rhan-oai 2dbe6bfa44 Cancel MCP tool requests when response futures are dropped (#56132)
## Why

Dropping a local tool-call future did not notify the MCP server that the request was cancelled, leaving remote work running.

## What changed

- Send a cancellation notification for the request when its response future is dropped, covering both ordinary tool calls and tool-input rounds.
- Preserve write order for stdio and in-process transports so cancellation cannot arrive before its tool request, without waiting for tool responses.

## Testing

Add regression tests for cancellation on drop, request-before-cancellation ordering under reversed send polling and exhausted task budgets, and continued use of the shared connection after cancellation.

GitOrigin-RevId: fab02d546fd82c601756117d9ecbf1017c28ac11
2026-10-22 09:57:51 +00:00
2026-04-24 17:49:29 -07:00
2025-04-16 12:56:08 -04:00
2025-04-16 12:56:08 -04:00
2026-04-24 17:49:29 -07:00
2026-08-21 16:45:05 +00:00

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