 
 const (
-	SkillSourceBuiltin         SkillSource = "builtin"
-	SkillSourceCustom          SkillSource = "custom"
-	SkillSourceInherited       SkillSource = "inherited"
-	SkillSourcePersonalAgents  SkillSource = "personal-agents"
+	// Skill bundled with the runtime.
+	SkillSourceBuiltin SkillSource = "builtin"
+	// Skill loaded from a configured custom skill directory.
+	SkillSourceCustom SkillSource = "custom"
+	// Skill discovered from a parent directory in the current workspace tree.
+	SkillSourceInherited SkillSource = "inherited"
+	// Skill defined in the user's personal agents skill directory.
+	SkillSourcePersonalAgents SkillSource = "personal-agents"
+	// Skill defined in the user's Copilot skill directory.
 	SkillSourcePersonalCopilot SkillSource = "personal-copilot"
-	SkillSourcePlugin          SkillSource = "plugin"
-	SkillSourceProject         SkillSource = "project"
+	// Skill provided by an installed plugin.
+	SkillSourcePlugin SkillSource = "plugin"
+	// Skill defined in the current project's skill directories.
+	SkillSourceProject SkillSource = "project"
 )
 
 // Optional completion hint for the input (e.g. 'directory' for filesystem path completion)
 type SlashCommandInputCompletion string
 
 const (
+	// Input should complete filesystem directories.
 	SlashCommandInputCompletionDirectory SlashCommandInputCompletion = "directory"
 )
 
@@ -5769,9 +5933,10 @@ const (
 type SlashCommandInvocationResultKind string
 
 const (
-	SlashCommandInvocationResultKindAgentPrompt SlashCommandInvocationResultKind = "agent-prompt"
-	SlashCommandInvocationResultKindCompleted   SlashCommandInvocationResultKind = "completed"
-	SlashCommandInvocationResultKindText        SlashCommandInvocationResultKind = "text"
+	SlashCommandInvocationResultKindAgentPrompt      SlashCommandInvocationResultKind = "agent-prompt"
+	SlashCommandInvocationResultKindCompleted        SlashCommandInvocationResultKind = "completed"
+	SlashCommandInvocationResultKindSelectSubcommand SlashCommandInvocationResultKind = "select-subcommand"
+	SlashCommandInvocationResultKindText             SlashCommandInvocationResultKind = "text"
 )
 
 // Coarse command category for grouping and behavior: runtime built-in, skill-backed
@@ -5779,9 +5944,12 @@ const (
 type SlashCommandKind string
 
 const (
+	// Command implemented by the runtime.
 	SlashCommandKindBuiltin SlashCommandKind = "builtin"
-	SlashCommandKindClient  SlashCommandKind = "client"
-	SlashCommandKindSkill   SlashCommandKind = "skill"
+	// Command registered by an SDK client or extension.
+	SlashCommandKindClient SlashCommandKind = "client"
+	// Command backed by a skill.
+	SlashCommandKindSkill SlashCommandKind = "skill"
 )
 
 // Type discriminator for TaskAgentProgress.
@@ -5798,8 +5966,10 @@ const (
 type TaskExecutionMode string
 
 const (
+	// The task is managed in the background.
 	TaskExecutionModeBackground TaskExecutionMode = "background"
-	TaskExecutionModeSync       TaskExecutionMode = "sync"
+	// The task was started with synchronous waiting.
+	TaskExecutionModeSync TaskExecutionMode = "sync"
 )
 
 // Type discriminator for TaskInfo.
@@ -5817,7 +5987,9 @@ const (
 type TaskShellInfoAttachmentMode string
 
 const (
+	// The shell runs in a managed PTY session.
 	TaskShellInfoAttachmentModeAttached TaskShellInfoAttachmentMode = "attached"
+	// The shell runs as an independent background process.
 	TaskShellInfoAttachmentModeDetached TaskShellInfoAttachmentMode = "detached"
 )
 
@@ -5826,11 +5998,16 @@ const (
 type TaskStatus string
 
 const (
+	// The task was cancelled before completion.
 	TaskStatusCancelled TaskStatus = "cancelled"
+	// The task finished successfully.
 	TaskStatusCompleted TaskStatus = "completed"
-	TaskStatusFailed    TaskStatus = "failed"
-	TaskStatusIdle      TaskStatus = "idle"
-	TaskStatusRunning   TaskStatus = "running"
+	// The task finished with an error.
+	TaskStatusFailed TaskStatus = "failed"
+	// The task is waiting for additional input.
+	TaskStatusIdle TaskStatus = "idle"
+	// The task is actively executing.
+	TaskStatusRunning TaskStatus = "running"
 )
 
 // User's choice for auto-mode switching: yes (allow this turn), yes_always (allow + persist
@@ -5838,8 +6015,11 @@ const (
 type UIAutoModeSwitchResponse string
 
 const (
-	UIAutoModeSwitchResponseNo        UIAutoModeSwitchResponse = "no"
-	UIAutoModeSwitchResponseYes       UIAutoModeSwitchResponse = "yes"
+	// Decline the automatic mode switch.
+	UIAutoModeSwitchResponseNo UIAutoModeSwitchResponse = "no"
+	// Allow the automatic mode switch for this turn.
+	UIAutoModeSwitchResponseYes UIAutoModeSwitchResponse = "yes"
+	// Allow this mode switch and persist the preference.
 	UIAutoModeSwitchResponseYesAlways UIAutoModeSwitchResponse = "yes_always"
 )
 
@@ -5854,8 +6034,11 @@ const (
 type UIElicitationResponseAction string
 
 const (
-	UIElicitationResponseActionAccept  UIElicitationResponseAction = "accept"
-	UIElicitationResponseActionCancel  UIElicitationResponseAction = "cancel"
+	// The user submitted the requested form values.
+	UIElicitationResponseActionAccept UIElicitationResponseAction = "accept"
+	// The user dismissed the elicitation request.
+	UIElicitationResponseActionCancel UIElicitationResponseAction = "cancel"
+	// The user explicitly declined to provide the requested input.
 	UIElicitationResponseActionDecline UIElicitationResponseAction = "decline"
 )
 
@@ -5863,18 +6046,24 @@ const (
 type UIElicitationSchemaPropertyNumberType string
 
 const (
+	// Integer JSON number.
 	UIElicitationSchemaPropertyNumberTypeInteger UIElicitationSchemaPropertyNumberType = "integer"
-	UIElicitationSchemaPropertyNumberTypeNumber  UIElicitationSchemaPropertyNumberType = "number"
+	// Any JSON number.
+	UIElicitationSchemaPropertyNumberTypeNumber UIElicitationSchemaPropertyNumberType = "number"
 )
 
 // Optional format hint that constrains the accepted input.
 type UIElicitationSchemaPropertyStringFormat string
 
 const (
-	UIElicitationSchemaPropertyStringFormatDate     UIElicitationSchemaPropertyStringFormat = "date"
+	// Calendar date string format.
+	UIElicitationSchemaPropertyStringFormatDate UIElicitationSchemaPropertyStringFormat = "date"
+	// Date-time string format.
 	UIElicitationSchemaPropertyStringFormatDateTime UIElicitationSchemaPropertyStringFormat = "date-time"
-	UIElicitationSchemaPropertyStringFormatEmail    UIElicitationSchemaPropertyStringFormat = "email"
-	UIElicitationSchemaPropertyStringFormatURI      UIElicitationSchemaPropertyStringFormat = "uri"
+	// Email address string format.
+	UIElicitationSchemaPropertyStringFormatEmail UIElicitationSchemaPropertyStringFormat = "email"
+	// URI string format.
+	UIElicitationSchemaPropertyStringFormatURI UIElicitationSchemaPropertyStringFormat = "uri"
 )
 
 // Type discriminator for UIElicitationSchemaProperty.
@@ -5900,10 +6089,14 @@ const (
 type UIExitPlanModeAction string
 
 const (
-	UIExitPlanModeActionAutopilot      UIExitPlanModeAction = "autopilot"
+	// Exit plan mode and continue in autopilot mode.
+	UIExitPlanModeActionAutopilot UIExitPlanModeAction = "autopilot"
+	// Exit plan mode and continue in autopilot mode with parallel subagent execution.
 	UIExitPlanModeActionAutopilotFleet UIExitPlanModeAction = "autopilot_fleet"
-	UIExitPlanModeActionExitOnly       UIExitPlanModeAction = "exit_only"
-	UIExitPlanModeActionInteractive    UIExitPlanModeAction = "interactive"
+	// Exit plan mode without starting implementation.
+	UIExitPlanModeActionExitOnly UIExitPlanModeAction = "exit_only"
+	// Exit plan mode and continue interactively.
+	UIExitPlanModeActionInteractive UIExitPlanModeAction = "interactive"
 )
 
 // Kind discriminator for UserToolSessionApproval.
@@ -5923,7 +6116,9 @@ const (
 type WorkspacesGetWorkspaceResultWorkspaceHostType string
 
 const (
-	WorkspacesGetWorkspaceResultWorkspaceHostTypeAdo    WorkspacesGetWorkspaceResultWorkspaceHostType = "ado"
+	// Workspace repository is hosted on Azure DevOps.
+	WorkspacesGetWorkspaceResultWorkspaceHostTypeAdo WorkspacesGetWorkspaceResultWorkspaceHostType = "ado"
+	// Workspace repository is hosted on GitHub.
 	WorkspacesGetWorkspaceResultWorkspaceHostTypeGithub WorkspacesGetWorkspaceResultWorkspaceHostType = "github"
 )
 
@@ -5931,7 +6126,9 @@ const (
 type WorkspaceSummaryHostType string
 
 const (
-	WorkspaceSummaryHostTypeAdo    WorkspaceSummaryHostType = "ado"
+	// Workspace summary repository is hosted on Azure DevOps.
+	WorkspaceSummaryHostTypeAdo WorkspaceSummaryHostType = "ado"
+	// Workspace summary repository is hosted on GitHub.
 	WorkspaceSummaryHostTypeGithub WorkspaceSummaryHostType = "github"
 )
 
diff --git a/go/rpc/zrpc_encoding.go b/go/rpc/zrpc_encoding.go
index a0e0da3e0..87ea266a2 100644
--- a/go/rpc/zrpc_encoding.go
+++ b/go/rpc/zrpc_encoding.go
@@ -1964,6 +1964,12 @@ func unmarshalSlashCommandInvocationResult(data []byte) (SlashCommandInvocationR
 			return nil, err
 		}
 		return &d, nil
+	case SlashCommandInvocationResultKindSelectSubcommand:
+		var d SlashCommandSelectSubcommandResult
+		if err := json.Unmarshal(data, &d); err != nil {
+			return nil, err
+		}
+		return &d, nil
 	case SlashCommandInvocationResultKindText:
 		var d SlashCommandTextResult
 		if err := json.Unmarshal(data, &d); err != nil {
@@ -2008,6 +2014,17 @@ func (r SlashCommandCompletedResult) MarshalJSON() ([]byte, error) {
 	})
 }
 
+func (r SlashCommandSelectSubcommandResult) MarshalJSON() ([]byte, error) {
+	type alias SlashCommandSelectSubcommandResult
+	return json.Marshal(struct {
+		Kind SlashCommandInvocationResultKind `json:"kind"`
+		alias
+	}{
+		Kind:  r.Kind(),
+		alias: alias(r),
+	})
+}
+
 func (r SlashCommandTextResult) MarshalJSON() ([]byte, error) {
 	type alias SlashCommandTextResult
 	return json.Marshal(struct {
diff --git a/go/rpc/zsession_events.go b/go/rpc/zsession_events.go
index 93ae9f476..568794119 100644
--- a/go/rpc/zsession_events.go
+++ b/go/rpc/zsession_events.go
@@ -557,7 +557,7 @@ type AssistantUsageData struct {
 	// Number of output tokens used for reasoning (e.g., chain-of-thought)
 	ReasoningTokens *int64 `json:"reasoningTokens,omitempty"`
 	// Time to first token in milliseconds. Only available for streaming requests
-	TtftMs *int64 `json:"ttftMs,omitempty"`
+	TimeToFirstTokenMs *int64 `json:"timeToFirstTokenMs,omitempty"`
 }
 
 func (*AssistantUsageData) sessionEventData()      {}
@@ -2689,7 +2689,9 @@ type WorkingDirectoryContext struct {
 type AssistantMessageToolRequestType string
 
 const (
-	AssistantMessageToolRequestTypeCustom   AssistantMessageToolRequestType = "custom"
+	// Custom grammar-based tool call.
+	AssistantMessageToolRequestTypeCustom AssistantMessageToolRequestType = "custom"
+	// Standard function-style tool call.
 	AssistantMessageToolRequestTypeFunction AssistantMessageToolRequestType = "function"
 )
 
@@ -2697,18 +2699,25 @@ const (
 type AssistantUsageAPIEndpoint string
 
 const (
+	// Chat Completions API endpoint.
 	AssistantUsageAPIEndpointChatCompletions AssistantUsageAPIEndpoint = "/chat/completions"
-	AssistantUsageAPIEndpointResponses       AssistantUsageAPIEndpoint = "/responses"
-	AssistantUsageAPIEndpointV1Messages      AssistantUsageAPIEndpoint = "/v1/messages"
-	AssistantUsageAPIEndpointWsResponses     AssistantUsageAPIEndpoint = "ws:/responses"
+	// Responses API endpoint.
+	AssistantUsageAPIEndpointResponses AssistantUsageAPIEndpoint = "/responses"
+	// Anthropic Messages API endpoint.
+	AssistantUsageAPIEndpointV1Messages AssistantUsageAPIEndpoint = "/v1/messages"
+	// WebSocket Responses API endpoint.
+	AssistantUsageAPIEndpointWsResponses AssistantUsageAPIEndpoint = "ws:/responses"
 )
 
 // The user's auto-mode-switch choice
 type AutoModeSwitchResponse string
 
 const (
-	AutoModeSwitchResponseNo        AutoModeSwitchResponse = "no"
-	AutoModeSwitchResponseYes       AutoModeSwitchResponse = "yes"
+	// Do not switch models.
+	AutoModeSwitchResponseNo AutoModeSwitchResponse = "no"
+	// Switch models for this request.
+	AutoModeSwitchResponseYes AutoModeSwitchResponse = "yes"
+	// Switch models now and keep using the replacement automatically.
 	AutoModeSwitchResponseYesAlways AutoModeSwitchResponse = "yes_always"
 )
 
@@ -2716,8 +2725,11 @@ const (
 type ElicitationCompletedAction string
 
 const (
-	ElicitationCompletedActionAccept  ElicitationCompletedAction = "accept"
-	ElicitationCompletedActionCancel  ElicitationCompletedAction = "cancel"
+	// The user submitted the requested form.
+	ElicitationCompletedActionAccept ElicitationCompletedAction = "accept"
+	// The user dismissed the request.
+	ElicitationCompletedActionCancel ElicitationCompletedAction = "cancel"
+	// The user explicitly declined the request.
 	ElicitationCompletedActionDecline ElicitationCompletedAction = "decline"
 )
 
@@ -2725,8 +2737,10 @@ const (
 type ElicitationRequestedMode string
 
 const (
+	// Structured form-based elicitation.
 	ElicitationRequestedModeForm ElicitationRequestedMode = "form"
-	ElicitationRequestedModeURL  ElicitationRequestedMode = "url"
+	// Browser URL-based elicitation.
+	ElicitationRequestedModeURL ElicitationRequestedMode = "url"
 )
 
 // Schema type indicator (always 'object')
@@ -2740,27 +2754,37 @@ const (
 type ExitPlanModeAction string
 
 const (
-	ExitPlanModeActionAutopilot      ExitPlanModeAction = "autopilot"
+	// Exit plan mode and continue autonomously.
+	ExitPlanModeActionAutopilot ExitPlanModeAction = "autopilot"
+	// Exit plan mode and continue with parallel autonomous workers.
 	ExitPlanModeActionAutopilotFleet ExitPlanModeAction = "autopilot_fleet"
-	ExitPlanModeActionExitOnly       ExitPlanModeAction = "exit_only"
-	ExitPlanModeActionInteractive    ExitPlanModeAction = "interactive"
+	// Exit plan mode without starting implementation.
+	ExitPlanModeActionExitOnly ExitPlanModeAction = "exit_only"
+	// Exit plan mode and continue in interactive mode.
+	ExitPlanModeActionInteractive ExitPlanModeAction = "interactive"
 )
 
 // Discovery source
 type ExtensionsLoadedExtensionSource string
 
 const (
+	// Extension discovered from the current project.
 	ExtensionsLoadedExtensionSourceProject ExtensionsLoadedExtensionSource = "project"
-	ExtensionsLoadedExtensionSourceUser    ExtensionsLoadedExtensionSource = "user"
+	// Extension discovered from the user's extension directory.
+	ExtensionsLoadedExtensionSourceUser ExtensionsLoadedExtensionSource = "user"
 )
 
 // Current status: running, disabled, failed, or starting
 type ExtensionsLoadedExtensionStatus string
 
 const (
+	// The extension is installed but disabled.
 	ExtensionsLoadedExtensionStatusDisabled ExtensionsLoadedExtensionStatus = "disabled"
-	ExtensionsLoadedExtensionStatusFailed   ExtensionsLoadedExtensionStatus = "failed"
-	ExtensionsLoadedExtensionStatusRunning  ExtensionsLoadedExtensionStatus = "running"
+	// The extension failed to start or crashed.
+	ExtensionsLoadedExtensionStatusFailed ExtensionsLoadedExtensionStatus = "failed"
+	// The extension process is running.
+	ExtensionsLoadedExtensionStatusRunning ExtensionsLoadedExtensionStatus = "running"
+	// The extension process is starting.
 	ExtensionsLoadedExtensionStatusStarting ExtensionsLoadedExtensionStatus = "starting"
 )
 
@@ -2768,7 +2792,9 @@ const (
 type HandoffSourceType string
 
 const (
-	HandoffSourceTypeLocal  HandoffSourceType = "local"
+	// The handoff originated from a local session.
+	HandoffSourceTypeLocal HandoffSourceType = "local"
+	// The handoff originated from a remote session.
 	HandoffSourceTypeRemote HandoffSourceType = "remote"
 )
 
@@ -2783,9 +2809,12 @@ const (
 type ModelCallFailureSource string
 
 const (
+	// Model call from MCP sampling.
 	ModelCallFailureSourceMcpSampling ModelCallFailureSource = "mcp_sampling"
-	ModelCallFailureSourceSubagent    ModelCallFailureSource = "subagent"
-	ModelCallFailureSourceTopLevel    ModelCallFailureSource = "top_level"
+	// Model call from a sub-agent.
+	ModelCallFailureSourceSubagent ModelCallFailureSource = "subagent"
+	// Model call from the top-level agent.
+	ModelCallFailureSourceTopLevel ModelCallFailureSource = "top_level"
 )
 
 // Kind discriminator for PermissionPromptRequest.
@@ -2809,8 +2838,11 @@ const (
 type PermissionPromptRequestPathAccessKind string
 
 const (
-	PermissionPromptRequestPathAccessKindRead  PermissionPromptRequestPathAccessKind = "read"
+	// Read access to a filesystem path.
+	PermissionPromptRequestPathAccessKindRead PermissionPromptRequestPathAccessKind = "read"
+	// Shell command access involving a filesystem path.
 	PermissionPromptRequestPathAccessKindShell PermissionPromptRequestPathAccessKind = "shell"
+	// Write access to a filesystem path.
 	PermissionPromptRequestPathAccessKindWrite PermissionPromptRequestPathAccessKind = "write"
 )
 
@@ -2834,16 +2866,20 @@ const (
 type PermissionRequestMemoryAction string
 
 const (
+	// Store a new memory.
 	PermissionRequestMemoryActionStore PermissionRequestMemoryAction = "store"
-	PermissionRequestMemoryActionVote  PermissionRequestMemoryAction = "vote"
+	// Vote on an existing memory.
+	PermissionRequestMemoryActionVote PermissionRequestMemoryAction = "vote"
 )
 
 // Vote direction (vote only)
 type PermissionRequestMemoryDirection string
 
 const (
+	// Vote that the memory is incorrect or outdated.
 	PermissionRequestMemoryDirectionDownvote PermissionRequestMemoryDirection = "downvote"
-	PermissionRequestMemoryDirectionUpvote   PermissionRequestMemoryDirection = "upvote"
+	// Vote that the memory is useful or accurate.
+	PermissionRequestMemoryDirectionUpvote PermissionRequestMemoryDirection = "upvote"
 )
 
 // Kind discriminator for PermissionResult.
@@ -2865,8 +2901,11 @@ const (
 type PlanChangedOperation string
 
 const (
+	// The plan file was created.
 	PlanChangedOperationCreate PlanChangedOperation = "create"
+	// The plan file was deleted.
 	PlanChangedOperationDelete PlanChangedOperation = "delete"
+	// The plan file was updated.
 	PlanChangedOperationUpdate PlanChangedOperation = "update"
 )
 
@@ -2874,16 +2913,20 @@ const (
 type SystemMessageRole string
 
 const (
+	// Developer instruction message.
 	SystemMessageRoleDeveloper SystemMessageRole = "developer"
-	SystemMessageRoleSystem    SystemMessageRole = "system"
+	// System prompt message.
+	SystemMessageRoleSystem SystemMessageRole = "system"
 )
 
 // Whether the agent completed successfully or failed
 type SystemNotificationAgentCompletedStatus string
 
 const (
+	// The agent completed successfully.
 	SystemNotificationAgentCompletedStatusCompleted SystemNotificationAgentCompletedStatus = "completed"
-	SystemNotificationAgentCompletedStatusFailed    SystemNotificationAgentCompletedStatus = "failed"
+	// The agent failed.
+	SystemNotificationAgentCompletedStatusFailed SystemNotificationAgentCompletedStatus = "failed"
 )
 
 // Type discriminator for SystemNotification.
@@ -2902,7 +2945,9 @@ const (
 type ToolExecutionCompleteContentResourceLinkIconTheme string
 
 const (
-	ToolExecutionCompleteContentResourceLinkIconThemeDark  ToolExecutionCompleteContentResourceLinkIconTheme = "dark"
+	// Icon intended for dark themes.
+	ToolExecutionCompleteContentResourceLinkIconThemeDark ToolExecutionCompleteContentResourceLinkIconTheme = "dark"
+	// Icon intended for light themes.
 	ToolExecutionCompleteContentResourceLinkIconThemeLight ToolExecutionCompleteContentResourceLinkIconTheme = "light"
 )
 
