## What changed
- Add the disabled-by-default `interrupt_on_cancel` feature to interrupt upstream inference when a Responses Lite turn is canceled, with a one-second cleanup deadline.
- Detach canceled WebSocket responses so replacement requests can open a new connection without waiting for cleanup.
- Add an optional `interrupt_on_cancel` override for thread samples, inheriting the parent setting when omitted.
## Testing
Add coverage for cancellation during inference and steering, replacement turns proceeding before cleanup finishes, and prompt cancellation of model response interceptors.
GitOrigin-RevId: 501368746fc04fd3fdbd45c1f34c75ce57f4e955
## What changed
Add optional `threadSource` to `thread/sample` requests and apply it to the ephemeral fork. Keep `thread_sample` as the default when omitted.
## Testing
Extend sampling tests to assert that turn metadata includes the supplied thread source and retains the default when no source is provided.
GitOrigin-RevId: 8ea941c932267e3bcb9e6b086764ac2795d6edef
## What changed
Add optional `responsesapiClientMetadata` to `ThreadSampleParams` and forward it to the sample turn's Responses API metadata. Update the experimental protocol schema.
## Testing
Extend the thread sample integration test to verify that client metadata appears in both the request header and body, preserves the explicit `turn_trigger` when client metadata supplies a conflicting value, and does not carry over to the next parent turn.
GitOrigin-RevId: eb1f80824d476fc6c584a2b35d97e59d51fd4273
## Why
`thread/sample` previously required the latest source turn to have completed successfully, rejecting failed or interrupted turns even when the source was idle.
## What changed
Accept the latest completed, failed, or interrupted turn in both legacy and paginated history modes. Update the protocol documentation and validation error to reflect the accepted statuses, while continuing to reject stale or active sources.
## Testing
Expand integration coverage across all three terminal statuses and both history modes, checking that sampling preserves context and leaves the source unchanged. Also verify that sampling an active source is rejected before interrupting it.
GitOrigin-RevId: a5dfdb2800868ee178eae16b12ee7f6f9515898c
## What changed
Add `experimentalDisablePredictionMcp` to `thread/fork` and `disableMcp` to `thread/sample`. Disable MCP servers when requested and the inherited history contains incremental tools on Responses Lite. The fork option requires `experimentalPredictionMode: true`.
Apply disablement through a thread-local policy that excludes configured MCP servers and runtime contributions, including after MCP refresh. Preserve the inherited history prefix and append tool-removal instructions without changing the parent's tools.
## Testing
Add coverage for prediction forks with legacy and paginated history, flag validation, conditional disablement, MCP refresh, and sample/fork request parity. Add a request-history snapshot covering preserved history, tool removal across child turns, and unchanged parent tools.
GitOrigin-RevId: e31d602480e6550ed130d8152f538b8668280fa0
## What changed
Add the experimental `thread/sample/cancel` request with a `requestId` identifying a `thread/sample` request on the same connection. Cancellation returns an empty response, stops the matching sample with `sample canceled`, and cleans up its ephemeral fork. Repeated cancellation and unknown request IDs are harmless no-ops; other request types are unaffected.
## Testing
Add coverage for connection and request ID isolation, request type filtering, and repeated cancellation. Extend the sample integration test to verify cancellation keeps the parent responsive and reclaims the child thread.
GitOrigin-RevId: 92d12e5c0190e1d3b06cb482543615a3ec77bdc8
## What changed
Add `thread/sample` to collect one model response on an ephemeral fork that inherits a loaded thread's context and configuration. Return the source turn ID, response ID, assistant text, and available token usage without modifying the source conversation.
Require an idle, persistent root thread and an `expectedTurnId` matching its latest completed turn. Reject results if the source history changes during sampling. Keep the parent responsive while sampling, hide sample forks from `thread/loaded/list`, and reclaim them after completion or timeout.
Intercept responses before tool execution or Stop hooks can run, returning null text for tool calls or responses without text. Apply optional reasoning-effort updates only when the provider and model support cache-preserving updates.
## Testing
Add integration coverage for inherited context and reasoning effort, source preservation, tool and Stop hook suppression, invalid requests, stream errors, parent responsiveness, and timeout cleanup.
GitOrigin-RevId: 08f4867e53ec7f6c8f4428d5542eeea4e6dadd0b
liame-oai