v1.0.12-preview.0

Feature: rewind support across all SDKs

Sessions now support rewinding conversation history and tracked file changes. Enable file-change tracking when creating a session, then rewind to a previous checkpoint to discard later turns and restore file state. (#2321)

const session = await client.createSession({ enableFileChangeTracking: true });
const rewindPoints = await session.rpc.rewind.listRewindPoints();
await session.rpc.rewind.rewind({ rewindPointId: rewindPoints[0].rewindPointId });

session = await client.create_session(enable_file_change_tracking=True)
rewind_points = await session.rpc.rewind.list_rewind_points()
await session.rpc.rewind.rewind(rewind_point_id=rewind_points[0].rewind_point_id)

session, _ := client.CreateSession(ctx, &copilot.SessionOptions{EnableFileChangeTracking: true})
points, _ := session.RPC.Rewind.ListRewindPoints(ctx)
_ = session.RPC.Rewind.Rewind(ctx, &copilot.RewindRequest{RewindPointId: points[0].RewindPointId})

var session = await client.CreateSessionAsync(new SessionOptions { EnableFileChangeTracking = true });
var points = await session.Rpc.Rewind.ListRewindPointsAsync();
await session.Rpc.Rewind.RewindAsync(new RewindRequest { RewindPointId = points[0].RewindPointId });

SessionOptions options = new SessionOptions().setEnableFileChangeTracking(true);
var session = client.createSession(options).get();
var points = session.getRpc().getRewind().listRewindPoints().get();
session.getRpc().getRewind().rewind(new RewindRequest().setRewindPointId(points.get(0).getRewindPointId())).get();

let session = client.create_session(SessionOptions { enable_file_change_tracking: Some(true), ..Default::default() }).await?;
let points = session.rpc.rewind.list_rewind_points().await?;
session.rpc.rewind.rewind(RewindRequest { rewind_point_id: points[0].rewind_point_id.clone() }).await?;

Feature: Java in-process Copilot CLI (linux-x64)

The Java SDK now supports an in-process connection mode on linux-x64 that loads the Copilot runtime as a native library via JNA — no separate CLI child process required. Add the copilot-sdk-java-runtime classifier JAR for your platform alongside the core SDK JAR. (#2301)

CopilotClientOptions options = new CopilotClientOptions()
    .setConnection(RuntimeConnection.forInProcess());
CopilotClient client = new CopilotClient(options);
client.start().get();

Feature: permission decision context across all SDKs

Permission handlers can now attach decisionContext so the runtime can attribute whether a decision came from a person, host policy, or an automated recommendation. This is additive for all SDKs. Note for Rust: PermissionResult::Decision changed from a tuple variant to a struct variant — callers that construct or match it directly must migrate. (#2294)

return createAttributedPermissionResult("allow_once", { source: "user" });

return copilot.create_attributed_permission_result("allow_once", context)

return copilot.NewAttributedPermissionResult("allow_once", context)

return new PermissionDecision { Result = "allow_once", DecisionContext = context };

return PermissionRequestResult.approveOnce().setDecisionContext(context);

return PermissionResult::Decision { decision: PermissionDecision::ApproveOnce, context: Some(ctx) };

Feature: built-in plugin directory support

Hosts can now register a trusted set of host-bundled plugin directories that are loaded before any session is created, distinct from user-managed --plugin-dir directories. (#2330)

Feature: Node extensions can request sensitive environment variables

Node extensions can now pass an env option to joinSession() listing the sensitive environment variable names they need. The CLI prompts the user for approval; if granted, the variables are written into the extension process before joinSession() resolves. (#2348)

await joinSession({ env: ["MY_SECRET_TOKEN", "API_KEY"] });

Feature: agent factory argsSchema support

FactoryMeta now exposes an optional argsSchema field so factory authors can declare the argument shape their factory expects. The CLI validates call arguments against the schema before starting a run, surfacing malformed calls early without consuming credits. (#2315)

session.defineFactory("my-factory", { argsSchema: { type: "object", properties: { query: { type: "string" } } } }, async (ctx) => { /* ... */ });

Other changes

• bugfix: [Rust] prevent orphaned CLI child processes when the last Client is dropped (#2292)
• improvement: [Node/SDK/Factories] align agent factory types and behavior with the wire contract — FactoryResult/FactoryArguments now typed as JsonValue, ctx.agent() forwards reasoningEffort and contextTier, resume error union trimmed to real codes (#2309)

New contributors

• @lutzroeder made their first contribution in #2330
• @aymenfurter made their first contribution in #2294
• @lukehoban made their first contribution in #2292

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