@@ -2922,19 +2967,26 @@ const (
 type UserMessageAgentMode string
 
 const (
-	UserMessageAgentModeAutopilot   UserMessageAgentMode = "autopilot"
+	// The agent is working autonomously toward task completion.
+	UserMessageAgentModeAutopilot UserMessageAgentMode = "autopilot"
+	// The agent is responding interactively to the user.
 	UserMessageAgentModeInteractive UserMessageAgentMode = "interactive"
-	UserMessageAgentModePlan        UserMessageAgentMode = "plan"
-	UserMessageAgentModeShell       UserMessageAgentMode = "shell"
+	// The agent is preparing a plan before making changes.
+	UserMessageAgentModePlan UserMessageAgentMode = "plan"
+	// The agent is in shell-focused UI mode.
+	UserMessageAgentModeShell UserMessageAgentMode = "shell"
 )
 
 // Type of GitHub reference
 type UserMessageAttachmentGithubReferenceType string
 
 const (
+	// GitHub discussion reference.
 	UserMessageAttachmentGithubReferenceTypeDiscussion UserMessageAttachmentGithubReferenceType = "discussion"
-	UserMessageAttachmentGithubReferenceTypeIssue      UserMessageAttachmentGithubReferenceType = "issue"
-	UserMessageAttachmentGithubReferenceTypePr         UserMessageAttachmentGithubReferenceType = "pr"
+	// GitHub issue reference.
+	UserMessageAttachmentGithubReferenceTypeIssue UserMessageAttachmentGithubReferenceType = "issue"
+	// GitHub pull request reference.
+	UserMessageAttachmentGithubReferenceTypePr UserMessageAttachmentGithubReferenceType = "pr"
 )
 
 // Type discriminator for UserMessageAttachment.
@@ -2952,7 +3004,9 @@ const (
 type WorkingDirectoryContextHostType string
 
 const (
-	WorkingDirectoryContextHostTypeAdo    WorkingDirectoryContextHostType = "ado"
+	// Repository is hosted on Azure DevOps.
+	WorkingDirectoryContextHostTypeAdo WorkingDirectoryContextHostType = "ado"
+	// Repository is hosted on GitHub.
 	WorkingDirectoryContextHostTypeGithub WorkingDirectoryContextHostType = "github"
 )
 
@@ -2960,7 +3014,9 @@ const (
 type WorkspaceFileChangedOperation string
 
 const (
+	// The workspace file was created.
 	WorkspaceFileChangedOperationCreate WorkspaceFileChangedOperation = "create"
+	// The workspace file was updated.
 	WorkspaceFileChangedOperationUpdate WorkspaceFileChangedOperation = "update"
 )
 
diff --git a/nodejs/package-lock.json b/nodejs/package-lock.json
index 01f81eb7a..d08959584 100644
--- a/nodejs/package-lock.json
+++ b/nodejs/package-lock.json
@@ -9,7 +9,7 @@
             "version": "0.1.8",
             "license": "MIT",
             "dependencies": {
-                "@github/copilot": "^1.0.51-2",
+                "@github/copilot": "^1.0.51-3",
                 "vscode-jsonrpc": "^8.2.1",
                 "zod": "^4.3.6"
             },
@@ -663,9 +663,9 @@
             }
         },
         "node_modules/@github/copilot": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot/-/copilot-1.0.51-2.tgz",
-            "integrity": "sha512-z9DFxVYIvY4MPEidWJxHdJoQNeDRt86egFyVek3zIVOCH5V6+NTF8ZuJAdMJJqbt+5EWxOgT4wBY4JvUfN7fCg==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot/-/copilot-1.0.51-3.tgz",
+            "integrity": "sha512-wbulKqSHhqVXoA8ffqukq3AxMGw8VfVbZ5ysGW+WSHbWXydh9aEKo9/4PqxUxWB4W9oSPggoqrVhj0NgJJ4agw==",
             "license": "SEE LICENSE IN LICENSE.md",
             "dependencies": {
                 "detect-libc": "^2.1.2"
@@ -674,20 +674,20 @@
                 "copilot": "npm-loader.js"
             },
             "optionalDependencies": {
-                "@github/copilot-darwin-arm64": "1.0.51-2",
-                "@github/copilot-darwin-x64": "1.0.51-2",
-                "@github/copilot-linux-arm64": "1.0.51-2",
-                "@github/copilot-linux-x64": "1.0.51-2",
-                "@github/copilot-linuxmusl-arm64": "1.0.51-2",
-                "@github/copilot-linuxmusl-x64": "1.0.51-2",
-                "@github/copilot-win32-arm64": "1.0.51-2",
-                "@github/copilot-win32-x64": "1.0.51-2"
+                "@github/copilot-darwin-arm64": "1.0.51-3",
+                "@github/copilot-darwin-x64": "1.0.51-3",
+                "@github/copilot-linux-arm64": "1.0.51-3",
+                "@github/copilot-linux-x64": "1.0.51-3",
+                "@github/copilot-linuxmusl-arm64": "1.0.51-3",
+                "@github/copilot-linuxmusl-x64": "1.0.51-3",
+                "@github/copilot-win32-arm64": "1.0.51-3",
+                "@github/copilot-win32-x64": "1.0.51-3"
             }
         },
         "node_modules/@github/copilot-darwin-arm64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-darwin-arm64/-/copilot-darwin-arm64-1.0.51-2.tgz",
-            "integrity": "sha512-iOIAIBbOKuOnUGhsVvmFdrdKu5olSZ1Ve5RkwWj9E/62g4dAuGrEkhisA6xcNt63qDfGfsPQcDKkR+Nhxrgp4g==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-darwin-arm64/-/copilot-darwin-arm64-1.0.51-3.tgz",
+            "integrity": "sha512-PXnMWuaUIbxkBzeDr4cKQy7qtFqldufzWvihI5QhJaF7/l0L/8XoTGtj73qbX7IpG4wpzQ1N8MIZFm/SmyKoqQ==",
             "cpu": [
                 "arm64"
             ],
@@ -701,9 +701,9 @@
             }
         },
         "node_modules/@github/copilot-darwin-x64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-darwin-x64/-/copilot-darwin-x64-1.0.51-2.tgz",
-            "integrity": "sha512-7AYiP1D8mZg0UOSx0hiMGS6ZOTKA4miiHpiS5Bvd5AgTchWFNBgM/aHs1D/VSk0dLucGGzSClwzL5u80hNiw/Q==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-darwin-x64/-/copilot-darwin-x64-1.0.51-3.tgz",
+            "integrity": "sha512-sIRQBZjYh7gGDd2wUjgmX5PTfFZfvzrQp8lNvoRsqKnihzPnGaRg+St3lh7St3qtHoOBAaAoYw/DHREEp/p9xg==",
             "cpu": [
                 "x64"
             ],
@@ -717,9 +717,9 @@
             }
         },
         "node_modules/@github/copilot-linux-arm64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-linux-arm64/-/copilot-linux-arm64-1.0.51-2.tgz",
-            "integrity": "sha512-X5QVYcaU1IDeawCDxC8NHf8s/8Tq9NX+2a/tKXDFBFLIisoXZCpU0Ap9KRSGyKe8heJbvuDoW4JaJRZj4faAqw==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-linux-arm64/-/copilot-linux-arm64-1.0.51-3.tgz",
+            "integrity": "sha512-LzFRV9EqSFdEiqu+VyoDY4XcO3tvd7VmVzkF02BP9MgwApCCLRzJS4ElMh/3FojqV+hL18vpFSyqPVmsgjLcug==",
             "cpu": [
                 "arm64"
             ],
@@ -733,9 +733,9 @@
             }
         },
         "node_modules/@github/copilot-linux-x64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-linux-x64/-/copilot-linux-x64-1.0.51-2.tgz",
-            "integrity": "sha512-wn4W2K+kV3f5XZ8iG7ZplLuxkv9m3oFNcgdfFF5LSlU39k9l/WFahCKWWP6ec4DG9cvfR/Z0Sj4rmQPJoF/nkg==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-linux-x64/-/copilot-linux-x64-1.0.51-3.tgz",
+            "integrity": "sha512-bMEE8/nj9GWx3f/PWvoSGnk6IUHoeVtdDNJk7xUTMMK2eQBUQGKfCtOKTa/mSVpJB81bxiK8IVqZypJO2cYxqQ==",
             "cpu": [
                 "x64"
             ],
@@ -749,9 +749,9 @@
             }
         },
         "node_modules/@github/copilot-linuxmusl-arm64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-arm64/-/copilot-linuxmusl-arm64-1.0.51-2.tgz",
-            "integrity": "sha512-cQ4cJ42pN4b3Up5fDpRvVP+yPYifgQD2vplvUavY6bffCCYwLqzK4oHFsABC8uvtqkIq/GbFOZ6XF2W+YdVFUQ==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-arm64/-/copilot-linuxmusl-arm64-1.0.51-3.tgz",
+            "integrity": "sha512-ZEr7RmNv8/FyWdbC6xBPdb7HZO0QdlTGt1SOO+AHW1PuHYdYBdGObDB41SfHf+h0kiiljBsLq8ps1njP/1kIDw==",
             "cpu": [
                 "arm64"
             ],
@@ -765,9 +765,9 @@
             }
         },
         "node_modules/@github/copilot-linuxmusl-x64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-x64/-/copilot-linuxmusl-x64-1.0.51-2.tgz",
-            "integrity": "sha512-3wm34yzDeCW2U0im6qDK51iF6dJHhrPqv3VxPwfvTK+7u5iWB9oaGvFRCYtQfA5sV0hJqmD6Gup6MJwB4JgEEQ==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-x64/-/copilot-linuxmusl-x64-1.0.51-3.tgz",
+            "integrity": "sha512-d4BH9FkXTTSuXfVElNAHe4djktueVQUTj9cOdmKeQKC80Magew1F+7RvCgIDFupmhYnra+1NJf5nM7+wpiaECg==",
             "cpu": [
                 "x64"
             ],
@@ -781,9 +781,9 @@
             }
         },
         "node_modules/@github/copilot-win32-arm64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-win32-arm64/-/copilot-win32-arm64-1.0.51-2.tgz",
-            "integrity": "sha512-uAj1YwA8n/qbI1JG8UjHGtuBrJL18FSRkXwB0SdM0aKUozhZs3vdxRROuT5MAbt72KWk+rLldnkVy6HL/tm8sA==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-win32-arm64/-/copilot-win32-arm64-1.0.51-3.tgz",
+            "integrity": "sha512-o/tQTD4VFKhEfoxHD5HMdoaqys5jFt8+pXkQKXSFlkGWzAQZt4iZasIC7L5f/AuGctoZ/kZFW2iMOWNpDHtj5w==",
             "cpu": [
                 "arm64"
             ],
@@ -797,9 +797,9 @@
             }
         },
         "node_modules/@github/copilot-win32-x64": {
-            "version": "1.0.51-2",
-            "resolved": "https://registry.npmjs.org/@github/copilot-win32-x64/-/copilot-win32-x64-1.0.51-2.tgz",
-            "integrity": "sha512-Wur8d0y6VsXGbsMhED3uoZylRoJyWLQPHzgf3TD2AEc48zVpuTb4jUKzH9wD1frheAxGTl/kWvLr+6rYRcPK7w==",
+            "version": "1.0.51-3",
+            "resolved": "https://registry.npmjs.org/@github/copilot-win32-x64/-/copilot-win32-x64-1.0.51-3.tgz",
+            "integrity": "sha512-CjpogQNnl0YrEfTCPSUtKPpieVEfWWP2map4OQNLSJXwQ3toG1h359m4QXXLuSz/vJM8aCrCm1VxgCg5KR1eKw==",
             "cpu": [
                 "x64"
             ],
diff --git a/nodejs/package.json b/nodejs/package.json
index d3f4eee13..b99c91efa 100644
--- a/nodejs/package.json
+++ b/nodejs/package.json
@@ -56,7 +56,7 @@
     "author": "GitHub",
     "license": "MIT",
     "dependencies": {
-        "@github/copilot": "^1.0.51-2",
+        "@github/copilot": "^1.0.51-3",
         "vscode-jsonrpc": "^8.2.1",
         "zod": "^4.3.6"
     },
diff --git a/nodejs/samples/package-lock.json b/nodejs/samples/package-lock.json
index 95a1e1bb3..9c93d8dae 100644
--- a/nodejs/samples/package-lock.json
+++ b/nodejs/samples/package-lock.json
@@ -18,7 +18,7 @@
             "version": "0.1.8",
             "license": "MIT",
             "dependencies": {
-                "@github/copilot": "^1.0.51-2",
+                "@github/copilot": "^1.0.51-3",
                 "vscode-jsonrpc": "^8.2.1",
                 "zod": "^4.3.6"
             },
diff --git a/nodejs/src/generated/rpc.ts b/nodejs/src/generated/rpc.ts
index 20a4d6afe..9386e7bc7 100644
--- a/nodejs/src/generated/rpc.ts
+++ b/nodejs/src/generated/rpc.ts
@@ -14,7 +14,19 @@ import type { AbortReason, EmbeddedBlobResourceContents, EmbeddedTextResourceCon
  * via the `definition` "AgentInfoSource".
  */
 /** @experimental */
-export type AgentInfoSource = "user" | "project" | "inherited" | "remote" | "plugin" | "builtin";
+export type AgentInfoSource =
+  /** Agent loaded from the user's personal agent configuration. */
+  | "user"
+  /** Agent loaded from the current project's repository configuration. */
+  | "project"
+  /** Agent inherited from a parent project or workspace. */
+  | "inherited"
+  /** Agent provided by a remote runtime or service. */
+  | "remote"
+  /** Agent contributed by an installed plugin. */
+  | "plugin"
+  /** Agent built into the Copilot runtime. */
+  | "builtin";
 /**
  * The new auth credentials to install on the session. When omitted or `undefined`, the call is a no-op and the session's existing credentials are preserved. The runtime stores the value verbatim and uses it for outbound model/API requests; it does NOT re-validate or re-fetch the associated Copilot user response. Several variants carry secret material; treat this method's params as containing secrets at rest and in transit.
  *
@@ -35,21 +47,41 @@ export type AuthInfo =
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "AuthInfoType".
  */
-export type AuthInfoType = "hmac" | "env" | "user" | "gh-cli" | "api-key" | "token" | "copilot-api-token";
+export type AuthInfoType =
+  /** Authentication provided by a GitHub App HMAC credential. */
+  | "hmac"
+  /** Authentication resolved from environment-provided credentials. */
+  | "env"
+  /** Authentication from an interactive user sign-in. */
+  | "user"
+  /** Authentication delegated to the GitHub CLI. */
+  | "gh-cli"
+  /** Authentication from an API key credential. */
+  | "api-key"
+  /** Authentication from a GitHub token. */
+  | "token"
+  /** Authentication from a Copilot API token. */
+  | "copilot-api-token";
 /**
  * Coarse command category for grouping and behavior: runtime built-in, skill-backed command, or SDK/client-owned command
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SlashCommandKind".
  */
-export type SlashCommandKind = "builtin" | "skill" | "client";
+export type SlashCommandKind =
+  /** Command implemented by the runtime. */
+  | "builtin"
+  /** Command backed by a skill. */
+  | "skill"
+  /** Command registered by an SDK client or extension. */
+  | "client";
 /**
  * Optional completion hint for the input (e.g. 'directory' for filesystem path completion)
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SlashCommandInputCompletion".
  */
-export type SlashCommandInputCompletion = "directory";
+export type SlashCommandInputCompletion = /** Input should complete filesystem directories. */ "directory";
 /**
  * Result of the queued command execution.
  *
@@ -64,21 +96,39 @@ export type QueuedCommandResult = QueuedCommandHandled | QueuedCommandNotHandled
  * via the `definition` "ConnectedRemoteSessionMetadataKind".
  */
 /** @experimental */
-export type ConnectedRemoteSessionMetadataKind = "remote-session" | "coding-agent";
+export type ConnectedRemoteSessionMetadataKind =
+  /** Remote CLI session. */
+  | "remote-session"
+  /** GitHub Copilot coding agent session. */
+  | "coding-agent";
 /**
  * Controls how MCP tool result content is filtered: none leaves content unchanged, markdown sanitizes HTML while preserving Markdown-friendly output, and hidden_characters removes characters that can hide directives.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ContentFilterMode".
  */
-export type ContentFilterMode = "none" | "markdown" | "hidden_characters";
+export type ContentFilterMode =
+  /** Leave MCP tool result content unchanged. */
+  | "none"
+  /** Sanitize HTML while preserving Markdown-friendly output. */
+  | "markdown"
+  /** Remove characters that can hide directives. */
+  | "hidden_characters";
 /**
  * Server transport type: stdio, http, sse, or memory
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "DiscoveredMcpServerType".
  */
-export type DiscoveredMcpServerType = "stdio" | "http" | "sse" | "memory";
+export type DiscoveredMcpServerType =
+  /** Server communicates over stdio with a local child process. */
+  | "stdio"
+  /** Server communicates over streamable HTTP. */
+  | "http"
+  /** Server communicates over Server-Sent Events. */
+  | "sse"
+  /** Server is backed by an in-memory runtime implementation. */
+  | "memory";
 /**
  * Either '*' to receive all event types, or a non-empty list of event types to receive
  *
@@ -94,7 +144,11 @@ export type EventLogTypes = "*" | [string, ...string[]];
  * via the `definition` "EventsAgentScope".
  */
 /** @experimental */
-export type EventsAgentScope = "primary" | "all";
+export type EventsAgentScope =
+  /** Return main-agent events and typed subagent lifecycle events. */
+  | "primary"
+  /** Return events from all agents. */
+  | "all";
 /**
  * Cursor status: 'ok' means the cursor was applied successfully; 'expired' means the cursor referred to an event that no longer exists in history (e.g. truncated or compacted away) and the read started from the beginning of the remaining history.
  *
@@ -102,7 +156,11 @@ export type EventsAgentScope = "primary" | "all";
  * via the `definition` "EventsCursorStatus".
  */
 /** @experimental */
-export type EventsCursorStatus = "ok" | "expired";
+export type EventsCursorStatus =
+  /** The cursor was applied successfully. */
+  | "ok"
+  /** The cursor referred to history that is no longer available. */
+  | "expired";
 /**
  * Discovery source: project (.github/extensions/) or user (~/.copilot/extensions/)
  *
@@ -110,7 +168,11 @@ export type EventsCursorStatus = "ok" | "expired";
  * via the `definition` "ExtensionSource".
  */
 /** @experimental */
-export type ExtensionSource = "project" | "user";
+export type ExtensionSource =
+  /** Extension discovered from the current project's .github/extensions directory. */
+  | "project"
+  /** Extension discovered from the user's ~/.copilot/extensions directory. */
+  | "user";
 /**
  * Current status: running, disabled, failed, or starting
  *
@@ -118,7 +180,15 @@ export type ExtensionSource = "project" | "user";
  * via the `definition` "ExtensionStatus".
  */
 /** @experimental */
-export type ExtensionStatus = "running" | "disabled" | "failed" | "starting";
+export type ExtensionStatus =
+  /** The extension process is running. */
+  | "running"
+  /** The extension is installed but disabled. */
+  | "disabled"
+  /** The extension failed to start or crashed. */
+  | "failed"
+  /** The extension process is starting. */
+  | "starting";
 /**
  * Tool call result (string or expanded result object)
  *
@@ -132,7 +202,11 @@ export type ExternalToolResult = string | ExternalToolTextResultForLlm;
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ExternalToolTextResultForLlmBinaryResultsForLlmType".
  */
-export type ExternalToolTextResultForLlmBinaryResultsForLlmType = "image" | "resource";
+export type ExternalToolTextResultForLlmBinaryResultsForLlmType =
+  /** Binary image data. */
+  | "image"
+  /** Other binary resource data. */
+  | "resource";
 /**
  * A content block within a tool result, which may be text, terminal output, image, audio, or a resource
  *
@@ -152,7 +226,11 @@ export type ExternalToolTextResultForLlmContent =
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ExternalToolTextResultForLlmContentResourceLinkIconTheme".
  */
-export type ExternalToolTextResultForLlmContentResourceLinkIconTheme = "light" | "dark";
+export type ExternalToolTextResultForLlmContentResourceLinkIconTheme =
+  /** Icon intended for light themes. */
+  | "light"
+  /** Icon intended for dark themes. */
+  | "dark";
 /**
  * The embedded resource contents, either text or base64-encoded binary
  *
@@ -192,12 +270,19 @@ export type InstalledPluginSource =
  * via the `definition` "InstructionsSourcesType".
  */
 export type InstructionsSourcesType =
+  /** Instructions loaded from the user's home configuration. */
   | "home"
+  /** Instructions loaded from repository-scoped files. */
   | "repo"
+  /** Instructions loaded from model-specific files. */
   | "model"
+  /** Instructions loaded from VS Code instruction files. */
   | "vscode"
+  /** Instructions discovered from nested agent files. */
   | "nested-agents"
+  /** Instructions inherited from child instruction files. */
   | "child-instructions"
+  /** Instructions supplied by an installed plugin. */
   | "plugin";
 /**
  * Where this source lives — used for UI grouping
@@ -205,14 +290,28 @@ export type InstructionsSourcesType =
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "InstructionsSourcesLocation".
  */
-export type InstructionsSourcesLocation = "user" | "repository" | "working-directory" | "plugin";
+export type InstructionsSourcesLocation =
+  /** Instructions live in user-level configuration. */
+  | "user"
+  /** Instructions live in repository-level configuration. */
+  | "repository"
+  /** Instructions live under the current working directory. */
+  | "working-directory"
+  /** Instructions live in plugin-provided configuration. */
+  | "plugin";
 /**
  * Log severity level. Determines how the message is displayed in the timeline. Defaults to "info".
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SessionLogLevel".
  */
-export type SessionLogLevel = "info" | "warning" | "error";
+export type SessionLogLevel =
+  /** Informational message. */
+  | "info"
+  /** Warning message that may require attention. */
+  | "warning"
+  /** Error message describing a failure. */
+  | "error";
 /**
  * MCP server configuration (stdio process or remote HTTP/SSE)
  *
@@ -226,14 +325,22 @@ export type McpServerConfig = McpServerConfigStdio | McpServerConfigHttp;
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "McpServerConfigHttpType".
  */
-export type McpServerConfigHttpType = "http" | "sse";
+export type McpServerConfigHttpType =
+  /** Streamable HTTP transport. */
+  | "http"
+  /** Server-Sent Events transport. */
+  | "sse";
 /**
  * OAuth grant type to use when authenticating to the remote MCP server.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "McpServerConfigHttpOauthGrantType".
  */
-export type McpServerConfigHttpOauthGrantType = "authorization_code" | "client_credentials";
+export type McpServerConfigHttpOauthGrantType =
+  /** Interactive browser-based authorization code flow with PKCE. */
+  | "authorization_code"
+  /** Headless client credentials flow using the configured OAuth client. */
+  | "client_credentials";
 /**
  * Outcome of the sampling inference. 'success' produced a response; 'failure' encountered an error (including agent-side rejection by content filter or criteria); 'cancelled' the caller cancelled this execution via cancelSamplingExecution.
  *
@@ -241,7 +348,13 @@ export type McpServerConfigHttpOauthGrantType = "authorization_code" | "client_c
  * via the `definition` "McpSamplingExecutionAction".
  */
 /** @experimental */
-export type McpSamplingExecutionAction = "success" | "failure" | "cancelled";
+export type McpSamplingExecutionAction =
+  /** The sampling inference completed and produced a result. */
+  | "success"
+  /** The sampling inference failed or was rejected. */
+  | "failure"
+  /** The sampling inference was cancelled before completion. */
+  | "cancelled";
 /**
  * How environment-variable values supplied to MCP servers are resolved. "direct" passes literal string values; "indirect" treats values as references (e.g. names of environment variables on the host) that the runtime resolves before launch. Defaults to the runtime's startup mode; clients that intentionally launch MCP servers with literal values (e.g. CLI prompt mode and ACP) set this to "direct".
  *
@@ -249,7 +362,11 @@ export type McpSamplingExecutionAction = "success" | "failure" | "cancelled";
  * via the `definition` "McpSetEnvValueModeDetails".
  */
 /** @experimental */
-export type McpSetEnvValueModeDetails = "direct" | "indirect";
+export type McpSetEnvValueModeDetails =
+  /** Treat MCP server environment values as literal strings. */
+  | "direct"
+  /** Treat MCP server environment values as host-side references to resolve before launch. */
+  | "indirect";
 /**
  * Token breakdown for the current context window, or null if the session has not yet been initialized (no system prompt or tool metadata cached).
  *
@@ -302,7 +419,11 @@ export type SessionContextInfo = {
  * via the `definition` "SessionWorkingDirectoryContextHostType".
  */
 /** @experimental */
-export type SessionWorkingDirectoryContextHostType = "github" | "ado";
+export type SessionWorkingDirectoryContextHostType =
+  /** The working directory repository is hosted on GitHub. */
+  | "github"
+  /** The working directory repository is hosted on Azure DevOps. */
+  | "ado";
 /**
  * The current agent mode for this session (e.g., 'interactive', 'plan', 'autopilot')
  *
@@ -310,7 +431,13 @@ export type SessionWorkingDirectoryContextHostType = "github" | "ado";
  * via the `definition` "MetadataSnapshotCurrentMode".
  */
 /** @experimental */
-export type MetadataSnapshotCurrentMode = "interactive" | "plan" | "autopilot";
+export type MetadataSnapshotCurrentMode =
+  /** The agent is responding interactively to the user. */
+  | "interactive"
+  /** The agent is preparing a plan before making changes. */
+  | "plan"
+  /** The agent is working autonomously toward task completion. */
+  | "autopilot";
 /**
  * Whether the remote task originated from Copilot Coding Agent (cca) or a CLI `--remote` invocation.
  *
@@ -318,28 +445,52 @@ export type MetadataSnapshotCurrentMode = "interactive" | "plan" | "autopilot";
  * via the `definition` "MetadataSnapshotRemoteMetadataTaskType".
  */
 /** @experimental */
-export type MetadataSnapshotRemoteMetadataTaskType = "cca" | "cli";
+export type MetadataSnapshotRemoteMetadataTaskType =
+  /** Remote task originated from Copilot Coding Agent. */
+  | "cca"
+  /** Remote task originated from a CLI remote-session invocation. */
+  | "cli";
 /**
  * Current policy state for this model
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ModelPolicyState".
  */
-export type ModelPolicyState = "enabled" | "disabled" | "unconfigured";
+export type ModelPolicyState =
+  /** The model is enabled by policy. */
+  | "enabled"
+  /** The model is disabled by policy. */
+  | "disabled"
+  /** No explicit policy is configured for the model. */
+  | "unconfigured";
 /**
  * Model capability category for grouping in the model picker
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ModelPickerCategory".
  */
-export type ModelPickerCategory = "lightweight" | "versatile" | "powerful";
+export type ModelPickerCategory =
+  /** Lightweight model category optimized for faster, lower-cost interactions. */
+  | "lightweight"
+  /** Versatile model category suitable for a broad range of tasks. */
+  | "versatile"
+  /** Powerful model category optimized for complex tasks. */
+  | "powerful";
 /**
  * Relative cost tier for token-based billing users
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ModelPickerPriceCategory".
  */
-export type ModelPickerPriceCategory = "low" | "medium" | "high" | "very_high";
+export type ModelPickerPriceCategory =
+  /** Lowest relative token cost tier. */
+  | "low"
+  /** Medium relative token cost tier. */
+  | "medium"
+  /** High relative token cost tier. */
+  | "high"
+  /** Highest relative token cost tier. */
+  | "very_high";
 /**
  * How env values are passed to MCP servers (`direct` inlines literal values; `indirect` resolves at launch).
  *
@@ -347,7 +498,11 @@ export type ModelPickerPriceCategory = "low" | "medium" | "high" | "very_high";
  * via the `definition` "OptionsUpdateEnvValueMode".
  */
 /** @experimental */
-export type OptionsUpdateEnvValueMode = "direct" | "indirect";
+export type OptionsUpdateEnvValueMode =
+  /** Pass MCP server environment values as literal strings. */
+  | "direct"
+  /** Resolve MCP server environment values from host-side references. */
+  | "indirect";
 /**
  * The client's response to the pending permission prompt
  *
@@ -408,21 +563,37 @@ export type PermissionDecisionApproveForLocationApproval =
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "PermissionsConfigureAdditionalContentExclusionPolicyScope".
  */
-export type PermissionsConfigureAdditionalContentExclusionPolicyScope = "repo" | "all";
+export type PermissionsConfigureAdditionalContentExclusionPolicyScope =
+  /** The content exclusion policy applies to the current repository. */
+  | "repo"
+  /** The content exclusion policy applies across all repositories. */
+  | "all";
 /**
  * Whether the change applies to ephemeral session-scoped rules (cleared at session end) or to location-scoped rules persisted via the location-permissions config file.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "PermissionsModifyRulesScope".
  */
-export type PermissionsModifyRulesScope = "session" | "location";
+export type PermissionsModifyRulesScope =
+  /** Apply the rule change only to this session. */
+  | "session"
+  /** Persist the rule change for this project location. */
+  | "location";
 /**
  * Optional source for allow-all telemetry. Defaults to `rpc` when omitted for SDK callers.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "PermissionsSetApproveAllSource".
  */
-export type PermissionsSetApproveAllSource = "cli_flag" | "slash_command" | "autopilot_confirmation" | "rpc";
+export type PermissionsSetApproveAllSource =
+  /** Allow-all was enabled from a CLI command-line flag. */
+  | "cli_flag"
+  /** Allow-all was enabled by a slash command. */
+  | "slash_command"
+  /** Allow-all was enabled by confirming autopilot behavior. */
+  | "autopilot_confirmation"
+  /** Allow-all was enabled through an RPC caller. */
+  | "rpc";
 /**
  * Whether this item is a queued user message or a queued slash command / model change
  *
@@ -430,7 +601,11 @@ export type PermissionsSetApproveAllSource = "cli_flag" | "slash_command" | "aut
  * via the `definition` "QueuePendingItemsKind".
  */
 /** @experimental */
-export type QueuePendingItemsKind = "message" | "command";
+export type QueuePendingItemsKind =
+  /** A queued user message. */
+  | "message"
+  /** A queued slash command or model-change command. */
+  | "command";
 /**
  * Per-session remote mode. "off" disables remote, "export" exports session events to GitHub without enabling remote steering, "on" enables both export and remote steering.
  *
@@ -438,14 +613,28 @@ export type QueuePendingItemsKind = "message" | "command";
  * via the `definition` "RemoteSessionMode".
  */
 /** @experimental */
-export type RemoteSessionMode = "off" | "export" | "on";
+export type RemoteSessionMode =
+  /** Disable remote session export and steering. */
+  | "off"
+  /** Export session events to GitHub without enabling remote steering. */
+  | "export"
+  /** Enable both remote session export and remote steering. */
+  | "on";
 /**
  * The UI mode the agent was in when this message was sent. Defaults to the session's current mode.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SendAgentMode".
  */
-export type SendAgentMode = "interactive" | "plan" | "autopilot" | "shell";
+export type SendAgentMode =
+  /** The agent is responding interactively to the user. */
+  | "interactive"
+  /** The agent is preparing a plan before making changes. */
+  | "plan"
+  /** The agent is working autonomously toward task completion. */
+  | "autopilot"
+  /** The agent is in shell-focused UI mode. */
+  | "shell";
 /**
  * A user message attachment — a file, directory, code selection, blob, or GitHub reference
  *
@@ -464,14 +653,24 @@ export type SendAttachment =
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SendAttachmentGithubReferenceType".
  */
-export type SendAttachmentGithubReferenceType = "issue" | "pr" | "discussion";
+export type SendAttachmentGithubReferenceType =
+  /** GitHub issue reference. */
+  | "issue"
+  /** GitHub pull request reference. */
+  | "pr"
+  /** GitHub discussion reference. */
+  | "discussion";
 /**
  * How to deliver the message. `enqueue` (default) appends to the message queue. `immediate` interjects during an in-progress turn.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SendMode".
  */
-export type SendMode = "enqueue" | "immediate";
+export type SendMode =
+  /** Append the message to the normal session queue. */
+  | "enqueue"
+  /** Interject the message during the in-progress turn. */
+  | "immediate";
 /**
  * Repository host type
  *
@@ -479,35 +678,57 @@ export type SendMode = "enqueue" | "immediate";
  * via the `definition` "SessionContextHostType".
  */
 /** @experimental */
-export type SessionContextHostType = "github" | "ado";
+export type SessionContextHostType =
+  /** Session repository is hosted on GitHub. */
+  | "github"
+  /** Session repository is hosted on Azure DevOps. */
+  | "ado";
 /**
  * Error classification
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SessionFsErrorCode".
  */
-export type SessionFsErrorCode = "ENOENT" | "UNKNOWN";
+export type SessionFsErrorCode =
+  /** The requested path does not exist. */
+  | "ENOENT"
+  /** The filesystem operation failed for an unspecified reason. */
+  | "UNKNOWN";
 /**
  * Entry type
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SessionFsReaddirWithTypesEntryType".
  */
-export type SessionFsReaddirWithTypesEntryType = "file" | "directory";
+export type SessionFsReaddirWithTypesEntryType =
+  /** The entry is a file. */
+  | "file"
+  /** The entry is a directory. */
+  | "directory";
 /**
  * Path conventions used by this filesystem
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SessionFsSetProviderConventions".
  */
-export type SessionFsSetProviderConventions = "windows" | "posix";
+export type SessionFsSetProviderConventions =
+  /** Paths use Windows path conventions. */
+  | "windows"
+  /** Paths use POSIX path conventions. */
+  | "posix";
 /**
  * How to execute the query: 'exec' for DDL/multi-statement (no results), 'query' for SELECT (returns rows), 'run' for INSERT/UPDATE/DELETE (returns rowsAffected)
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "SessionFsSqliteQueryType".
  */
-export type SessionFsSqliteQueryType = "exec" | "query" | "run";
+export type SessionFsSqliteQueryType =
+  /** Execute DDL or multi-statement SQL without returning rows. */
+  | "exec"
+  /** Execute a SELECT-style query and return rows. */
+  | "query"
+  /** Execute INSERT, UPDATE, or DELETE SQL and return affected-row metadata. */
+  | "run";
 /**
  * Source descriptor for direct repo installs (when marketplace is empty)
  *
@@ -547,7 +768,10 @@ export type WorkspaceSummary = {
   /**
    * Repository host type, if known
    */
-  host_type?: "github" | "ado";
+  host_type?: /** Workspace summary repository is hosted on GitHub. */
+    | "github"
+    /** Workspace summary repository is hosted on Azure DevOps. */
+    | "ado";
   /**
    * Branch checked out at session start, if any
    */
@@ -571,7 +795,13 @@ export type WorkspaceSummary = {
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "ShellKillSignal".
  */
-export type ShellKillSignal = "SIGTERM" | "SIGKILL" | "SIGINT";
+export type ShellKillSignal =
+  /** Request graceful process termination. */
+  | "SIGTERM"
+  /** Forcefully terminate the process. */
+  | "SIGKILL"
+  /** Send an interrupt signal to the process. */
+  | "SIGINT";
 /**
  * Result of invoking the slash command (text output, prompt to send to the agent, or completion).
  *
@@ -581,7 +811,8 @@ export type ShellKillSignal = "SIGTERM" | "SIGKILL" | "SIGINT";
 export type SlashCommandInvocationResult =
   | SlashCommandTextResult
   | SlashCommandAgentPromptResult
-  | SlashCommandCompletedResult;
+  | SlashCommandCompletedResult
+  | SlashCommandSelectSubcommandResult;
 /**
  * Current lifecycle status of the task
  *
@@ -589,7 +820,17 @@ export type SlashCommandInvocationResult =
  * via the `definition` "TaskStatus".
  */
 /** @experimental */
-export type TaskStatus = "running" | "idle" | "completed" | "failed" | "cancelled";
+export type TaskStatus =
+  /** The task is actively executing. */
+  | "running"
+  /** The task is waiting for additional input. */
+  | "idle"
+  /** The task finished successfully. */
+  | "completed"
+  /** The task finished with an error. */
+  | "failed"
+  /** The task was cancelled before completion. */
+  | "cancelled";
 /**
  * Whether task execution is synchronously awaited or managed in the background
  *
@@ -597,7 +838,11 @@ export type TaskStatus = "running" | "idle" | "completed" | "failed" | "cancelle
  * via the `definition` "TaskExecutionMode".
  */
 /** @experimental */
-export type TaskExecutionMode = "sync" | "background";
+export type TaskExecutionMode =
+  /** The task was started with synchronous waiting. */
+  | "sync"
+  /** The task is managed in the background. */
+  | "background";
 /**
  * Schema for the `TaskAgentProgress` type.
  *
@@ -658,7 +903,11 @@ export type TaskInfo = TaskAgentInfo | TaskShellInfo;
  * via the `definition` "TaskShellInfoAttachmentMode".
  */
 /** @experimental */
-export type TaskShellInfoAttachmentMode = "attached" | "detached";
+export type TaskShellInfoAttachmentMode =
+  /** The shell runs in a managed PTY session. */
+  | "attached"
+  /** The shell runs as an independent background process. */
+  | "detached";
 /**
  * Progress information for the task, discriminated by type. Returns null when no task with this ID is currently tracked.
  *
@@ -681,7 +930,13 @@ export type TaskShellProgress = null;
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "UIAutoModeSwitchResponse".
  */
-export type UIAutoModeSwitchResponse = "yes" | "yes_always" | "no";
+export type UIAutoModeSwitchResponse =
+  /** Allow the automatic mode switch for this turn. */
+  | "yes"
+  /** Allow this mode switch and persist the preference. */
+  | "yes_always"
+  /** Decline the automatic mode switch. */
+  | "no";
 /**
  * Schema for the `UIElicitationFieldValue` type.
  *
@@ -712,28 +967,54 @@ export type UIElicitationSchemaProperty =
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "UIElicitationSchemaPropertyStringFormat".
  */
-export type UIElicitationSchemaPropertyStringFormat = "email" | "uri" | "date" | "date-time";
+export type UIElicitationSchemaPropertyStringFormat =
+  /** Email address string format. */
+  | "email"
+  /** URI string format. */
+  | "uri"
+  /** Calendar date string format. */
+  | "date"
+  /** Date-time string format. */
+  | "date-time";
 /**
  * Numeric type accepted by the field.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "UIElicitationSchemaPropertyNumberType".
  */
-export type UIElicitationSchemaPropertyNumberType = "number" | "integer";
+export type UIElicitationSchemaPropertyNumberType =
+  /** Any JSON number. */
+  | "number"
+  /** Integer JSON number. */
+  | "integer";
 /**
  * The user's response: accept (submitted), decline (rejected), or cancel (dismissed)
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "UIElicitationResponseAction".
  */
-export type UIElicitationResponseAction = "accept" | "decline" | "cancel";
+export type UIElicitationResponseAction =
+  /** The user submitted the requested form values. */
+  | "accept"
+  /** The user explicitly declined to provide the requested input. */
+  | "decline"
+  /** The user dismissed the elicitation request. */
+  | "cancel";
 /**
  * The action the user selected. Defaults to 'autopilot' when autoApproveEdits is true, otherwise 'interactive'.
  *
  * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
  * via the `definition` "UIExitPlanModeAction".
  */
-export type UIExitPlanModeAction = "exit_only" | "interactive" | "autopilot" | "autopilot_fleet";
+export type UIExitPlanModeAction =
+  /** Exit plan mode without starting implementation. */
+  | "exit_only"
+  /** Exit plan mode and continue interactively. */
+  | "interactive"
+  /** Exit plan mode and continue in autopilot mode. */
+  | "autopilot"
+  /** Exit plan mode and continue in autopilot mode with parallel subagent execution. */
+  | "autopilot_fleet";
 
