v1.0.9-preview.0

Feature: agentStop lifecycle hook

Applications can now intercept the natural stopping point of the top-level agent across all SDKs. Return { decision: "block", reason } to enqueue a follow-up message and keep the agent running; omit or return no decision to let it stop normally. (#2054)

session.hooks.agentStop(async ({ stopHookActive }) => {
  if (stopHookActive) return; // don't block continuation turns
  return { decision: "block", reason: "Run final validation and fix any failures." };
});

session.Hooks.AgentStop(async (input, ct) => {
    if (input.StopHookActive) return null; // don't block continuation turns
    return new AgentStopOutput { Decision = "block", Reason = "Run final validation and fix any failures." };
});

Feature: startup timing breakdown for the Rust SDK

Client::start now exposes a StartupTimings struct that breaks down initialization latency into per-phase millisecond fields (process_spawn_ms, transport_setup_ms, handshake_ms, and more), making it easier to diagnose cold-start performance. (#2066)

Feature: [Java] custom JSON schema override for @CopilotToolParam

The @CopilotToolParam annotation now accepts an optional schema attribute for passing an explicit JSON Schema string, enabling support for third-party types that the built-in schema generator cannot automatically map. (#2069)

`@CopilotTool`("Schedule a deployment")
public String scheduleDeployment(
    `@CopilotToolParam`(value = "Deployment time in ISO-8601",
        schema = "{\"type\":\"string\",\"format\":\"date-time\"}")
    com.acme.internal.AcmeDateTime deployTime) { ... }

Other changes

• improvement: [Java] enforce non-blank @CopilotToolParam descriptions at compile time (#1980)
• bugfix: [C#] release oversized JSON-RPC receive buffers after large frames to reduce memory retention (#2047)
• improvement: [Rust] emit type aliases for scalar RPC result schemas in generated code (#2110)

New contributors

• @adirh3 made their first contribution in #2047

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