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codex/codex-rs/app-server-protocol
riley-oai 82d4a98912 Add cancellation for native user-verification RPCs (#43925)
## Why

Canceling an elicitation does not stop a separate native verification RPC. Clients need a way to cancel that work and prevent a canceled proof from being delivered while it waits for outbound queue capacity.

## What changed

- Add experimental `userVerification/cancel` with `{requestId}` to signal cancellation of status, enroll, delete, or verify requests on the same connection.
- Return an empty acknowledgment without waiting for native work to exit. Unknown, finished, unrelated, and other-connection requests are no-ops.
- Retain request cancellation state until outbound capacity is available so canceled proofs are checked before enqueueing. Already enqueued responses and completed effects cannot be retracted.
- Document the API, request ID requirements, and independent lifetimes of elicitations and native verification RPCs.

## Testing

Add coverage for experimental opt-in, parameter validation, connection and request ID isolation, cancellation before native dispatch, repeated cancellation, worker-slot retention, and proof cancellation while waiting for outbound capacity.

GitOrigin-RevId: 03fcb83fcc5fab4169c68668822fc0bbb4970938
2026-09-08 21:48:53 +00:00
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