 /**
  * Parameters for aborting the current turn
@@ -6506,6 +6787,54 @@ export interface SlashCommandTextResult {
    */
   runtimeSettingsChanged?: boolean;
 }
+/**
+ * Schema for the `SlashCommandSelectSubcommandResult` type.
+ *
+ * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
+ * via the `definition` "SlashCommandSelectSubcommandResult".
+ */
+export interface SlashCommandSelectSubcommandResult {
+  /**
+   * Select subcommand result discriminator
+   */
+  kind: "select-subcommand";
+  /**
+   * Parent command name that requires subcommand selection
+   */
+  command: string;
+  /**
+   * Human-readable title for the selection UI
+   */
+  title: string;
+  /**
+   * Available subcommand options for the client to present
+   */
+  options: SlashCommandSelectSubcommandOption[];
+  /**
+   * True when the invocation mutated user runtime settings; consumers caching settings should refresh
+   */
+  runtimeSettingsChanged?: boolean;
+}
+/**
+ * Schema for the `SlashCommandSelectSubcommandOption` type.
+ *
+ * This interface was referenced by `_RpcSchemaRoot`'s JSON-Schema
+ * via the `definition` "SlashCommandSelectSubcommandOption".
+ */
+export interface SlashCommandSelectSubcommandOption {
+  /**
+   * Subcommand name to invoke
+   */
+  name: string;
+  /**
+   * Human-readable description of the subcommand
+   */
+  description: string;
+  /**
+   * Optional group label for organizing options
+   */
+  group?: string;
+}
 /**
  * Schema for the `TaskAgentInfo` type.
  *
@@ -7658,7 +7987,10 @@ export interface WorkspacesGetWorkspaceResult {
     cwd?: string;
     git_root?: string;
     repository?: string;
-    host_type?: "github" | "ado";
+    host_type?: /** Workspace repository is hosted on GitHub. */
+      | "github"
+      /** Workspace repository is hosted on Azure DevOps. */
+      | "ado";
     branch?: string;
     name?: string;
     user_named?: boolean;
diff --git a/nodejs/src/generated/session-events.ts b/nodejs/src/generated/session-events.ts
index 2e501591f..cf376c3db 100644
--- a/nodejs/src/generated/session-events.ts
+++ b/nodejs/src/generated/session-events.ts
@@ -91,35 +91,77 @@ export type SessionEvent =
 /**
  * Hosting platform type of the repository (github or ado)
  */
-export type WorkingDirectoryContextHostType = "github" | "ado";
+export type WorkingDirectoryContextHostType =
+  /** Repository is hosted on GitHub. */
+  | "github"
+  /** Repository is hosted on Azure DevOps. */
+  | "ado";
 /**
  * Reasoning summary mode used for model calls, if applicable (e.g. "none", "concise", "detailed")
  */
-export type ReasoningSummary = "none" | "concise" | "detailed";
+export type ReasoningSummary =
+  /** Do not request reasoning summaries from the model. */
+  | "none"
+  /** Request a concise summary of the model's reasoning. */
+  | "concise"
+  /** Request a detailed summary of the model's reasoning. */
+  | "detailed";
 /**
  * The session mode the agent is operating in
  */
-export type SessionMode = "interactive" | "plan" | "autopilot";
+export type SessionMode =
+  /** The agent is responding interactively to the user. */
+  | "interactive"
+  /** The agent is preparing a plan before making changes. */
+  | "plan"
+  /** The agent is working autonomously toward task completion. */
+  | "autopilot";
 /**
  * The type of operation performed on the plan file
  */
-export type PlanChangedOperation = "create" | "update" | "delete";
+export type PlanChangedOperation =
+  /** The plan file was created. */
+  | "create"
+  /** The plan file was updated. */
+  | "update"
+  /** The plan file was deleted. */
+  | "delete";
 /**
  * Whether the file was newly created or updated
  */
-export type WorkspaceFileChangedOperation = "create" | "update";
+export type WorkspaceFileChangedOperation =
+  /** The workspace file was created. */
+  | "create"
+  /** The workspace file was updated. */
+  | "update";
 /**
  * Origin type of the session being handed off
  */
-export type HandoffSourceType = "remote" | "local";
+export type HandoffSourceType =
+  /** The handoff originated from a remote session. */
+  | "remote"
+  /** The handoff originated from a local session. */
+  | "local";
 /**
  * Whether the session ended normally ("routine") or due to a crash/fatal error ("error")
  */
-export type ShutdownType = "routine" | "error";
+export type ShutdownType =
+  /** The session ended normally. */
+  | "routine"
+  /** The session ended because of a crash or fatal error. */
+  | "error";
 /**
  * The agent mode that was active when this message was sent
  */
-export type UserMessageAgentMode = "interactive" | "plan" | "autopilot" | "shell";
+export type UserMessageAgentMode =
+  /** The agent is responding interactively to the user. */
+  | "interactive"
+  /** The agent is preparing a plan before making changes. */
+  | "plan"
+  /** The agent is working autonomously toward task completion. */
+  | "autopilot"
+  /** The agent is in shell-focused UI mode. */
+  | "shell";
 /**
  * A user message attachment — a file, directory, code selection, blob, or GitHub reference
  */
@@ -132,23 +174,53 @@ export type UserMessageAttachment =
 /**
  * Type of GitHub reference
  */
-export type UserMessageAttachmentGithubReferenceType = "issue" | "pr" | "discussion";
+export type UserMessageAttachmentGithubReferenceType =
+  /** GitHub issue reference. */
+  | "issue"
+  /** GitHub pull request reference. */
+  | "pr"
+  /** GitHub discussion reference. */
+  | "discussion";
 /**
  * Tool call type: "function" for standard tool calls, "custom" for grammar-based tool calls. Defaults to "function" when absent.
  */
-export type AssistantMessageToolRequestType = "function" | "custom";
+export type AssistantMessageToolRequestType =
+  /** Standard function-style tool call. */
+  | "function"
+  /** Custom grammar-based tool call. */
+  | "custom";
 /**
  * API endpoint used for this model call, matching CAPI supported_endpoints vocabulary
  */
-export type AssistantUsageApiEndpoint = "/chat/completions" | "/v1/messages" | "/responses" | "ws:/responses";
+export type AssistantUsageApiEndpoint =
+  /** Chat Completions API endpoint. */
+  | "/chat/completions"
+  /** Anthropic Messages API endpoint. */
+  | "/v1/messages"
+  /** Responses API endpoint. */
+  | "/responses"
+  /** WebSocket Responses API endpoint. */
+  | "ws:/responses";
 /**
  * Where the failed model call originated
  */
-export type ModelCallFailureSource = "top_level" | "subagent" | "mcp_sampling";
+export type ModelCallFailureSource =
+  /** Model call from the top-level agent. */
+  | "top_level"
+  /** Model call from a sub-agent. */
+  | "subagent"
+  /** Model call from MCP sampling. */
+  | "mcp_sampling";
 /**
  * Finite reason code describing why the current turn was aborted
  */
-export type AbortReason = "user_initiated" | "remote_command" | "user_abort";
+export type AbortReason =
+  /** The local user requested the abort, for example by pressing Ctrl+C in the CLI. */
+  | "user_initiated"
+  /** A remote command requested the abort. */
+  | "remote_command"
+  /** An MCP server delivered a user.abort notification. */
+  | "user_abort";
 /**
  * A content block within a tool result, which may be text, terminal output, image, audio, or a resource
  */
@@ -162,7 +234,11 @@ export type ToolExecutionCompleteContent =
 /**
  * Theme variant this icon is intended for
  */
-export type ToolExecutionCompleteContentResourceLinkIconTheme = "light" | "dark";
+export type ToolExecutionCompleteContentResourceLinkIconTheme =
+  /** Icon intended for light themes. */
+  | "light"
+  /** Icon intended for dark themes. */
+  | "dark";
 /**
  * The embedded resource contents, either text or base64-encoded binary
  */
@@ -170,7 +246,11 @@ export type ToolExecutionCompleteContentResourceDetails = EmbeddedTextResourceCo
 /**
  * Message role: "system" for system prompts, "developer" for developer-injected instructions
  */
-export type SystemMessageRole = "system" | "developer";
+export type SystemMessageRole =
+  /** System prompt message. */
+  | "system"
+  /** Developer instruction message. */
+  | "developer";
 /**
  * Structured metadata identifying what triggered this notification
  */
@@ -184,7 +264,11 @@ export type SystemNotification =
 /**
  * Whether the agent completed successfully or failed
  */
-export type SystemNotificationAgentCompletedStatus = "completed" | "failed";
+export type SystemNotificationAgentCompletedStatus =
+  /** The agent completed successfully. */
+  | "completed"
+  /** The agent failed. */
+  | "failed";
 /**
  * Details of the permission being requested
  */
@@ -202,11 +286,19 @@ export type PermissionRequest =
 /**
  * Whether this is a store or vote memory operation
  */
-export type PermissionRequestMemoryAction = "store" | "vote";
+export type PermissionRequestMemoryAction =
+  /** Store a new memory. */
+  | "store"
+  /** Vote on an existing memory. */
+  | "vote";
 /**
  * Vote direction (vote only)
  */
-export type PermissionRequestMemoryDirection = "upvote" | "downvote";
+export type PermissionRequestMemoryDirection =
+  /** Vote that the memory is useful or accurate. */
+  | "upvote"
+  /** Vote that the memory is incorrect or outdated. */
+  | "downvote";
 /**
  * Derived user-facing permission prompt details for UI consumers
  */
@@ -225,7 +317,13 @@ export type PermissionPromptRequest =
 /**
  * Underlying permission kind that needs path approval
  */
-export type PermissionPromptRequestPathAccessKind = "read" | "shell" | "write";
+export type PermissionPromptRequestPathAccessKind =
+  /** Read access to a filesystem path. */
+  | "read"
+  /** Shell command access involving a filesystem path. */
+  | "shell"
+  /** Write access to a filesystem path. */
+  | "write";
 /**
  * The result of the permission request
  */
@@ -254,11 +352,21 @@ export type UserToolSessionApproval =
 /**
  * Elicitation mode; "form" for structured input, "url" for browser-based. Defaults to "form" when absent.
  */
-export type ElicitationRequestedMode = "form" | "url";
+export type ElicitationRequestedMode =
+  /** Structured form-based elicitation. */
+  | "form"
+  /** Browser URL-based elicitation. */
+  | "url";
 /**
  * The user action: "accept" (submitted form), "decline" (explicitly refused), or "cancel" (dismissed)
  */
-export type ElicitationCompletedAction = "accept" | "decline" | "cancel";
+export type ElicitationCompletedAction =
+  /** The user submitted the requested form. */
+  | "accept"
+  /** The user explicitly declined the request. */
+  | "decline"
+  /** The user dismissed the request. */
+  | "cancel";
 /**
  * Schema for the `ElicitationCompletedContent` type.
  */
@@ -278,38 +386,91 @@ export type CustomNotificationPayload =
 /**
  * The user's auto-mode-switch choice
  */
-export type AutoModeSwitchResponse = "yes" | "yes_always" | "no";
+export type AutoModeSwitchResponse =
+  /** Switch models for this request. */
+  | "yes"
+  /** Switch models now and keep using the replacement automatically. */
+  | "yes_always"
+  /** Do not switch models. */
+  | "no";
 /**
  * Exit plan mode action
  */
-export type ExitPlanModeAction = "exit_only" | "interactive" | "autopilot" | "autopilot_fleet";
+export type ExitPlanModeAction =
+  /** Exit plan mode without starting implementation. */
+  | "exit_only"
+  /** Exit plan mode and continue in interactive mode. */
+  | "interactive"
+  /** Exit plan mode and continue autonomously. */
+  | "autopilot"
+  /** Exit plan mode and continue with parallel autonomous workers. */
+  | "autopilot_fleet";
 /**
  * Source location type (e.g., project, personal-copilot, plugin, builtin)
  */
 export type SkillSource =
+  /** Skill defined in the current project's skill directories. */
   | "project"
+  /** Skill discovered from a parent directory in the current workspace tree. */
   | "inherited"
+  /** Skill defined in the user's Copilot skill directory. */
   | "personal-copilot"
+  /** Skill defined in the user's personal agents skill directory. */
   | "personal-agents"
+  /** Skill provided by an installed plugin. */
   | "plugin"
+  /** Skill loaded from a configured custom skill directory. */
   | "custom"
+  /** Skill bundled with the runtime. */
   | "builtin";
 /**
  * Configuration source: user, workspace, plugin, or builtin
  */
-export type McpServerSource = "user" | "workspace" | "plugin" | "builtin";
+export type McpServerSource =
+  /** Server configured in the user's global MCP configuration. */
+  | "user"
+  /** Server configured by the current workspace. */
+  | "workspace"
+  /** Server contributed by an installed plugin. */
+  | "plugin"
+  /** Server bundled with the runtime. */
+  | "builtin";
 /**
  * Connection status: connected, failed, needs-auth, pending, disabled, or not_configured
  */
-export type McpServerStatus = "connected" | "failed" | "needs-auth" | "pending" | "disabled" | "not_configured";
+export type McpServerStatus =
+  /** The server is connected and available. */
+  | "connected"
+  /** The server failed to connect or initialize. */
+  | "failed"
+  /** The server requires authentication before it can connect. */
+  | "needs-auth"
+  /** The server connection is still being established. */
+  | "pending"
+  /** The server is configured but disabled. */
+  | "disabled"
+  /** The server is not configured for this session. */
+  | "not_configured";
 /**
  * Discovery source
  */
-export type ExtensionsLoadedExtensionSource = "project" | "user";
+export type ExtensionsLoadedExtensionSource =
+  /** Extension discovered from the current project. */
+  | "project"
+  /** Extension discovered from the user's extension directory. */
+  | "user";
 /**
  * Current status: running, disabled, failed, or starting
  */
-export type ExtensionsLoadedExtensionStatus = "running" | "disabled" | "failed" | "starting";
+export type ExtensionsLoadedExtensionStatus =
+  /** The extension process is running. */
+  | "running"
+  /** The extension is installed but disabled. */
+  | "disabled"
+  /** The extension failed to start or crashed. */
+  | "failed"
+  /** The extension process is starting. */
+  | "starting";
 
 /**
  * Session event "session.start". Session initialization metadata including context and configuration
@@ -2566,7 +2727,7 @@ export interface AssistantUsageData {
   /**
    * Time to first token in milliseconds. Only available for streaming requests
    */
-  ttftMs?: number;
+  timeToFirstTokenMs?: number;
 }
 /**
  * Per-request cost and usage data from the CAPI copilot_usage response field
diff --git a/python/copilot/generated/rpc.py b/python/copilot/generated/rpc.py
index 6b9e969a7..6a5fcc340 100644
--- a/python/copilot/generated/rpc.py
+++ b/python/copilot/generated/rpc.py
@@ -4823,8 +4823,41 @@ class SlashCommandCompletedResultKind(Enum):
 class SlashCommandInvocationResultKind(Enum):
     AGENT_PROMPT = "agent-prompt"
     COMPLETED = "completed"
+    SELECT_SUBCOMMAND = "select-subcommand"
     TEXT = "text"
 
+@dataclass
+class SlashCommandSelectSubcommandOption:
+    """Schema for the `SlashCommandSelectSubcommandOption` type."""
+
+    description: str
+    """Human-readable description of the subcommand"""
+
+    name: str
+    """Subcommand name to invoke"""
+
+    group: str | None = None
+    """Optional group label for organizing options"""
+
+    @staticmethod
+    def from_dict(obj: Any) -> 'SlashCommandSelectSubcommandOption':
+        assert isinstance(obj, dict)
+        description = from_str(obj.get("description"))
+        name = from_str(obj.get("name"))
+        group = from_union([from_str, from_none], obj.get("group"))
+        return SlashCommandSelectSubcommandOption(description, name, group)
+
+    def to_dict(self) -> dict:
+        result: dict = {}
+        result["description"] = from_str(self.description)
+        result["name"] = from_str(self.name)
+        if self.group is not None:
+            result["group"] = from_union([from_str, from_none], self.group)
+        return result
+
+class SlashCommandSelectSubcommandResultKind(Enum):
+    SELECT_SUBCOMMAND = "select-subcommand"
+
 # Experimental: this type is part of an experimental API and may change or be removed.
 class TaskExecutionMode(Enum):
     """Whether task execution is synchronously awaited or managed in the background"""
@@ -9148,6 +9181,47 @@ def to_dict(self) -> dict:
             result["runtimeSettingsChanged"] = from_union([from_bool, from_none], self.runtime_settings_changed)
         return result
 
+@dataclass
+class SlashCommandSelectSubcommandResult:
+    """Schema for the `SlashCommandSelectSubcommandResult` type."""
+
+    command: str
+    """Parent command name that requires subcommand selection"""
+
+    kind: SlashCommandSelectSubcommandResultKind
+    """Select subcommand result discriminator"""
+
+    options: list[SlashCommandSelectSubcommandOption]
+    """Available subcommand options for the client to present"""
+
+    title: str
+    """Human-readable title for the selection UI"""
+
+    runtime_settings_changed: bool | None = None
+    """True when the invocation mutated user runtime settings; consumers caching settings should
+    refresh
+    """
+
+    @staticmethod
+    def from_dict(obj: Any) -> 'SlashCommandSelectSubcommandResult':
+        assert isinstance(obj, dict)
+        command = from_str(obj.get("command"))
+        kind = SlashCommandSelectSubcommandResultKind(obj.get("kind"))
+        options = from_list(SlashCommandSelectSubcommandOption.from_dict, obj.get("options"))
+        title = from_str(obj.get("title"))
+        runtime_settings_changed = from_union([from_bool, from_none], obj.get("runtimeSettingsChanged"))
+        return SlashCommandSelectSubcommandResult(command, kind, options, title, runtime_settings_changed)
+
+    def to_dict(self) -> dict:
+        result: dict = {}
+        result["command"] = from_str(self.command)
+        result["kind"] = to_enum(SlashCommandSelectSubcommandResultKind, self.kind)
+        result["options"] = from_list(lambda x: to_class(SlashCommandSelectSubcommandOption, x), self.options)
+        result["title"] = from_str(self.title)
+        if self.runtime_settings_changed is not None:
+            result["runtimeSettingsChanged"] = from_union([from_bool, from_none], self.runtime_settings_changed)
+        return result
+
 # Experimental: this type is part of an experimental API and may change or be removed.
 @dataclass
 class TaskAgentProgress:
@@ -11207,6 +11281,8 @@ class SlashCommandInvocationResult:
     Schema for the `SlashCommandAgentPromptResult` type.
 
     Schema for the `SlashCommandCompletedResult` type.
+
+    Schema for the `SlashCommandSelectSubcommandResult` type.
     """
     kind: SlashCommandInvocationResultKind
     """Text result discriminator
@@ -11214,6 +11290,8 @@ class SlashCommandInvocationResult:
     Agent prompt result discriminator
 
     Completed result discriminator
+
+    Select subcommand result discriminator
     """
     markdown: bool | None = None
     """Whether text contains Markdown"""
@@ -11240,6 +11318,15 @@ class SlashCommandInvocationResult:
     message: str | None = None
     """Optional user-facing message describing the completed command"""
 
+    command: str | None = None
+    """Parent command name that requires subcommand selection"""
+
+    options: list[SlashCommandSelectSubcommandOption] | None = None
+    """Available subcommand options for the client to present"""
+
+    title: str | None = None
+    """Human-readable title for the selection UI"""
+
     @staticmethod
     def from_dict(obj: Any) -> 'SlashCommandInvocationResult':
         assert isinstance(obj, dict)
@@ -11252,7 +11339,10 @@ def from_dict(obj: Any) -> 'SlashCommandInvocationResult':
         mode = from_union([SessionMode, from_none], obj.get("mode"))
         prompt = from_union([from_str, from_none], obj.get("prompt"))
         message = from_union([from_str, from_none], obj.get("message"))
-        return SlashCommandInvocationResult(kind, markdown, preserve_ansi, runtime_settings_changed, text, display_prompt, mode, prompt, message)
+        command = from_union([from_str, from_none], obj.get("command"))
+        options = from_union([lambda x: from_list(SlashCommandSelectSubcommandOption.from_dict, x), from_none], obj.get("options"))
+        title = from_union([from_str, from_none], obj.get("title"))
+        return SlashCommandInvocationResult(kind, markdown, preserve_ansi, runtime_settings_changed, text, display_prompt, mode, prompt, message, command, options, title)
 
     def to_dict(self) -> dict:
         result: dict = {}
@@ -11273,6 +11363,12 @@ def to_dict(self) -> dict:
             result["prompt"] = from_union([from_str, from_none], self.prompt)
         if self.message is not None:
             result["message"] = from_union([from_str, from_none], self.message)
+        if self.command is not None:
+            result["command"] = from_union([from_str, from_none], self.command)
+        if self.options is not None:
+            result["options"] = from_union([lambda x: from_list(lambda x: to_class(SlashCommandSelectSubcommandOption, x), x), from_none], self.options)
+        if self.title is not None:
+            result["title"] = from_union([from_str, from_none], self.title)
         return result
 
 # Experimental: this type is part of an experimental API and may change or be removed.
@@ -14418,6 +14514,8 @@ class RPC:
     slash_command_input_completion: SlashCommandInputCompletion
     slash_command_invocation_result: SlashCommandInvocationResult
     slash_command_kind: SlashCommandKind
+    slash_command_select_subcommand_option: SlashCommandSelectSubcommandOption
+    slash_command_select_subcommand_result: SlashCommandSelectSubcommandResult
     slash_command_text_result: SlashCommandTextResult
     task_agent_info: TaskAgentInfo
     task_agent_progress: TaskAgentProgress
@@ -14907,6 +15005,8 @@ def from_dict(obj: Any) -> 'RPC':
         slash_command_input_completion = SlashCommandInputCompletion(obj.get("SlashCommandInputCompletion"))
         slash_command_invocation_result = SlashCommandInvocationResult.from_dict(obj.get("SlashCommandInvocationResult"))
         slash_command_kind = SlashCommandKind(obj.get("SlashCommandKind"))
+        slash_command_select_subcommand_option = SlashCommandSelectSubcommandOption.from_dict(obj.get("SlashCommandSelectSubcommandOption"))
+        slash_command_select_subcommand_result = SlashCommandSelectSubcommandResult.from_dict(obj.get("SlashCommandSelectSubcommandResult"))
         slash_command_text_result = SlashCommandTextResult.from_dict(obj.get("SlashCommandTextResult"))
         task_agent_info = TaskAgentInfo.from_dict(obj.get("TaskAgentInfo"))
         task_agent_progress = TaskAgentProgress.from_dict(obj.get("TaskAgentProgress"))
@@ -15004,7 +15104,7 @@ def from_dict(obj: Any) -> 'RPC':
         session_context_info = from_union([SessionContextInfo.from_dict, from_none], obj.get("SessionContextInfo"))
         task_progress = from_union([TaskProgressClass.from_dict, from_none], obj.get("TaskProgress"))
         workspace_summary = from_union([WorkspaceSummary.from_dict, from_none], obj.get("WorkspaceSummary"))
-        return RPC(abort_request, abort_result, account_get_quota_request, account_get_quota_result, account_quota_snapshot, agent_get_current_result, agent_info, agent_info_source, agent_list, agent_reload_result, agent_select_request, agent_select_result, api_key_auth_info, auth_info, auth_info_type, command_list, commands_handle_pending_command_request, commands_handle_pending_command_result, commands_invoke_request, commands_list_request, commands_respond_to_queued_command_request, commands_respond_to_queued_command_result, connected_remote_session_metadata, connected_remote_session_metadata_kind, connected_remote_session_metadata_repository, connect_remote_session_params, connect_request, connect_result, content_filter_mode, copilot_api_token_auth_info, copilot_user_response, copilot_user_response_endpoints, copilot_user_response_quota_snapshots, copilot_user_response_quota_snapshots_chat, copilot_user_response_quota_snapshots_completions, copilot_user_response_quota_snapshots_premium_interactions, current_model, discovered_mcp_server, discovered_mcp_server_type, enqueue_command_params, enqueue_command_result, env_auth_info, event_log_read_request, event_log_release_interest_result, event_log_tail_result, event_log_types, events_agent_scope, events_cursor_status, events_read_result, execute_command_params, execute_command_result, extension, extension_list, extensions_disable_request, extensions_enable_request, extension_source, extension_status, external_tool_result, external_tool_text_result_for_llm, external_tool_text_result_for_llm_binary_results_for_llm, external_tool_text_result_for_llm_binary_results_for_llm_type, external_tool_text_result_for_llm_content, external_tool_text_result_for_llm_content_audio, external_tool_text_result_for_llm_content_image, external_tool_text_result_for_llm_content_resource, external_tool_text_result_for_llm_content_resource_details, external_tool_text_result_for_llm_content_resource_link, external_tool_text_result_for_llm_content_resource_link_icon, external_tool_text_result_for_llm_content_resource_link_icon_theme, external_tool_text_result_for_llm_content_terminal, external_tool_text_result_for_llm_content_text, filter_mapping, fleet_start_request, fleet_start_result, gh_cli_auth_info, handle_pending_tool_call_request, handle_pending_tool_call_result, history_abort_manual_compaction_result, history_cancel_background_compaction_result, history_compact_context_window, history_compact_result, history_summarize_for_handoff_result, history_truncate_request, history_truncate_result, hmac_auth_info, installed_plugin, installed_plugin_source, installed_plugin_source_github, installed_plugin_source_local, installed_plugin_source_url, instructions_get_sources_result, instructions_sources, instructions_sources_location, instructions_sources_type, log_request, log_result, lsp_initialize_request, mcp_cancel_sampling_execution_params, mcp_cancel_sampling_execution_result, mcp_config_add_request, mcp_config_disable_request, mcp_config_enable_request, mcp_config_list, mcp_config_remove_request, mcp_config_update_request, mcp_disable_request, mcp_discover_request, mcp_discover_result, mcp_enable_request, mcp_execute_sampling_params, mcp_execute_sampling_request, mcp_execute_sampling_result, mcp_oauth_login_request, mcp_oauth_login_result, mcp_remove_git_hub_result, mcp_sampling_execution_action, mcp_sampling_execution_result, mcp_server, mcp_server_config, mcp_server_config_http, mcp_server_config_http_auth, mcp_server_config_http_oauth_grant_type, mcp_server_config_http_type, mcp_server_config_stdio, mcp_server_list, mcp_set_env_value_mode_details, mcp_set_env_value_mode_params, mcp_set_env_value_mode_result, metadata_context_info_request, metadata_context_info_result, metadata_is_processing_result, metadata_recompute_context_tokens_request, metadata_recompute_context_tokens_result, metadata_record_context_change_request, metadata_record_context_change_result, metadata_set_working_directory_request, metadata_set_working_directory_result, metadata_snapshot_current_mode, metadata_snapshot_remote_metadata, metadata_snapshot_remote_metadata_repository, metadata_snapshot_remote_metadata_task_type, model, model_billing, model_billing_token_prices, model_capabilities, model_capabilities_limits, model_capabilities_limits_vision, model_capabilities_override, model_capabilities_override_limits, model_capabilities_override_limits_vision, model_capabilities_override_supports, model_capabilities_supports, model_list, model_picker_category, model_picker_price_category, model_policy, model_policy_state, model_set_reasoning_effort_request, model_set_reasoning_effort_result, models_list_request, model_switch_to_request, model_switch_to_result, mode_set_request, name_get_result, name_set_auto_request, name_set_auto_result, name_set_request, options_update_env_value_mode, pending_permission_request, pending_permission_request_list, permission_decision, permission_decision_approved, permission_decision_approved_for_location, permission_decision_approved_for_session, permission_decision_approve_for_location, permission_decision_approve_for_location_approval, permission_decision_approve_for_location_approval_commands, permission_decision_approve_for_location_approval_custom_tool, permission_decision_approve_for_location_approval_extension_management, permission_decision_approve_for_location_approval_extension_permission_access, permission_decision_approve_for_location_approval_mcp, permission_decision_approve_for_location_approval_mcp_sampling, permission_decision_approve_for_location_approval_memory, permission_decision_approve_for_location_approval_read, permission_decision_approve_for_location_approval_write, permission_decision_approve_for_session, permission_decision_approve_for_session_approval, permission_decision_approve_for_session_approval_commands, permission_decision_approve_for_session_approval_custom_tool, permission_decision_approve_for_session_approval_extension_management, permission_decision_approve_for_session_approval_extension_permission_access, permission_decision_approve_for_session_approval_mcp, permission_decision_approve_for_session_approval_mcp_sampling, permission_decision_approve_for_session_approval_memory, permission_decision_approve_for_session_approval_read, permission_decision_approve_for_session_approval_write, permission_decision_approve_once, permission_decision_approve_permanently, permission_decision_cancelled, permission_decision_denied_by_content_exclusion_policy, permission_decision_denied_by_permission_request_hook, permission_decision_denied_by_rules, permission_decision_denied_interactively_by_user, permission_decision_denied_no_approval_rule_and_could_not_request_from_user, permission_decision_reject, permission_decision_request, permission_decision_user_not_available, permission_paths_add_params, permission_paths_allowed_check_params, permission_paths_allowed_check_result, permission_paths_config, permission_paths_list, permission_paths_update_primary_params, permission_paths_workspace_check_params, permission_paths_workspace_check_result, permission_prompt_shown_notification, permission_request_result, permission_rules_set, permissions_configure_additional_content_exclusion_policy, permissions_configure_additional_content_exclusion_policy_rule, permissions_configure_additional_content_exclusion_policy_rule_source, permissions_configure_additional_content_exclusion_policy_scope, permissions_configure_params, permissions_configure_result, permissions_modify_rules_params, permissions_modify_rules_result, permissions_modify_rules_scope, permissions_notify_prompt_shown_result, permissions_paths_add_result, permissions_paths_list_request, permissions_paths_update_primary_result, permissions_pending_requests_request, permissions_reset_session_approvals_request, permissions_reset_session_approvals_result, permissions_set_approve_all_request, permissions_set_approve_all_result, permissions_set_approve_all_source, permissions_set_required_request, permissions_set_required_result, permissions_urls_set_unrestricted_mode_result, permission_urls_config, permission_urls_set_unrestricted_mode_params, ping_request, ping_result, plan_read_result, plan_update_request, plugin, plugin_list, queued_command_handled, queued_command_not_handled, queued_command_result, queue_pending_items, queue_pending_items_kind, queue_pending_items_result, queue_remove_most_recent_result, register_event_interest_params, register_event_interest_result, release_event_interest_params, remote_enable_request, remote_enable_result, remote_notify_steerable_changed_request, remote_notify_steerable_changed_result, remote_session_connection_result, remote_session_mode, schedule_entry, schedule_list, schedule_stop_request, schedule_stop_result, send_agent_mode, send_attachment, send_attachment_blob, send_attachment_directory, send_attachment_file, send_attachment_file_line_range, send_attachment_github_reference, send_attachment_github_reference_type, send_attachment_selection, send_attachment_selection_details, send_attachment_selection_details_end, send_attachment_selection_details_start, send_mode, send_request, send_result, server_skill, server_skill_list, session_auth_status, session_bulk_delete_result, session_context, session_context_host_type, session_enrich_metadata_result, session_fs_append_file_request, session_fs_error, session_fs_error_code, session_fs_exists_request, session_fs_exists_result, session_fs_mkdir_request, session_fs_readdir_request, session_fs_readdir_result, session_fs_readdir_with_types_entry, session_fs_readdir_with_types_entry_type, session_fs_readdir_with_types_request, session_fs_readdir_with_types_result, session_fs_read_file_request, session_fs_read_file_result, session_fs_rename_request, session_fs_rm_request, session_fs_set_provider_capabilities, session_fs_set_provider_conventions, session_fs_set_provider_request, session_fs_set_provider_result, session_fs_sqlite_exists_request, session_fs_sqlite_exists_result, session_fs_sqlite_query_request, session_fs_sqlite_query_result, session_fs_sqlite_query_type, session_fs_stat_request, session_fs_stat_result, session_fs_write_file_request, session_installed_plugin, session_installed_plugin_source, session_installed_plugin_source_github, session_installed_plugin_source_local, session_installed_plugin_source_url, session_list, session_load_deferred_repo_hooks_result, session_log_level, session_metadata, session_metadata_snapshot, session_mode, session_prune_result, sessions_bulk_delete_request, sessions_check_in_use_request, sessions_check_in_use_result, sessions_close_request, sessions_close_result, sessions_enrich_metadata_request, session_set_credentials_params, session_set_credentials_result, sessions_find_by_prefix_request, sessions_find_by_prefix_result, sessions_find_by_task_id_request, sessions_find_by_task_id_result, sessions_fork_request, sessions_fork_result, sessions_get_event_file_path_request, sessions_get_event_file_path_result, sessions_get_last_for_context_request, sessions_get_last_for_context_result, sessions_get_persisted_remote_steerable_request, sessions_get_persisted_remote_steerable_result, session_sizes, sessions_list_request, sessions_load_deferred_repo_hooks_request, sessions_prune_old_request, sessions_release_lock_request, sessions_release_lock_result, sessions_reload_plugin_hooks_request, sessions_reload_plugin_hooks_result, sessions_save_request, sessions_save_result, sessions_set_additional_plugins_request, sessions_set_additional_plugins_result, session_update_options_params, session_update_options_result, session_working_directory_context, session_working_directory_context_host_type, shell_exec_request, shell_exec_result, shell_kill_request, shell_kill_result, shell_kill_signal, shutdown_request, skill, skill_list, skills_config_set_disabled_skills_request, skills_disable_request, skills_discover_request, skills_enable_request, skills_get_invoked_result, skills_invoked_skill, skills_load_diagnostics, slash_command_agent_prompt_result, slash_command_completed_result, slash_command_info, slash_command_input, slash_command_input_completion, slash_command_invocation_result, slash_command_kind, slash_command_text_result, task_agent_info, task_agent_progress, task_execution_mode, task_info, task_list, tasks_cancel_request, tasks_cancel_result, tasks_get_current_promotable_result, tasks_get_progress_request, tasks_get_progress_result, task_shell_info, task_shell_info_attachment_mode, task_shell_progress, tasks_promote_current_to_background_result, tasks_promote_to_background_request, tasks_promote_to_background_result, tasks_refresh_result, tasks_remove_request, tasks_remove_result, tasks_send_message_request, tasks_send_message_result, tasks_start_agent_request, tasks_start_agent_result, task_status, tasks_wait_for_pending_result, telemetry_set_feature_overrides_request, token_auth_info, tool, tool_list, tools_initialize_and_validate_result, tools_list_request, ui_auto_mode_switch_response, ui_elicitation_array_any_of_field, ui_elicitation_array_any_of_field_items, ui_elicitation_array_any_of_field_items_any_of, ui_elicitation_array_enum_field, ui_elicitation_array_enum_field_items, ui_elicitation_field_value, ui_elicitation_request, ui_elicitation_response, ui_elicitation_response_action, ui_elicitation_response_content, ui_elicitation_result, ui_elicitation_schema, ui_elicitation_schema_property, ui_elicitation_schema_property_boolean, ui_elicitation_schema_property_number, ui_elicitation_schema_property_number_type, ui_elicitation_schema_property_string, ui_elicitation_schema_property_string_format, ui_elicitation_string_enum_field, ui_elicitation_string_one_of_field, ui_elicitation_string_one_of_field_one_of, ui_exit_plan_mode_action, ui_exit_plan_mode_response, ui_handle_pending_auto_mode_switch_request, ui_handle_pending_elicitation_request, ui_handle_pending_exit_plan_mode_request, ui_handle_pending_result, ui_handle_pending_sampling_request, ui_handle_pending_sampling_response, ui_handle_pending_user_input_request, ui_register_direct_auto_mode_switch_handler_result, ui_unregister_direct_auto_mode_switch_handler_request, ui_unregister_direct_auto_mode_switch_handler_result, ui_user_input_response, usage_get_metrics_result, usage_metrics_code_changes, usage_metrics_model_metric, usage_metrics_model_metric_requests, usage_metrics_model_metric_token_detail, usage_metrics_model_metric_usage, usage_metrics_token_detail, user_auth_info, user_tool_session_approval_commands, user_tool_session_approval_custom_tool, user_tool_session_approval_extension_management, user_tool_session_approval_extension_permission_access, user_tool_session_approval_mcp, user_tool_session_approval_memory, user_tool_session_approval_read, user_tool_session_approval_write, workspaces_checkpoints, workspaces_create_file_request, workspaces_get_workspace_result, workspaces_list_checkpoints_result, workspaces_list_files_result, workspaces_read_checkpoint_request, workspaces_read_checkpoint_result, workspaces_read_file_request, workspaces_read_file_result, workspaces_save_large_paste_request, workspaces_save_large_paste_result, session_context_info, task_progress, workspace_summary)
+        return RPC(abort_request, abort_result, account_get_quota_request, account_get_quota_result, account_quota_snapshot, agent_get_current_result, agent_info, agent_info_source, agent_list, agent_reload_result, agent_select_request, agent_select_result, api_key_auth_info, auth_info, auth_info_type, command_list, commands_handle_pending_command_request, commands_handle_pending_command_result, commands_invoke_request, commands_list_request, commands_respond_to_queued_command_request, commands_respond_to_queued_command_result, connected_remote_session_metadata, connected_remote_session_metadata_kind, connected_remote_session_metadata_repository, connect_remote_session_params, connect_request, connect_result, content_filter_mode, copilot_api_token_auth_info, copilot_user_response, copilot_user_response_endpoints, copilot_user_response_quota_snapshots, copilot_user_response_quota_snapshots_chat, copilot_user_response_quota_snapshots_completions, copilot_user_response_quota_snapshots_premium_interactions, current_model, discovered_mcp_server, discovered_mcp_server_type, enqueue_command_params, enqueue_command_result, env_auth_info, event_log_read_request, event_log_release_interest_result, event_log_tail_result, event_log_types, events_agent_scope, events_cursor_status, events_read_result, execute_command_params, execute_command_result, extension, extension_list, extensions_disable_request, extensions_enable_request, extension_source, extension_status, external_tool_result, external_tool_text_result_for_llm, external_tool_text_result_for_llm_binary_results_for_llm, external_tool_text_result_for_llm_binary_results_for_llm_type, external_tool_text_result_for_llm_content, external_tool_text_result_for_llm_content_audio, external_tool_text_result_for_llm_content_image, external_tool_text_result_for_llm_content_resource, external_tool_text_result_for_llm_content_resource_details, external_tool_text_result_for_llm_content_resource_link, external_tool_text_result_for_llm_content_resource_link_icon, external_tool_text_result_for_llm_content_resource_link_icon_theme, external_tool_text_result_for_llm_content_terminal, external_tool_text_result_for_llm_content_text, filter_mapping, fleet_start_request, fleet_start_result, gh_cli_auth_info, handle_pending_tool_call_request, handle_pending_tool_call_result, history_abort_manual_compaction_result, history_cancel_background_compaction_result, history_compact_context_window, history_compact_result, history_summarize_for_handoff_result, history_truncate_request, history_truncate_result, hmac_auth_info, installed_plugin, installed_plugin_source, installed_plugin_source_github, installed_plugin_source_local, installed_plugin_source_url, instructions_get_sources_result, instructions_sources, instructions_sources_location, instructions_sources_type, log_request, log_result, lsp_initialize_request, mcp_cancel_sampling_execution_params, mcp_cancel_sampling_execution_result, mcp_config_add_request, mcp_config_disable_request, mcp_config_enable_request, mcp_config_list, mcp_config_remove_request, mcp_config_update_request, mcp_disable_request, mcp_discover_request, mcp_discover_result, mcp_enable_request, mcp_execute_sampling_params, mcp_execute_sampling_request, mcp_execute_sampling_result, mcp_oauth_login_request, mcp_oauth_login_result, mcp_remove_git_hub_result, mcp_sampling_execution_action, mcp_sampling_execution_result, mcp_server, mcp_server_config, mcp_server_config_http, mcp_server_config_http_auth, mcp_server_config_http_oauth_grant_type, mcp_server_config_http_type, mcp_server_config_stdio, mcp_server_list, mcp_set_env_value_mode_details, mcp_set_env_value_mode_params, mcp_set_env_value_mode_result, metadata_context_info_request, metadata_context_info_result, metadata_is_processing_result, metadata_recompute_context_tokens_request, metadata_recompute_context_tokens_result, metadata_record_context_change_request, metadata_record_context_change_result, metadata_set_working_directory_request, metadata_set_working_directory_result, metadata_snapshot_current_mode, metadata_snapshot_remote_metadata, metadata_snapshot_remote_metadata_repository, metadata_snapshot_remote_metadata_task_type, model, model_billing, model_billing_token_prices, model_capabilities, model_capabilities_limits, model_capabilities_limits_vision, model_capabilities_override, model_capabilities_override_limits, model_capabilities_override_limits_vision, model_capabilities_override_supports, model_capabilities_supports, model_list, model_picker_category, model_picker_price_category, model_policy, model_policy_state, model_set_reasoning_effort_request, model_set_reasoning_effort_result, models_list_request, model_switch_to_request, model_switch_to_result, mode_set_request, name_get_result, name_set_auto_request, name_set_auto_result, name_set_request, options_update_env_value_mode, pending_permission_request, pending_permission_request_list, permission_decision, permission_decision_approved, permission_decision_approved_for_location, permission_decision_approved_for_session, permission_decision_approve_for_location, permission_decision_approve_for_location_approval, permission_decision_approve_for_location_approval_commands, permission_decision_approve_for_location_approval_custom_tool, permission_decision_approve_for_location_approval_extension_management, permission_decision_approve_for_location_approval_extension_permission_access, permission_decision_approve_for_location_approval_mcp, permission_decision_approve_for_location_approval_mcp_sampling, permission_decision_approve_for_location_approval_memory, permission_decision_approve_for_location_approval_read, permission_decision_approve_for_location_approval_write, permission_decision_approve_for_session, permission_decision_approve_for_session_approval, permission_decision_approve_for_session_approval_commands, permission_decision_approve_for_session_approval_custom_tool, permission_decision_approve_for_session_approval_extension_management, permission_decision_approve_for_session_approval_extension_permission_access, permission_decision_approve_for_session_approval_mcp, permission_decision_approve_for_session_approval_mcp_sampling, permission_decision_approve_for_session_approval_memory, permission_decision_approve_for_session_approval_read, permission_decision_approve_for_session_approval_write, permission_decision_approve_once, permission_decision_approve_permanently, permission_decision_cancelled, permission_decision_denied_by_content_exclusion_policy, permission_decision_denied_by_permission_request_hook, permission_decision_denied_by_rules, permission_decision_denied_interactively_by_user, permission_decision_denied_no_approval_rule_and_could_not_request_from_user, permission_decision_reject, permission_decision_request, permission_decision_user_not_available, permission_paths_add_params, permission_paths_allowed_check_params, permission_paths_allowed_check_result, permission_paths_config, permission_paths_list, permission_paths_update_primary_params, permission_paths_workspace_check_params, permission_paths_workspace_check_result, permission_prompt_shown_notification, permission_request_result, permission_rules_set, permissions_configure_additional_content_exclusion_policy, permissions_configure_additional_content_exclusion_policy_rule, permissions_configure_additional_content_exclusion_policy_rule_source, permissions_configure_additional_content_exclusion_policy_scope, permissions_configure_params, permissions_configure_result, permissions_modify_rules_params, permissions_modify_rules_result, permissions_modify_rules_scope, permissions_notify_prompt_shown_result, permissions_paths_add_result, permissions_paths_list_request, permissions_paths_update_primary_result, permissions_pending_requests_request, permissions_reset_session_approvals_request, permissions_reset_session_approvals_result, permissions_set_approve_all_request, permissions_set_approve_all_result, permissions_set_approve_all_source, permissions_set_required_request, permissions_set_required_result, permissions_urls_set_unrestricted_mode_result, permission_urls_config, permission_urls_set_unrestricted_mode_params, ping_request, ping_result, plan_read_result, plan_update_request, plugin, plugin_list, queued_command_handled, queued_command_not_handled, queued_command_result, queue_pending_items, queue_pending_items_kind, queue_pending_items_result, queue_remove_most_recent_result, register_event_interest_params, register_event_interest_result, release_event_interest_params, remote_enable_request, remote_enable_result, remote_notify_steerable_changed_request, remote_notify_steerable_changed_result, remote_session_connection_result, remote_session_mode, schedule_entry, schedule_list, schedule_stop_request, schedule_stop_result, send_agent_mode, send_attachment, send_attachment_blob, send_attachment_directory, send_attachment_file, send_attachment_file_line_range, send_attachment_github_reference, send_attachment_github_reference_type, send_attachment_selection, send_attachment_selection_details, send_attachment_selection_details_end, send_attachment_selection_details_start, send_mode, send_request, send_result, server_skill, server_skill_list, session_auth_status, session_bulk_delete_result, session_context, session_context_host_type, session_enrich_metadata_result, session_fs_append_file_request, session_fs_error, session_fs_error_code, session_fs_exists_request, session_fs_exists_result, session_fs_mkdir_request, session_fs_readdir_request, session_fs_readdir_result, session_fs_readdir_with_types_entry, session_fs_readdir_with_types_entry_type, session_fs_readdir_with_types_request, session_fs_readdir_with_types_result, session_fs_read_file_request, session_fs_read_file_result, session_fs_rename_request, session_fs_rm_request, session_fs_set_provider_capabilities, session_fs_set_provider_conventions, session_fs_set_provider_request, session_fs_set_provider_result, session_fs_sqlite_exists_request, session_fs_sqlite_exists_result, session_fs_sqlite_query_request, session_fs_sqlite_query_result, session_fs_sqlite_query_type, session_fs_stat_request, session_fs_stat_result, session_fs_write_file_request, session_installed_plugin, session_installed_plugin_source, session_installed_plugin_source_github, session_installed_plugin_source_local, session_installed_plugin_source_url, session_list, session_load_deferred_repo_hooks_result, session_log_level, session_metadata, session_metadata_snapshot, session_mode, session_prune_result, sessions_bulk_delete_request, sessions_check_in_use_request, sessions_check_in_use_result, sessions_close_request, sessions_close_result, sessions_enrich_metadata_request, session_set_credentials_params, session_set_credentials_result, sessions_find_by_prefix_request, sessions_find_by_prefix_result, sessions_find_by_task_id_request, sessions_find_by_task_id_result, sessions_fork_request, sessions_fork_result, sessions_get_event_file_path_request, sessions_get_event_file_path_result, sessions_get_last_for_context_request, sessions_get_last_for_context_result, sessions_get_persisted_remote_steerable_request, sessions_get_persisted_remote_steerable_result, session_sizes, sessions_list_request, sessions_load_deferred_repo_hooks_request, sessions_prune_old_request, sessions_release_lock_request, sessions_release_lock_result, sessions_reload_plugin_hooks_request, sessions_reload_plugin_hooks_result, sessions_save_request, sessions_save_result, sessions_set_additional_plugins_request, sessions_set_additional_plugins_result, session_update_options_params, session_update_options_result, session_working_directory_context, session_working_directory_context_host_type, shell_exec_request, shell_exec_result, shell_kill_request, shell_kill_result, shell_kill_signal, shutdown_request, skill, skill_list, skills_config_set_disabled_skills_request, skills_disable_request, skills_discover_request, skills_enable_request, skills_get_invoked_result, skills_invoked_skill, skills_load_diagnostics, slash_command_agent_prompt_result, slash_command_completed_result, slash_command_info, slash_command_input, slash_command_input_completion, slash_command_invocation_result, slash_command_kind, slash_command_select_subcommand_option, slash_command_select_subcommand_result, slash_command_text_result, task_agent_info, task_agent_progress, task_execution_mode, task_info, task_list, tasks_cancel_request, tasks_cancel_result, tasks_get_current_promotable_result, tasks_get_progress_request, tasks_get_progress_result, task_shell_info, task_shell_info_attachment_mode, task_shell_progress, tasks_promote_current_to_background_result, tasks_promote_to_background_request, tasks_promote_to_background_result, tasks_refresh_result, tasks_remove_request, tasks_remove_result, tasks_send_message_request, tasks_send_message_result, tasks_start_agent_request, tasks_start_agent_result, task_status, tasks_wait_for_pending_result, telemetry_set_feature_overrides_request, token_auth_info, tool, tool_list, tools_initialize_and_validate_result, tools_list_request, ui_auto_mode_switch_response, ui_elicitation_array_any_of_field, ui_elicitation_array_any_of_field_items, ui_elicitation_array_any_of_field_items_any_of, ui_elicitation_array_enum_field, ui_elicitation_array_enum_field_items, ui_elicitation_field_value, ui_elicitation_request, ui_elicitation_response, ui_elicitation_response_action, ui_elicitation_response_content, ui_elicitation_result, ui_elicitation_schema, ui_elicitation_schema_property, ui_elicitation_schema_property_boolean, ui_elicitation_schema_property_number, ui_elicitation_schema_property_number_type, ui_elicitation_schema_property_string, ui_elicitation_schema_property_string_format, ui_elicitation_string_enum_field, ui_elicitation_string_one_of_field, ui_elicitation_string_one_of_field_one_of, ui_exit_plan_mode_action, ui_exit_plan_mode_response, ui_handle_pending_auto_mode_switch_request, ui_handle_pending_elicitation_request, ui_handle_pending_exit_plan_mode_request, ui_handle_pending_result, ui_handle_pending_sampling_request, ui_handle_pending_sampling_response, ui_handle_pending_user_input_request, ui_register_direct_auto_mode_switch_handler_result, ui_unregister_direct_auto_mode_switch_handler_request, ui_unregister_direct_auto_mode_switch_handler_result, ui_user_input_response, usage_get_metrics_result, usage_metrics_code_changes, usage_metrics_model_metric, usage_metrics_model_metric_requests, usage_metrics_model_metric_token_detail, usage_metrics_model_metric_usage, usage_metrics_token_detail, user_auth_info, user_tool_session_approval_commands, user_tool_session_approval_custom_tool, user_tool_session_approval_extension_management, user_tool_session_approval_extension_permission_access, user_tool_session_approval_mcp, user_tool_session_approval_memory, user_tool_session_approval_read, user_tool_session_approval_write, workspaces_checkpoints, workspaces_create_file_request, workspaces_get_workspace_result, workspaces_list_checkpoints_result, workspaces_list_files_result, workspaces_read_checkpoint_request, workspaces_read_checkpoint_result, workspaces_read_file_request, workspaces_read_file_result, workspaces_save_large_paste_request, workspaces_save_large_paste_result, session_context_info, task_progress, workspace_summary)
 
     def to_dict(self) -> dict:
         result: dict = {}
@@ -15396,6 +15496,8 @@ def to_dict(self) -> dict:
         result["SlashCommandInputCompletion"] = to_enum(SlashCommandInputCompletion, self.slash_command_input_completion)
         result["SlashCommandInvocationResult"] = to_class(SlashCommandInvocationResult, self.slash_command_invocation_result)
         result["SlashCommandKind"] = to_enum(SlashCommandKind, self.slash_command_kind)
+        result["SlashCommandSelectSubcommandOption"] = to_class(SlashCommandSelectSubcommandOption, self.slash_command_select_subcommand_option)
+        result["SlashCommandSelectSubcommandResult"] = to_class(SlashCommandSelectSubcommandResult, self.slash_command_select_subcommand_result)
         result["SlashCommandTextResult"] = to_class(SlashCommandTextResult, self.slash_command_text_result)
         result["TaskAgentInfo"] = to_class(TaskAgentInfo, self.task_agent_info)
         result["TaskAgentProgress"] = to_class(TaskAgentProgress, self.task_agent_progress)
diff --git a/python/copilot/generated/session_events.py b/python/copilot/generated/session_events.py
index ab9605546..83d9cb9ed 100644
--- a/python/copilot/generated/session_events.py
+++ b/python/copilot/generated/session_events.py
@@ -693,7 +693,7 @@ class AssistantUsageData:
     quota_snapshots: dict[str, AssistantUsageQuotaSnapshot] | None = None
     reasoning_effort: str | None = None
     reasoning_tokens: int | None = None
-    ttft: timedelta | None = None
+    time_to_first_token: timedelta | None = None
 
     @staticmethod
     def from_dict(obj: Any) -> "AssistantUsageData":
@@ -715,7 +715,7 @@ def from_dict(obj: Any) -> "AssistantUsageData":
         quota_snapshots = from_union([from_none, lambda x: from_dict(AssistantUsageQuotaSnapshot.from_dict, x)], obj.get("quotaSnapshots"))
         reasoning_effort = from_union([from_none, from_str], obj.get("reasoningEffort"))
         reasoning_tokens = from_union([from_none, from_int], obj.get("reasoningTokens"))
-        ttft = from_union([from_none, from_timedelta], obj.get("ttftMs"))
+        time_to_first_token = from_union([from_none, from_timedelta], obj.get("timeToFirstTokenMs"))
         return AssistantUsageData(
             model=model,
             api_call_id=api_call_id,
@@ -734,7 +734,7 @@ def from_dict(obj: Any) -> "AssistantUsageData":
             quota_snapshots=quota_snapshots,
             reasoning_effort=reasoning_effort,
             reasoning_tokens=reasoning_tokens,
-            ttft=ttft,
+            time_to_first_token=time_to_first_token,
         )
 
     def to_dict(self) -> dict:
@@ -772,8 +772,8 @@ def to_dict(self) -> dict:
             result["reasoningEffort"] = from_union([from_none, from_str], self.reasoning_effort)
         if self.reasoning_tokens is not None:
             result["reasoningTokens"] = from_union([from_none, to_int], self.reasoning_tokens)
-        if self.ttft is not None:
-            result["ttftMs"] = from_union([from_none, to_timedelta_int], self.ttft)
+        if self.time_to_first_token is not None:
+            result["timeToFirstTokenMs"] = from_union([from_none, to_timedelta_int], self.time_to_first_token)
         return result
 
 
@@ -4829,95 +4829,137 @@ def to_dict(self) -> dict:
 
 class AbortReason(Enum):
     "Finite reason code describing why the current turn was aborted"
+    # The local user requested the abort, for example by pressing Ctrl+C in the CLI.
     USER_INITIATED = "user_initiated"
+    # A remote command requested the abort.
     REMOTE_COMMAND = "remote_command"
+    # An MCP server delivered a user.abort notification.
     USER_ABORT = "user_abort"
 
 
 class AssistantMessageToolRequestType(Enum):
     "Tool call type: \"function\" for standard tool calls, \"custom\" for grammar-based tool calls. Defaults to \"function\" when absent."
+    # Standard function-style tool call.
     FUNCTION = "function"
+    # Custom grammar-based tool call.
     CUSTOM = "custom"
 
 
 class AssistantUsageApiEndpoint(Enum):
     "API endpoint used for this model call, matching CAPI supported_endpoints vocabulary"
+    # Chat Completions API endpoint.
     CHAT_COMPLETIONS = "/chat/completions"
+    # Anthropic Messages API endpoint.
     V1_MESSAGES = "/v1/messages"
+    # Responses API endpoint.
     RESPONSES = "/responses"
+    # WebSocket Responses API endpoint.
     WS_RESPONSES = "ws:/responses"
 
 
 class AutoModeSwitchResponse(Enum):
     "The user's auto-mode-switch choice"
+    # Switch models for this request.
     YES = "yes"
+    # Switch models now and keep using the replacement automatically.
     YES_ALWAYS = "yes_always"
+    # Do not switch models.
     NO = "no"
 
 
 class ElicitationCompletedAction(Enum):
     "The user action: \"accept\" (submitted form), \"decline\" (explicitly refused), or \"cancel\" (dismissed)"
+    # The user submitted the requested form.
     ACCEPT = "accept"
+    # The user explicitly declined the request.
     DECLINE = "decline"
+    # The user dismissed the request.
     CANCEL = "cancel"
 
 
 class ElicitationRequestedMode(Enum):
     "Elicitation mode; \"form\" for structured input, \"url\" for browser-based. Defaults to \"form\" when absent."
+    # Structured form-based elicitation.
     FORM = "form"
+    # Browser URL-based elicitation.
     URL = "url"
 
 
 class ExitPlanModeAction(Enum):
     "Exit plan mode action"
+    # Exit plan mode without starting implementation.
     EXIT_ONLY = "exit_only"
+    # Exit plan mode and continue in interactive mode.
     INTERACTIVE = "interactive"
+    # Exit plan mode and continue autonomously.
     AUTOPILOT = "autopilot"
+    # Exit plan mode and continue with parallel autonomous workers.
     AUTOPILOT_FLEET = "autopilot_fleet"
 
 
 class ExtensionsLoadedExtensionSource(Enum):
     "Discovery source"
+    # Extension discovered from the current project.
     PROJECT = "project"
+    # Extension discovered from the user's extension directory.
     USER = "user"
 
 
 class ExtensionsLoadedExtensionStatus(Enum):
     "Current status: running, disabled, failed, or starting"
+    # The extension process is running.
     RUNNING = "running"
+    # The extension is installed but disabled.
     DISABLED = "disabled"
+    # The extension failed to start or crashed.
     FAILED = "failed"
+    # The extension process is starting.
     STARTING = "starting"
 
 
 class HandoffSourceType(Enum):
     "Origin type of the session being handed off"
+    # The handoff originated from a remote session.
     REMOTE = "remote"
+    # The handoff originated from a local session.
     LOCAL = "local"
 
 
 class McpServerSource(Enum):
     "Configuration source: user, workspace, plugin, or builtin"
+    # Server configured in the user's global MCP configuration.
     USER = "user"
+    # Server configured by the current workspace.
     WORKSPACE = "workspace"
+    # Server contributed by an installed plugin.
     PLUGIN = "plugin"
+    # Server bundled with the runtime.
     BUILTIN = "builtin"
 
 
 class McpServerStatus(Enum):
     "Connection status: connected, failed, needs-auth, pending, disabled, or not_configured"
+    # The server is connected and available.
     CONNECTED = "connected"
+    # The server failed to connect or initialize.
     FAILED = "failed"
+    # The server requires authentication before it can connect.
     NEEDS_AUTH = "needs-auth"
+    # The server connection is still being established.
     PENDING = "pending"
+    # The server is configured but disabled.
     DISABLED = "disabled"
+    # The server is not configured for this session.
     NOT_CONFIGURED = "not_configured"
 
 
 class ModelCallFailureSource(Enum):
     "Where the failed model call originated"
+    # Model call from the top-level agent.
     TOP_LEVEL = "top_level"
+    # Model call from a sub-agent.
     SUBAGENT = "subagent"
+    # Model call from MCP sampling.
     MCP_SAMPLING = "mcp_sampling"
 
 
@@ -4938,8 +4980,11 @@ class PermissionPromptRequestKind(Enum):
 
 class PermissionPromptRequestPathAccessKind(Enum):
     "Underlying permission kind that needs path approval"
+    # Read access to a filesystem path.
     READ = "read"
+    # Shell command access involving a filesystem path.
     SHELL = "shell"
+    # Write access to a filesystem path.
     WRITE = "write"
 
 
@@ -4959,13 +5004,17 @@ class PermissionRequestKind(Enum):
 
 class PermissionRequestMemoryAction(Enum):
     "Whether this is a store or vote memory operation"
+    # Store a new memory.
     STORE = "store"
+    # Vote on an existing memory.
     VOTE = "vote"
 
 
 class PermissionRequestMemoryDirection(Enum):
     "Vote direction (vote only)"
+    # Vote that the memory is useful or accurate.
     UPVOTE = "upvote"
+    # Vote that the memory is incorrect or outdated.
     DOWNVOTE = "downvote"
 
 
@@ -4984,51 +5033,73 @@ class PermissionResultKind(Enum):
 
 class PlanChangedOperation(Enum):
     "The type of operation performed on the plan file"
+    # The plan file was created.
     CREATE = "create"
+    # The plan file was updated.
     UPDATE = "update"
+    # The plan file was deleted.
     DELETE = "delete"
 
 
 class ReasoningSummary(Enum):
     "Reasoning summary mode used for model calls, if applicable (e.g. \"none\", \"concise\", \"detailed\")"
+    # Do not request reasoning summaries from the model.
     NONE = "none"
+    # Request a concise summary of the model's reasoning.
     CONCISE = "concise"
+    # Request a detailed summary of the model's reasoning.
     DETAILED = "detailed"
 
 
 class SessionMode(Enum):
     "The session mode the agent is operating in"
+    # The agent is responding interactively to the user.
     INTERACTIVE = "interactive"
+    # The agent is preparing a plan before making changes.
     PLAN = "plan"
+    # The agent is working autonomously toward task completion.
     AUTOPILOT = "autopilot"
 
 
 class ShutdownType(Enum):
     "Whether the session ended normally (\"routine\") or due to a crash/fatal error (\"error\")"
+    # The session ended normally.
     ROUTINE = "routine"
+    # The session ended because of a crash or fatal error.
     ERROR = "error"
 
 
 class SkillSource(Enum):
     "Source location type (e.g., project, personal-copilot, plugin, builtin)"
+    # Skill defined in the current project's skill directories.
     PROJECT = "project"
+    # Skill discovered from a parent directory in the current workspace tree.
     INHERITED = "inherited"
+    # Skill defined in the user's Copilot skill directory.
     PERSONAL_COPILOT = "personal-copilot"
+    # Skill defined in the user's personal agents skill directory.
     PERSONAL_AGENTS = "personal-agents"
+    # Skill provided by an installed plugin.
     PLUGIN = "plugin"
+    # Skill loaded from a configured custom skill directory.
     CUSTOM = "custom"
+    # Skill bundled with the runtime.
     BUILTIN = "builtin"
 
 
 class SystemMessageRole(Enum):
     "Message role: \"system\" for system prompts, \"developer\" for developer-injected instructions"
+    # System prompt message.
     SYSTEM = "system"
+    # Developer instruction message.
     DEVELOPER = "developer"
 
 
 class SystemNotificationAgentCompletedStatus(Enum):
     "Whether the agent completed successfully or failed"
+    # The agent completed successfully.
     COMPLETED = "completed"
+    # The agent failed.
     FAILED = "failed"
 
 
@@ -5044,7 +5115,9 @@ class SystemNotificationType(Enum):
 
 class ToolExecutionCompleteContentResourceLinkIconTheme(Enum):
     "Theme variant this icon is intended for"
+    # Icon intended for light themes.
     LIGHT = "light"
+    # Icon intended for dark themes.
     DARK = "dark"
 
 
@@ -5060,16 +5133,23 @@ class ToolExecutionCompleteContentType(Enum):
 
 class UserMessageAgentMode(Enum):
     "The agent mode that was active when this message was sent"
+    # The agent is responding interactively to the user.
     INTERACTIVE = "interactive"
+    # The agent is preparing a plan before making changes.
     PLAN = "plan"
+    # The agent is working autonomously toward task completion.
     AUTOPILOT = "autopilot"
+    # The agent is in shell-focused UI mode.
     SHELL = "shell"
 
 
 class UserMessageAttachmentGithubReferenceType(Enum):
     "Type of GitHub reference"
+    # GitHub issue reference.
     ISSUE = "issue"
+    # GitHub pull request reference.
     PR = "pr"
+    # GitHub discussion reference.
     DISCUSSION = "discussion"
 
 
@@ -5096,13 +5176,17 @@ class UserToolSessionApprovalKind(Enum):
 
 class WorkingDirectoryContextHostType(Enum):
     "Hosting platform type of the repository (github or ado)"
+    # Repository is hosted on GitHub.
     GITHUB = "github"
+    # Repository is hosted on Azure DevOps.
     ADO = "ado"
 
 
 class WorkspaceFileChangedOperation(Enum):
     "Whether the file was newly created or updated"
+    # The workspace file was created.
     CREATE = "create"
+    # The workspace file was updated.
     UPDATE = "update"
 
 
diff --git a/rust/src/generated/api_types.rs b/rust/src/generated/api_types.rs
index 271afb62c..fa53f1053 100644
--- a/rust/src/generated/api_types.rs
+++ b/rust/src/generated/api_types.rs
@@ -5420,6 +5420,36 @@ pub struct SlashCommandTextResult {
     pub text: String,
 }
 
+/// Schema for the `SlashCommandSelectSubcommandOption` type.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SlashCommandSelectSubcommandOption {
+    /// Human-readable description of the subcommand
+    pub description: String,
+    /// Optional group label for organizing options
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub group: Option<String>,
+    /// Subcommand name to invoke
+    pub name: String,
+}
+
+/// Schema for the `SlashCommandSelectSubcommandResult` type.
+#[derive(Debug, Clone, Default, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SlashCommandSelectSubcommandResult {
+    /// Parent command name that requires subcommand selection
+    pub command: String,
+    /// Select subcommand result discriminator
+    pub kind: SlashCommandSelectSubcommandResultKind,
+    /// Available subcommand options for the client to present
+    pub options: Vec<SlashCommandSelectSubcommandOption>,
+    /// True when the invocation mutated user runtime settings; consumers caching settings should refresh
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub runtime_settings_changed: Option<bool>,
+    /// Human-readable title for the selection UI
+    pub title: String,
+}
+
 /// Schema for the `TaskAgentInfo` type.
 ///
 /// <div class="warning">
@@ -8694,16 +8724,22 @@ pub struct SessionFsSqliteExistsParams {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AgentInfoSource {
+    /// Agent loaded from the user's personal agent configuration.
     #[serde(rename = "user")]
     User,
+    /// Agent loaded from the current project's repository configuration.
     #[serde(rename = "project")]
     Project,
+    /// Agent inherited from a parent project or workspace.
     #[serde(rename = "inherited")]
     Inherited,
+    /// Agent provided by a remote runtime or service.
     #[serde(rename = "remote")]
     Remote,
+    /// Agent contributed by an installed plugin.
     #[serde(rename = "plugin")]
     Plugin,
+    /// Agent built into the Copilot runtime.
     #[serde(rename = "builtin")]
     Builtin,
     /// Unknown variant for forward compatibility.
@@ -8723,18 +8759,25 @@ pub enum ApiKeyAuthInfoType {
 /// Authentication type
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AuthInfoType {
+    /// Authentication provided by a GitHub App HMAC credential.
     #[serde(rename = "hmac")]
     Hmac,
+    /// Authentication resolved from environment-provided credentials.
     #[serde(rename = "env")]
     Env,
+    /// Authentication from an interactive user sign-in.
     #[serde(rename = "user")]
     User,
+    /// Authentication delegated to the GitHub CLI.
     #[serde(rename = "gh-cli")]
     GhCli,
+    /// Authentication from an API key credential.
     #[serde(rename = "api-key")]
     ApiKey,
+    /// Authentication from a GitHub token.
     #[serde(rename = "token")]
     Token,
+    /// Authentication from a Copilot API token.
     #[serde(rename = "copilot-api-token")]
     CopilotApiToken,
     /// Unknown variant for forward compatibility.
@@ -8746,6 +8789,7 @@ pub enum AuthInfoType {
 /// Optional completion hint for the input (e.g. 'directory' for filesystem path completion)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SlashCommandInputCompletion {
+    /// Input should complete filesystem directories.
     #[serde(rename = "directory")]
     Directory,
     /// Unknown variant for forward compatibility.
@@ -8757,10 +8801,13 @@ pub enum SlashCommandInputCompletion {
 /// Coarse command category for grouping and behavior: runtime built-in, skill-backed command, or SDK/client-owned command
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SlashCommandKind {
+    /// Command implemented by the runtime.
     #[serde(rename = "builtin")]
     Builtin,
+    /// Command backed by a skill.
     #[serde(rename = "skill")]
     Skill,
+    /// Command registered by an SDK client or extension.
     #[serde(rename = "client")]
     Client,
     /// Unknown variant for forward compatibility.
@@ -8779,8 +8826,10 @@ pub enum SlashCommandKind {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ConnectedRemoteSessionMetadataKind {
+    /// Remote CLI session.
     #[serde(rename = "remote-session")]
     RemoteSession,
+    /// GitHub Copilot coding agent session.
     #[serde(rename = "coding-agent")]
     CodingAgent,
     /// Unknown variant for forward compatibility.
@@ -8792,10 +8841,13 @@ pub enum ConnectedRemoteSessionMetadataKind {
 /// Controls how MCP tool result content is filtered: none leaves content unchanged, markdown sanitizes HTML while preserving Markdown-friendly output, and hidden_characters removes characters that can hide directives.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ContentFilterMode {
+    /// Leave MCP tool result content unchanged.
     #[serde(rename = "none")]
     None,
+    /// Sanitize HTML while preserving Markdown-friendly output.
     #[serde(rename = "markdown")]
     Markdown,
+    /// Remove characters that can hide directives.
     #[serde(rename = "hidden_characters")]
     HiddenCharacters,
     /// Unknown variant for forward compatibility.
@@ -8823,12 +8875,16 @@ pub enum CopilotApiTokenAuthInfoType {
 /// Server transport type: stdio, http, sse, or memory
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum DiscoveredMcpServerType {
+    /// Server communicates over stdio with a local child process.
     #[serde(rename = "stdio")]
     Stdio,
+    /// Server communicates over streamable HTTP.
     #[serde(rename = "http")]
     Http,
+    /// Server communicates over Server-Sent Events.
     #[serde(rename = "sse")]
     Sse,
+    /// Server is backed by an in-memory runtime implementation.
     #[serde(rename = "memory")]
     Memory,
     /// Unknown variant for forward compatibility.
@@ -8855,8 +8911,10 @@ pub enum EnvAuthInfoType {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum EventsAgentScope {
+    /// Return main-agent events and typed subagent lifecycle events.
     #[serde(rename = "primary")]
     Primary,
+    /// Return events from all agents.
     #[serde(rename = "all")]
     All,
     /// Unknown variant for forward compatibility.
@@ -8875,8 +8933,10 @@ pub enum EventsAgentScope {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum EventsCursorStatus {
+    /// The cursor was applied successfully.
     #[serde(rename = "ok")]
     Ok,
+    /// The cursor referred to history that is no longer available.
     #[serde(rename = "expired")]
     Expired,
     /// Unknown variant for forward compatibility.
@@ -8895,8 +8955,10 @@ pub enum EventsCursorStatus {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExtensionSource {
+    /// Extension discovered from the current project's .github/extensions directory.
     #[serde(rename = "project")]
     Project,
+    /// Extension discovered from the user's ~/.copilot/extensions directory.
     #[serde(rename = "user")]
     User,
     /// Unknown variant for forward compatibility.
@@ -8915,12 +8977,16 @@ pub enum ExtensionSource {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExtensionStatus {
+    /// The extension process is running.
     #[serde(rename = "running")]
     Running,
+    /// The extension is installed but disabled.
     #[serde(rename = "disabled")]
     Disabled,
+    /// The extension failed to start or crashed.
     #[serde(rename = "failed")]
     Failed,
+    /// The extension process is starting.
     #[serde(rename = "starting")]
     Starting,
     /// Unknown variant for forward compatibility.
@@ -8932,8 +8998,10 @@ pub enum ExtensionStatus {
 /// Binary result type discriminator. Use "image" for images and "resource" for other binary data.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExternalToolTextResultForLlmBinaryResultsForLlmType {
+    /// Binary image data.
     #[serde(rename = "image")]
     Image,
+    /// Other binary resource data.
     #[serde(rename = "resource")]
     Resource,
     /// Unknown variant for forward compatibility.
@@ -8969,8 +9037,10 @@ pub enum ExternalToolTextResultForLlmContentResourceType {
 /// Theme variant this icon is intended for
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExternalToolTextResultForLlmContentResourceLinkIconTheme {
+    /// Icon intended for light themes.
     #[serde(rename = "light")]
     Light,
+    /// Icon intended for dark themes.
     #[serde(rename = "dark")]
     Dark,
     /// Unknown variant for forward compatibility.
@@ -9054,12 +9124,16 @@ pub enum InstalledPluginSourceUrlSource {
 /// Where this source lives — used for UI grouping
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum InstructionsSourcesLocation {
+    /// Instructions live in user-level configuration.
     #[serde(rename = "user")]
     User,
+    /// Instructions live in repository-level configuration.
     #[serde(rename = "repository")]
     Repository,
+    /// Instructions live under the current working directory.
     #[serde(rename = "working-directory")]
     WorkingDirectory,
+    /// Instructions live in plugin-provided configuration.
     #[serde(rename = "plugin")]
     Plugin,
     /// Unknown variant for forward compatibility.
@@ -9071,18 +9145,25 @@ pub enum InstructionsSourcesLocation {
 /// Category of instruction source — used for merge logic
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum InstructionsSourcesType {
+    /// Instructions loaded from the user's home configuration.
     #[serde(rename = "home")]
     Home,
+    /// Instructions loaded from repository-scoped files.
     #[serde(rename = "repo")]
     Repo,
+    /// Instructions loaded from model-specific files.
     #[serde(rename = "model")]
     Model,
+    /// Instructions loaded from VS Code instruction files.
     #[serde(rename = "vscode")]
     Vscode,
+    /// Instructions discovered from nested agent files.
     #[serde(rename = "nested-agents")]
     NestedAgents,
+    /// Instructions inherited from child instruction files.
     #[serde(rename = "child-instructions")]
     ChildInstructions,
+    /// Instructions supplied by an installed plugin.
     #[serde(rename = "plugin")]
     Plugin,
     /// Unknown variant for forward compatibility.
@@ -9094,10 +9175,13 @@ pub enum InstructionsSourcesType {
 /// Log severity level. Determines how the message is displayed in the timeline. Defaults to "info".
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionLogLevel {
+    /// Informational message.
     #[serde(rename = "info")]
     Info,
+    /// Warning message that may require attention.
     #[serde(rename = "warning")]
     Warning,
+    /// Error message describing a failure.
     #[serde(rename = "error")]
     Error,
     /// Unknown variant for forward compatibility.
@@ -9116,10 +9200,13 @@ pub enum SessionLogLevel {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum McpSamplingExecutionAction {
+    /// The sampling inference completed and produced a result.
     #[serde(rename = "success")]
     Success,
+    /// The sampling inference failed or was rejected.
     #[serde(rename = "failure")]
     Failure,
+    /// The sampling inference was cancelled before completion.
     #[serde(rename = "cancelled")]
     Cancelled,
     /// Unknown variant for forward compatibility.
@@ -9131,8 +9218,10 @@ pub enum McpSamplingExecutionAction {
 /// OAuth grant type to use when authenticating to the remote MCP server.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum McpServerConfigHttpOauthGrantType {
+    /// Interactive browser-based authorization code flow with PKCE.
     #[serde(rename = "authorization_code")]
     AuthorizationCode,
+    /// Headless client credentials flow using the configured OAuth client.
     #[serde(rename = "client_credentials")]
     ClientCredentials,
     /// Unknown variant for forward compatibility.
@@ -9144,8 +9233,10 @@ pub enum McpServerConfigHttpOauthGrantType {
 /// Remote transport type. Defaults to "http" when omitted.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum McpServerConfigHttpType {
+    /// Streamable HTTP transport.
     #[serde(rename = "http")]
     Http,
+    /// Server-Sent Events transport.
     #[serde(rename = "sse")]
     Sse,
     /// Unknown variant for forward compatibility.
@@ -9164,8 +9255,10 @@ pub enum McpServerConfigHttpType {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum McpSetEnvValueModeDetails {
+    /// Treat MCP server environment values as literal strings.
     #[serde(rename = "direct")]
     Direct,
+    /// Treat MCP server environment values as host-side references to resolve before launch.
     #[serde(rename = "indirect")]
     Indirect,
     /// Unknown variant for forward compatibility.
@@ -9184,8 +9277,10 @@ pub enum McpSetEnvValueModeDetails {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionWorkingDirectoryContextHostType {
+    /// The working directory repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// The working directory repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -9204,10 +9299,13 @@ pub enum SessionWorkingDirectoryContextHostType {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum MetadataSnapshotCurrentMode {
+    /// The agent is responding interactively to the user.
     #[serde(rename = "interactive")]
     Interactive,
+    /// The agent is preparing a plan before making changes.
     #[serde(rename = "plan")]
     Plan,
+    /// The agent is working autonomously toward task completion.
     #[serde(rename = "autopilot")]
     Autopilot,
     /// Unknown variant for forward compatibility.
@@ -9226,8 +9324,10 @@ pub enum MetadataSnapshotCurrentMode {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum MetadataSnapshotRemoteMetadataTaskType {
+    /// Remote task originated from Copilot Coding Agent.
     #[serde(rename = "cca")]
     Cca,
+    /// Remote task originated from a CLI remote-session invocation.
     #[serde(rename = "cli")]
     Cli,
     /// Unknown variant for forward compatibility.
@@ -9239,10 +9339,13 @@ pub enum MetadataSnapshotRemoteMetadataTaskType {
 /// Model capability category for grouping in the model picker
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ModelPickerCategory {
+    /// Lightweight model category optimized for faster, lower-cost interactions.
     #[serde(rename = "lightweight")]
     Lightweight,
+    /// Versatile model category suitable for a broad range of tasks.
     #[serde(rename = "versatile")]
     Versatile,
+    /// Powerful model category optimized for complex tasks.
     #[serde(rename = "powerful")]
     Powerful,
     /// Unknown variant for forward compatibility.
@@ -9254,12 +9357,16 @@ pub enum ModelPickerCategory {
 /// Relative cost tier for token-based billing users
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ModelPickerPriceCategory {
+    /// Lowest relative token cost tier.
     #[serde(rename = "low")]
     Low,
+    /// Medium relative token cost tier.
     #[serde(rename = "medium")]
     Medium,
+    /// High relative token cost tier.
     #[serde(rename = "high")]
     High,
+    /// Highest relative token cost tier.
     #[serde(rename = "very_high")]
     VeryHigh,
     /// Unknown variant for forward compatibility.
@@ -9271,10 +9378,13 @@ pub enum ModelPickerPriceCategory {
 /// Current policy state for this model
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ModelPolicyState {
+    /// The model is enabled by policy.
     #[serde(rename = "enabled")]
     Enabled,
+    /// The model is disabled by policy.
     #[serde(rename = "disabled")]
     Disabled,
+    /// No explicit policy is configured for the model.
     #[serde(rename = "unconfigured")]
     Unconfigured,
     /// Unknown variant for forward compatibility.
@@ -9293,8 +9403,10 @@ pub enum ModelPolicyState {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum OptionsUpdateEnvValueMode {
+    /// Pass MCP server environment values as literal strings.
     #[serde(rename = "direct")]
     Direct,
+    /// Resolve MCP server environment values from host-side references.
     #[serde(rename = "indirect")]
     Indirect,
     /// Unknown variant for forward compatibility.
@@ -9625,8 +9737,10 @@ pub enum PermissionDecision {
 /// Allowed values for the `PermissionsConfigureAdditionalContentExclusionPolicyScope` enumeration.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PermissionsConfigureAdditionalContentExclusionPolicyScope {
+    /// The content exclusion policy applies to the current repository.
     #[serde(rename = "repo")]
     Repo,
+    /// The content exclusion policy applies across all repositories.
     #[serde(rename = "all")]
     All,
     /// Unknown variant for forward compatibility.
@@ -9638,8 +9752,10 @@ pub enum PermissionsConfigureAdditionalContentExclusionPolicyScope {
 /// Whether the change applies to ephemeral session-scoped rules (cleared at session end) or to location-scoped rules persisted via the location-permissions config file.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PermissionsModifyRulesScope {
+    /// Apply the rule change only to this session.
     #[serde(rename = "session")]
     Session,
+    /// Persist the rule change for this project location.
     #[serde(rename = "location")]
     Location,
     /// Unknown variant for forward compatibility.
@@ -9651,12 +9767,16 @@ pub enum PermissionsModifyRulesScope {
 /// Optional source for allow-all telemetry. Defaults to `rpc` when omitted for SDK callers.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PermissionsSetApproveAllSource {
+    /// Allow-all was enabled from a CLI command-line flag.
     #[serde(rename = "cli_flag")]
     CliFlag,
+    /// Allow-all was enabled by a slash command.
     #[serde(rename = "slash_command")]
     SlashCommand,
+    /// Allow-all was enabled by confirming autopilot behavior.
     #[serde(rename = "autopilot_confirmation")]
     AutopilotConfirmation,
+    /// Allow-all was enabled through an RPC caller.
     #[serde(rename = "rpc")]
     Rpc,
     /// Unknown variant for forward compatibility.
@@ -9675,8 +9795,10 @@ pub enum PermissionsSetApproveAllSource {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum QueuePendingItemsKind {
+    /// A queued user message.
     #[serde(rename = "message")]
     Message,
+    /// A queued slash command or model-change command.
     #[serde(rename = "command")]
     Command,
     /// Unknown variant for forward compatibility.
@@ -9695,10 +9817,13 @@ pub enum QueuePendingItemsKind {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum RemoteSessionMode {
+    /// Disable remote session export and steering.
     #[serde(rename = "off")]
     Off,
+    /// Export session events to GitHub without enabling remote steering.
     #[serde(rename = "export")]
     Export,
+    /// Enable both remote session export and remote steering.
     #[serde(rename = "on")]
     On,
     /// Unknown variant for forward compatibility.
@@ -9710,12 +9835,16 @@ pub enum RemoteSessionMode {
 /// The UI mode the agent was in when this message was sent. Defaults to the session's current mode.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SendAgentMode {
+    /// The agent is responding interactively to the user.
     #[serde(rename = "interactive")]
     Interactive,
+    /// The agent is preparing a plan before making changes.
     #[serde(rename = "plan")]
     Plan,
+    /// The agent is working autonomously toward task completion.
     #[serde(rename = "autopilot")]
     Autopilot,
+    /// The agent is in shell-focused UI mode.
     #[serde(rename = "shell")]
     Shell,
     /// Unknown variant for forward compatibility.
@@ -9751,10 +9880,13 @@ pub enum SendAttachmentFileType {
 /// Type of GitHub reference
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SendAttachmentGithubReferenceType {
+    /// GitHub issue reference.
     #[serde(rename = "issue")]
     Issue,
+    /// GitHub pull request reference.
     #[serde(rename = "pr")]
     Pr,
+    /// GitHub discussion reference.
     #[serde(rename = "discussion")]
     Discussion,
     /// Unknown variant for forward compatibility.
@@ -9774,8 +9906,10 @@ pub enum SendAttachmentSelectionType {
 /// How to deliver the message. `enqueue` (default) appends to the message queue. `immediate` interjects during an in-progress turn.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SendMode {
+    /// Append the message to the normal session queue.
     #[serde(rename = "enqueue")]
     Enqueue,
+    /// Interject the message during the in-progress turn.
     #[serde(rename = "immediate")]
     Immediate,
     /// Unknown variant for forward compatibility.
@@ -9794,8 +9928,10 @@ pub enum SendMode {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionContextHostType {
+    /// Session repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Session repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -9807,7 +9943,9 @@ pub enum SessionContextHostType {
 /// Error classification
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionFsErrorCode {
+    /// The requested path does not exist.
     ENOENT,
+    /// The filesystem operation failed for an unspecified reason.
     UNKNOWN,
     /// Unknown variant for forward compatibility.
     #[default]
@@ -9818,8 +9956,10 @@ pub enum SessionFsErrorCode {
 /// Entry type
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionFsReaddirWithTypesEntryType {
+    /// The entry is a file.
     #[serde(rename = "file")]
     File,
+    /// The entry is a directory.
     #[serde(rename = "directory")]
     Directory,
     /// Unknown variant for forward compatibility.
@@ -9831,8 +9971,10 @@ pub enum SessionFsReaddirWithTypesEntryType {
 /// Path conventions used by this filesystem
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionFsSetProviderConventions {
+    /// Paths use Windows path conventions.
     #[serde(rename = "windows")]
     Windows,
+    /// Paths use POSIX path conventions.
     #[serde(rename = "posix")]
     Posix,
     /// Unknown variant for forward compatibility.
@@ -9844,10 +9986,13 @@ pub enum SessionFsSetProviderConventions {
 /// How to execute the query: 'exec' for DDL/multi-statement (no results), 'query' for SELECT (returns rows), 'run' for INSERT/UPDATE/DELETE (returns rowsAffected)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionFsSqliteQueryType {
+    /// Execute DDL or multi-statement SQL without returning rows.
     #[serde(rename = "exec")]
     Exec,
+    /// Execute a SELECT-style query and return rows.
     #[serde(rename = "query")]
     Query,
+    /// Execute INSERT, UPDATE, or DELETE SQL and return affected-row metadata.
     #[serde(rename = "run")]
     Run,
     /// Unknown variant for forward compatibility.
@@ -9883,8 +10028,10 @@ pub enum SessionInstalledPluginSourceUrlSource {
 /// Repository host type, if known
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionMetadataSnapshotWorkspaceHostType {
+    /// Workspace summary repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Workspace summary repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -9896,8 +10043,11 @@ pub enum SessionMetadataSnapshotWorkspaceHostType {
 /// Signal to send (default: SIGTERM)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ShellKillSignal {
+    /// Request graceful process termination.
     SIGTERM,
+    /// Forcefully terminate the process.
     SIGKILL,
+    /// Send an interrupt signal to the process.
     SIGINT,
     /// Unknown variant for forward compatibility.
     #[default]
@@ -9929,6 +10079,14 @@ pub enum SlashCommandTextResultKind {
     Text,
 }
 
+/// Select subcommand result discriminator
+#[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
+pub enum SlashCommandSelectSubcommandResultKind {
+    #[serde(rename = "select-subcommand")]
+    #[default]
+    SelectSubcommand,
+}
+
 /// Result of invoking the slash command (text output, prompt to send to the agent, or completion).
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(untagged)]
@@ -9936,6 +10094,7 @@ pub enum SlashCommandInvocationResult {
     Text(SlashCommandTextResult),
     AgentPrompt(SlashCommandAgentPromptResult),
     Completed(SlashCommandCompletedResult),
+    SelectSubcommand(SlashCommandSelectSubcommandResult),
 }
 
 /// Whether task execution is synchronously awaited or managed in the background
@@ -9948,8 +10107,10 @@ pub enum SlashCommandInvocationResult {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum TaskExecutionMode {
+    /// The task was started with synchronous waiting.
     #[serde(rename = "sync")]
     Sync,
+    /// The task is managed in the background.
     #[serde(rename = "background")]
     Background,
     /// Unknown variant for forward compatibility.
@@ -9968,14 +10129,19 @@ pub enum TaskExecutionMode {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum TaskStatus {
+    /// The task is actively executing.
     #[serde(rename = "running")]
     Running,
+    /// The task is waiting for additional input.
     #[serde(rename = "idle")]
     Idle,
+    /// The task finished successfully.
     #[serde(rename = "completed")]
     Completed,
+    /// The task finished with an error.
     #[serde(rename = "failed")]
     Failed,
+    /// The task was cancelled before completion.
     #[serde(rename = "cancelled")]
     Cancelled,
     /// Unknown variant for forward compatibility.
@@ -10002,8 +10168,10 @@ pub enum TaskAgentInfoType {
 /// </div>
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum TaskShellInfoAttachmentMode {
+    /// The shell runs in a managed PTY session.
     #[serde(rename = "attached")]
     Attached,
+    /// The shell runs as an independent background process.
     #[serde(rename = "detached")]
     Detached,
     /// Unknown variant for forward compatibility.
@@ -10031,10 +10199,13 @@ pub enum TokenAuthInfoType {
 /// User's choice for auto-mode switching: yes (allow this turn), yes_always (allow + persist as setting), or no (decline).
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum UIAutoModeSwitchResponse {
+    /// Allow the automatic mode switch for this turn.
     #[serde(rename = "yes")]
     Yes,
+    /// Allow this mode switch and persist the preference.
     #[serde(rename = "yes_always")]
     YesAlways,
+    /// Decline the automatic mode switch.
     #[serde(rename = "no")]
     No,
     /// Unknown variant for forward compatibility.
@@ -10078,10 +10249,13 @@ pub enum UIElicitationSchemaType {
 /// The user's response: accept (submitted), decline (rejected), or cancel (dismissed)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum UIElicitationResponseAction {
+    /// The user submitted the requested form values.
     #[serde(rename = "accept")]
     Accept,
+    /// The user explicitly declined to provide the requested input.
     #[serde(rename = "decline")]
     Decline,
+    /// The user dismissed the elicitation request.
     #[serde(rename = "cancel")]
     Cancel,
     /// Unknown variant for forward compatibility.
@@ -10101,8 +10275,10 @@ pub enum UIElicitationSchemaPropertyBooleanType {
 /// Numeric type accepted by the field.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum UIElicitationSchemaPropertyNumberType {
+    /// Any JSON number.
     #[serde(rename = "number")]
     Number,
+    /// Integer JSON number.
     #[serde(rename = "integer")]
     Integer,
     /// Unknown variant for forward compatibility.
@@ -10114,12 +10290,16 @@ pub enum UIElicitationSchemaPropertyNumberType {
 /// Optional format hint that constrains the accepted input.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum UIElicitationSchemaPropertyStringFormat {
+    /// Email address string format.
     #[serde(rename = "email")]
     Email,
+    /// URI string format.
     #[serde(rename = "uri")]
     Uri,
+    /// Calendar date string format.
     #[serde(rename = "date")]
     Date,
+    /// Date-time string format.
     #[serde(rename = "date-time")]
     DateTime,
     /// Unknown variant for forward compatibility.
@@ -10155,12 +10335,16 @@ pub enum UIElicitationStringOneOfFieldType {
 /// The action the user selected. Defaults to 'autopilot' when autoApproveEdits is true, otherwise 'interactive'.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum UIExitPlanModeAction {
+    /// Exit plan mode without starting implementation.
     #[serde(rename = "exit_only")]
     ExitOnly,
+    /// Exit plan mode and continue interactively.
     #[serde(rename = "interactive")]
     Interactive,
+    /// Exit plan mode and continue in autopilot mode.
     #[serde(rename = "autopilot")]
     Autopilot,
+    /// Exit plan mode and continue in autopilot mode with parallel subagent execution.
     #[serde(rename = "autopilot_fleet")]
     AutopilotFleet,
     /// Unknown variant for forward compatibility.
@@ -10179,8 +10363,10 @@ pub enum UserAuthInfoType {
 
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum WorkspacesGetWorkspaceResultWorkspaceHostType {
+    /// Workspace repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Workspace repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -10192,8 +10378,10 @@ pub enum WorkspacesGetWorkspaceResultWorkspaceHostType {
 /// Repository host type, if known
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum WorkspaceSummaryHostType {
+    /// Workspace summary repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Workspace summary repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -10204,8 +10392,10 @@ pub enum WorkspaceSummaryHostType {
 
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionWorkspacesGetWorkspaceResultWorkspaceHostType {
+    /// Workspace repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Workspace repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -10217,8 +10407,10 @@ pub enum SessionWorkspacesGetWorkspaceResultWorkspaceHostType {
 /// Repository host type, if known
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionMetadataSnapshotResultWorkspaceHostType {
+    /// Workspace summary repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Workspace summary repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
diff --git a/rust/src/generated/session_events.rs b/rust/src/generated/session_events.rs
index 6d9237b92..053c4f8f8 100644
--- a/rust/src/generated/session_events.rs
+++ b/rust/src/generated/session_events.rs
@@ -1305,7 +1305,7 @@ pub struct AssistantUsageData {
     pub reasoning_tokens: Option<i64>,
     /// Time to first token in milliseconds. Only available for streaming requests
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub ttft_ms: Option<i64>,
+    pub time_to_first_token_ms: Option<i64>,
 }
 
 /// Session event "model.call_failure". Failed LLM API call metadata for telemetry
@@ -2874,8 +2874,10 @@ pub struct SessionExtensionsLoadedData {
 /// Hosting platform type of the repository (github or ado)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum WorkingDirectoryContextHostType {
+    /// Repository is hosted on GitHub.
     #[serde(rename = "github")]
     Github,
+    /// Repository is hosted on Azure DevOps.
     #[serde(rename = "ado")]
     Ado,
     /// Unknown variant for forward compatibility.
@@ -2887,10 +2889,13 @@ pub enum WorkingDirectoryContextHostType {
 /// Reasoning summary mode used for model calls, if applicable (e.g. "none", "concise", "detailed")
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ReasoningSummary {
+    /// Do not request reasoning summaries from the model.
     #[serde(rename = "none")]
     None,
+    /// Request a concise summary of the model's reasoning.
     #[serde(rename = "concise")]
     Concise,
+    /// Request a detailed summary of the model's reasoning.
     #[serde(rename = "detailed")]
     Detailed,
     /// Unknown variant for forward compatibility.
@@ -2902,10 +2907,13 @@ pub enum ReasoningSummary {
 /// The session mode the agent is operating in
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SessionMode {
+    /// The agent is responding interactively to the user.
     #[serde(rename = "interactive")]
     Interactive,
+    /// The agent is preparing a plan before making changes.
     #[serde(rename = "plan")]
     Plan,
+    /// The agent is working autonomously toward task completion.
     #[serde(rename = "autopilot")]
     Autopilot,
     /// Unknown variant for forward compatibility.
@@ -2917,10 +2925,13 @@ pub enum SessionMode {
 /// The type of operation performed on the plan file
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PlanChangedOperation {
+    /// The plan file was created.
     #[serde(rename = "create")]
     Create,
+    /// The plan file was updated.
     #[serde(rename = "update")]
     Update,
+    /// The plan file was deleted.
     #[serde(rename = "delete")]
     Delete,
     /// Unknown variant for forward compatibility.
@@ -2932,8 +2943,10 @@ pub enum PlanChangedOperation {
 /// Whether the file was newly created or updated
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum WorkspaceFileChangedOperation {
+    /// The workspace file was created.
     #[serde(rename = "create")]
     Create,
+    /// The workspace file was updated.
     #[serde(rename = "update")]
     Update,
     /// Unknown variant for forward compatibility.
@@ -2945,8 +2958,10 @@ pub enum WorkspaceFileChangedOperation {
 /// Origin type of the session being handed off
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum HandoffSourceType {
+    /// The handoff originated from a remote session.
     #[serde(rename = "remote")]
     Remote,
+    /// The handoff originated from a local session.
     #[serde(rename = "local")]
     Local,
     /// Unknown variant for forward compatibility.
@@ -2958,8 +2973,10 @@ pub enum HandoffSourceType {
 /// Whether the session ended normally ("routine") or due to a crash/fatal error ("error")
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ShutdownType {
+    /// The session ended normally.
     #[serde(rename = "routine")]
     Routine,
+    /// The session ended because of a crash or fatal error.
     #[serde(rename = "error")]
     Error,
     /// Unknown variant for forward compatibility.
@@ -2971,12 +2988,16 @@ pub enum ShutdownType {
 /// The agent mode that was active when this message was sent
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum UserMessageAgentMode {
+    /// The agent is responding interactively to the user.
     #[serde(rename = "interactive")]
     Interactive,
+    /// The agent is preparing a plan before making changes.
     #[serde(rename = "plan")]
     Plan,
+    /// The agent is working autonomously toward task completion.
     #[serde(rename = "autopilot")]
     Autopilot,
+    /// The agent is in shell-focused UI mode.
     #[serde(rename = "shell")]
     Shell,
     /// Unknown variant for forward compatibility.
@@ -2988,8 +3009,10 @@ pub enum UserMessageAgentMode {
 /// Tool call type: "function" for standard tool calls, "custom" for grammar-based tool calls. Defaults to "function" when absent.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AssistantMessageToolRequestType {
+    /// Standard function-style tool call.
     #[serde(rename = "function")]
     Function,
+    /// Custom grammar-based tool call.
     #[serde(rename = "custom")]
     Custom,
     /// Unknown variant for forward compatibility.
@@ -3001,12 +3024,16 @@ pub enum AssistantMessageToolRequestType {
 /// API endpoint used for this model call, matching CAPI supported_endpoints vocabulary
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AssistantUsageApiEndpoint {
+    /// Chat Completions API endpoint.
     #[serde(rename = "/chat/completions")]
     ChatCompletions,
+    /// Anthropic Messages API endpoint.
     #[serde(rename = "/v1/messages")]
     V1Messages,
+    /// Responses API endpoint.
     #[serde(rename = "/responses")]
     Responses,
+    /// WebSocket Responses API endpoint.
     #[serde(rename = "ws:/responses")]
     WsResponses,
     /// Unknown variant for forward compatibility.
@@ -3018,10 +3045,13 @@ pub enum AssistantUsageApiEndpoint {
 /// Where the failed model call originated
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ModelCallFailureSource {
+    /// Model call from the top-level agent.
     #[serde(rename = "top_level")]
     TopLevel,
+    /// Model call from a sub-agent.
     #[serde(rename = "subagent")]
     Subagent,
+    /// Model call from MCP sampling.
     #[serde(rename = "mcp_sampling")]
     McpSampling,
     /// Unknown variant for forward compatibility.
@@ -3033,10 +3063,13 @@ pub enum ModelCallFailureSource {
 /// Finite reason code describing why the current turn was aborted
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AbortReason {
+    /// The local user requested the abort, for example by pressing Ctrl+C in the CLI.
     #[serde(rename = "user_initiated")]
     UserInitiated,
+    /// A remote command requested the abort.
     #[serde(rename = "remote_command")]
     RemoteCommand,
+    /// An MCP server delivered a user.abort notification.
     #[serde(rename = "user_abort")]
     UserAbort,
     /// Unknown variant for forward compatibility.
@@ -3080,8 +3113,10 @@ pub enum ToolExecutionCompleteContentAudioType {
 /// Theme variant this icon is intended for
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ToolExecutionCompleteContentResourceLinkIconTheme {
+    /// Icon intended for light themes.
     #[serde(rename = "light")]
     Light,
+    /// Icon intended for dark themes.
     #[serde(rename = "dark")]
     Dark,
     /// Unknown variant for forward compatibility.
@@ -3129,8 +3164,10 @@ pub enum ToolExecutionCompleteContent {
 /// Message role: "system" for system prompts, "developer" for developer-injected instructions
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SystemMessageRole {
+    /// System prompt message.
     #[serde(rename = "system")]
     System,
+    /// Developer instruction message.
     #[serde(rename = "developer")]
     Developer,
     /// Unknown variant for forward compatibility.
@@ -3182,8 +3219,10 @@ pub enum PermissionRequestUrlKind {
 /// Whether this is a store or vote memory operation
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PermissionRequestMemoryAction {
+    /// Store a new memory.
     #[serde(rename = "store")]
     Store,
+    /// Vote on an existing memory.
     #[serde(rename = "vote")]
     Vote,
     /// Unknown variant for forward compatibility.
@@ -3195,8 +3234,10 @@ pub enum PermissionRequestMemoryAction {
 /// Vote direction (vote only)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PermissionRequestMemoryDirection {
+    /// Vote that the memory is useful or accurate.
     #[serde(rename = "upvote")]
     Upvote,
+    /// Vote that the memory is incorrect or outdated.
     #[serde(rename = "downvote")]
     Downvote,
     /// Unknown variant for forward compatibility.
@@ -3320,10 +3361,13 @@ pub enum PermissionPromptRequestCustomToolKind {
 /// Underlying permission kind that needs path approval
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum PermissionPromptRequestPathAccessKind {
+    /// Read access to a filesystem path.
     #[serde(rename = "read")]
     Read,
+    /// Shell command access involving a filesystem path.
     #[serde(rename = "shell")]
     Shell,
+    /// Write access to a filesystem path.
     #[serde(rename = "write")]
     Write,
     /// Unknown variant for forward compatibility.
@@ -3551,8 +3595,10 @@ pub enum PermissionResult {
 /// Elicitation mode; "form" for structured input, "url" for browser-based. Defaults to "form" when absent.
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ElicitationRequestedMode {
+    /// Structured form-based elicitation.
     #[serde(rename = "form")]
     Form,
+    /// Browser URL-based elicitation.
     #[serde(rename = "url")]
     Url,
     /// Unknown variant for forward compatibility.
@@ -3572,10 +3618,13 @@ pub enum ElicitationRequestedSchemaType {
 /// The user action: "accept" (submitted form), "decline" (explicitly refused), or "cancel" (dismissed)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ElicitationCompletedAction {
+    /// The user submitted the requested form.
     #[serde(rename = "accept")]
     Accept,
+    /// The user explicitly declined the request.
     #[serde(rename = "decline")]
     Decline,
+    /// The user dismissed the request.
     #[serde(rename = "cancel")]
     Cancel,
     /// Unknown variant for forward compatibility.
@@ -3595,10 +3644,13 @@ pub enum McpOauthRequiredStaticClientConfigGrantType {
 /// The user's auto-mode-switch choice
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum AutoModeSwitchResponse {
+    /// Switch models for this request.
     #[serde(rename = "yes")]
     Yes,
+    /// Switch models now and keep using the replacement automatically.
     #[serde(rename = "yes_always")]
     YesAlways,
+    /// Do not switch models.
     #[serde(rename = "no")]
     No,
     /// Unknown variant for forward compatibility.
@@ -3610,12 +3662,16 @@ pub enum AutoModeSwitchResponse {
 /// Exit plan mode action
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExitPlanModeAction {
+    /// Exit plan mode without starting implementation.
     #[serde(rename = "exit_only")]
     ExitOnly,
+    /// Exit plan mode and continue in interactive mode.
     #[serde(rename = "interactive")]
     Interactive,
+    /// Exit plan mode and continue autonomously.
     #[serde(rename = "autopilot")]
     Autopilot,
+    /// Exit plan mode and continue with parallel autonomous workers.
     #[serde(rename = "autopilot_fleet")]
     AutopilotFleet,
     /// Unknown variant for forward compatibility.
@@ -3627,18 +3683,25 @@ pub enum ExitPlanModeAction {
 /// Source location type (e.g., project, personal-copilot, plugin, builtin)
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum SkillSource {
+    /// Skill defined in the current project's skill directories.
     #[serde(rename = "project")]
     Project,
+    /// Skill discovered from a parent directory in the current workspace tree.
     #[serde(rename = "inherited")]
     Inherited,
+    /// Skill defined in the user's Copilot skill directory.
     #[serde(rename = "personal-copilot")]
     PersonalCopilot,
+    /// Skill defined in the user's personal agents skill directory.
     #[serde(rename = "personal-agents")]
     PersonalAgents,
+    /// Skill provided by an installed plugin.
     #[serde(rename = "plugin")]
     Plugin,
+    /// Skill loaded from a configured custom skill directory.
     #[serde(rename = "custom")]
     Custom,
+    /// Skill bundled with the runtime.
     #[serde(rename = "builtin")]
     Builtin,
     /// Unknown variant for forward compatibility.
@@ -3650,12 +3713,16 @@ pub enum SkillSource {
 /// Configuration source: user, workspace, plugin, or builtin
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum McpServerSource {
+    /// Server configured in the user's global MCP configuration.
     #[serde(rename = "user")]
     User,
+    /// Server configured by the current workspace.
     #[serde(rename = "workspace")]
     Workspace,
+    /// Server contributed by an installed plugin.
     #[serde(rename = "plugin")]
     Plugin,
+    /// Server bundled with the runtime.
     #[serde(rename = "builtin")]
     Builtin,
     /// Unknown variant for forward compatibility.
@@ -3667,16 +3734,22 @@ pub enum McpServerSource {
 /// Connection status: connected, failed, needs-auth, pending, disabled, or not_configured
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum McpServerStatus {
+    /// The server is connected and available.
     #[serde(rename = "connected")]
     Connected,
+    /// The server failed to connect or initialize.
     #[serde(rename = "failed")]
     Failed,
+    /// The server requires authentication before it can connect.
     #[serde(rename = "needs-auth")]
     NeedsAuth,
+    /// The server connection is still being established.
     #[serde(rename = "pending")]
     Pending,
+    /// The server is configured but disabled.
     #[serde(rename = "disabled")]
     Disabled,
+    /// The server is not configured for this session.
     #[serde(rename = "not_configured")]
     NotConfigured,
     /// Unknown variant for forward compatibility.
@@ -3688,8 +3761,10 @@ pub enum McpServerStatus {
 /// Discovery source
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExtensionsLoadedExtensionSource {
+    /// Extension discovered from the current project.
     #[serde(rename = "project")]
     Project,
+    /// Extension discovered from the user's extension directory.
     #[serde(rename = "user")]
     User,
     /// Unknown variant for forward compatibility.
@@ -3701,12 +3776,16 @@ pub enum ExtensionsLoadedExtensionSource {
 /// Current status: running, disabled, failed, or starting
 #[derive(Debug, Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
 pub enum ExtensionsLoadedExtensionStatus {
+    /// The extension process is running.
     #[serde(rename = "running")]
     Running,
+    /// The extension is installed but disabled.
     #[serde(rename = "disabled")]
     Disabled,
+    /// The extension failed to start or crashed.
     #[serde(rename = "failed")]
     Failed,
+    /// The extension process is starting.
     #[serde(rename = "starting")]
     Starting,
     /// Unknown variant for forward compatibility.
diff --git a/test/harness/package-lock.json b/test/harness/package-lock.json
index 2d78be42f..21cd224f6 100644
--- a/test/harness/package-lock.json
+++ b/test/harness/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "ISC",
       "devDependencies": {
-        "@github/copilot": "^1.0.51-2",
+        "@github/copilot": "^1.0.51-3",
         "@modelcontextprotocol/sdk": "^1.26.0",
         "@types/node": "^25.3.3",
         "@types/node-forge": "^1.3.14",
@@ -464,9 +464,9 @@
       }
     },
     "node_modules/@github/copilot": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot/-/copilot-1.0.51-2.tgz",
-      "integrity": "sha512-z9DFxVYIvY4MPEidWJxHdJoQNeDRt86egFyVek3zIVOCH5V6+NTF8ZuJAdMJJqbt+5EWxOgT4wBY4JvUfN7fCg==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot/-/copilot-1.0.51-3.tgz",
+      "integrity": "sha512-wbulKqSHhqVXoA8ffqukq3AxMGw8VfVbZ5ysGW+WSHbWXydh9aEKo9/4PqxUxWB4W9oSPggoqrVhj0NgJJ4agw==",
       "dev": true,
       "license": "SEE LICENSE IN LICENSE.md",
       "dependencies": {
@@ -476,20 +476,20 @@
         "copilot": "npm-loader.js"
       },
       "optionalDependencies": {
-        "@github/copilot-darwin-arm64": "1.0.51-2",
-        "@github/copilot-darwin-x64": "1.0.51-2",
-        "@github/copilot-linux-arm64": "1.0.51-2",
-        "@github/copilot-linux-x64": "1.0.51-2",
-        "@github/copilot-linuxmusl-arm64": "1.0.51-2",
-        "@github/copilot-linuxmusl-x64": "1.0.51-2",
-        "@github/copilot-win32-arm64": "1.0.51-2",
-        "@github/copilot-win32-x64": "1.0.51-2"
+        "@github/copilot-darwin-arm64": "1.0.51-3",
+        "@github/copilot-darwin-x64": "1.0.51-3",
+        "@github/copilot-linux-arm64": "1.0.51-3",
+        "@github/copilot-linux-x64": "1.0.51-3",
+        "@github/copilot-linuxmusl-arm64": "1.0.51-3",
+        "@github/copilot-linuxmusl-x64": "1.0.51-3",
+        "@github/copilot-win32-arm64": "1.0.51-3",
+        "@github/copilot-win32-x64": "1.0.51-3"
       }
     },
     "node_modules/@github/copilot-darwin-arm64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-darwin-arm64/-/copilot-darwin-arm64-1.0.51-2.tgz",
-      "integrity": "sha512-iOIAIBbOKuOnUGhsVvmFdrdKu5olSZ1Ve5RkwWj9E/62g4dAuGrEkhisA6xcNt63qDfGfsPQcDKkR+Nhxrgp4g==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-darwin-arm64/-/copilot-darwin-arm64-1.0.51-3.tgz",
+      "integrity": "sha512-PXnMWuaUIbxkBzeDr4cKQy7qtFqldufzWvihI5QhJaF7/l0L/8XoTGtj73qbX7IpG4wpzQ1N8MIZFm/SmyKoqQ==",
       "cpu": [
         "arm64"
       ],
@@ -504,9 +504,9 @@
       }
     },
     "node_modules/@github/copilot-darwin-x64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-darwin-x64/-/copilot-darwin-x64-1.0.51-2.tgz",
-      "integrity": "sha512-7AYiP1D8mZg0UOSx0hiMGS6ZOTKA4miiHpiS5Bvd5AgTchWFNBgM/aHs1D/VSk0dLucGGzSClwzL5u80hNiw/Q==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-darwin-x64/-/copilot-darwin-x64-1.0.51-3.tgz",
+      "integrity": "sha512-sIRQBZjYh7gGDd2wUjgmX5PTfFZfvzrQp8lNvoRsqKnihzPnGaRg+St3lh7St3qtHoOBAaAoYw/DHREEp/p9xg==",
       "cpu": [
         "x64"
       ],
@@ -521,9 +521,9 @@
       }
     },
     "node_modules/@github/copilot-linux-arm64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-linux-arm64/-/copilot-linux-arm64-1.0.51-2.tgz",
-      "integrity": "sha512-X5QVYcaU1IDeawCDxC8NHf8s/8Tq9NX+2a/tKXDFBFLIisoXZCpU0Ap9KRSGyKe8heJbvuDoW4JaJRZj4faAqw==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-linux-arm64/-/copilot-linux-arm64-1.0.51-3.tgz",
+      "integrity": "sha512-LzFRV9EqSFdEiqu+VyoDY4XcO3tvd7VmVzkF02BP9MgwApCCLRzJS4ElMh/3FojqV+hL18vpFSyqPVmsgjLcug==",
       "cpu": [
         "arm64"
       ],
@@ -538,9 +538,9 @@
       }
     },
     "node_modules/@github/copilot-linux-x64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-linux-x64/-/copilot-linux-x64-1.0.51-2.tgz",
-      "integrity": "sha512-wn4W2K+kV3f5XZ8iG7ZplLuxkv9m3oFNcgdfFF5LSlU39k9l/WFahCKWWP6ec4DG9cvfR/Z0Sj4rmQPJoF/nkg==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-linux-x64/-/copilot-linux-x64-1.0.51-3.tgz",
+      "integrity": "sha512-bMEE8/nj9GWx3f/PWvoSGnk6IUHoeVtdDNJk7xUTMMK2eQBUQGKfCtOKTa/mSVpJB81bxiK8IVqZypJO2cYxqQ==",
       "cpu": [
         "x64"
       ],
@@ -555,9 +555,9 @@
       }
     },
     "node_modules/@github/copilot-linuxmusl-arm64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-arm64/-/copilot-linuxmusl-arm64-1.0.51-2.tgz",
-      "integrity": "sha512-cQ4cJ42pN4b3Up5fDpRvVP+yPYifgQD2vplvUavY6bffCCYwLqzK4oHFsABC8uvtqkIq/GbFOZ6XF2W+YdVFUQ==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-arm64/-/copilot-linuxmusl-arm64-1.0.51-3.tgz",
+      "integrity": "sha512-ZEr7RmNv8/FyWdbC6xBPdb7HZO0QdlTGt1SOO+AHW1PuHYdYBdGObDB41SfHf+h0kiiljBsLq8ps1njP/1kIDw==",
       "cpu": [
         "arm64"
       ],
@@ -572,9 +572,9 @@
       }
     },
     "node_modules/@github/copilot-linuxmusl-x64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-x64/-/copilot-linuxmusl-x64-1.0.51-2.tgz",
-      "integrity": "sha512-3wm34yzDeCW2U0im6qDK51iF6dJHhrPqv3VxPwfvTK+7u5iWB9oaGvFRCYtQfA5sV0hJqmD6Gup6MJwB4JgEEQ==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-linuxmusl-x64/-/copilot-linuxmusl-x64-1.0.51-3.tgz",
+      "integrity": "sha512-d4BH9FkXTTSuXfVElNAHe4djktueVQUTj9cOdmKeQKC80Magew1F+7RvCgIDFupmhYnra+1NJf5nM7+wpiaECg==",
       "cpu": [
         "x64"
       ],
@@ -589,9 +589,9 @@
       }
     },
     "node_modules/@github/copilot-win32-arm64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-win32-arm64/-/copilot-win32-arm64-1.0.51-2.tgz",
-      "integrity": "sha512-uAj1YwA8n/qbI1JG8UjHGtuBrJL18FSRkXwB0SdM0aKUozhZs3vdxRROuT5MAbt72KWk+rLldnkVy6HL/tm8sA==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-win32-arm64/-/copilot-win32-arm64-1.0.51-3.tgz",
+      "integrity": "sha512-o/tQTD4VFKhEfoxHD5HMdoaqys5jFt8+pXkQKXSFlkGWzAQZt4iZasIC7L5f/AuGctoZ/kZFW2iMOWNpDHtj5w==",
       "cpu": [
         "arm64"
       ],
@@ -606,9 +606,9 @@
       }
     },
     "node_modules/@github/copilot-win32-x64": {
-      "version": "1.0.51-2",
-      "resolved": "https://registry.npmjs.org/@github/copilot-win32-x64/-/copilot-win32-x64-1.0.51-2.tgz",
-      "integrity": "sha512-Wur8d0y6VsXGbsMhED3uoZylRoJyWLQPHzgf3TD2AEc48zVpuTb4jUKzH9wD1frheAxGTl/kWvLr+6rYRcPK7w==",
+      "version": "1.0.51-3",
+      "resolved": "https://registry.npmjs.org/@github/copilot-win32-x64/-/copilot-win32-x64-1.0.51-3.tgz",
+      "integrity": "sha512-CjpogQNnl0YrEfTCPSUtKPpieVEfWWP2map4OQNLSJXwQ3toG1h359m4QXXLuSz/vJM8aCrCm1VxgCg5KR1eKw==",
       "cpu": [
         "x64"
       ],
diff --git a/test/harness/package.json b/test/harness/package.json
index 7c37f83d6..c1df0271f 100644
--- a/test/harness/package.json
+++ b/test/harness/package.json
@@ -11,7 +11,7 @@
     "test": "vitest run"
   },
   "devDependencies": {
-    "@github/copilot": "^1.0.51-2",
+    "@github/copilot": "^1.0.51-3",
     "@modelcontextprotocol/sdk": "^1.26.0",
     "@types/node": "^25.3.3",
     "@types/node-forge": "^1.3.14",

From ee0ebe825299d78b6a4e96175d1375dbe4b76177 Mon Sep 17 00:00:00 2001
From: Copilot <223556219+Copilot@users.noreply.github.com>
Date: Wed, 20 May 2026 21:13:30 -0400
Subject: [PATCH 2/2] Fix flaky CI tests: add TCP connection timeout and fix
 MCP test hang

- nodejs/src/client.ts: Add 10s connection timeout to connectViaTcp() to
  prevent indefinite hangs on Windows when reconnecting after forceStop()
- dotnet/test: Change MCP server command from 'echo' to 'true' in the
  Without_Args test. On Ubuntu, 'echo' (no args) outputs a bare newline
  that confuses the CLI's MCP JSON-RPC reader, causing a 2-minute hang.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 dotnet/test/E2E/SessionMcpAndAgentConfigE2ETests.cs | 2 +-
 nodejs/src/client.ts                                | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/dotnet/test/E2E/SessionMcpAndAgentConfigE2ETests.cs b/dotnet/test/E2E/SessionMcpAndAgentConfigE2ETests.cs
index 1fd7feedd..cc528b219 100644
--- a/dotnet/test/E2E/SessionMcpAndAgentConfigE2ETests.cs
+++ b/dotnet/test/E2E/SessionMcpAndAgentConfigE2ETests.cs
@@ -48,7 +48,7 @@ public async Task Should_Accept_MCP_Server_Configuration_Without_Args()
         {
             ["test-server"] = new McpStdioServerConfig
             {
-                Command = "echo",
+                Command = "true",
                 Tools = ["*"]
             }
         };
diff --git a/nodejs/src/client.ts b/nodejs/src/client.ts
index 6342b6667..8a2fe32b4 100644
--- a/nodejs/src/client.ts
+++ b/nodejs/src/client.ts
@@ -1757,7 +1757,13 @@ export class CopilotClient {
         return new Promise((resolve, reject) => {
             this.socket = new Socket();
 
+            const connectionTimeout = setTimeout(() => {
+                this.socket?.destroy();
+                reject(new Error("Timeout connecting to CLI server"));
+            }, 10000);
+
             this.socket.connect(this.actualPort!, this.actualHost, () => {
+                clearTimeout(connectionTimeout);
                 // Create JSON-RPC connection
                 this.connection = createMessageConnection(
                     new StreamMessageReader(this.socket!),
@@ -1770,6 +1776,7 @@ export class CopilotClient {
             });
 
             this.socket.on("error", (error) => {
+                clearTimeout(connectionTimeout);
                 reject(new Error(`Failed to connect to CLI server: ${error.message}`));
             });
         });