Ahmed Ibrahim d7e8f4c3dc Preserve user input when MCP startup is interrupted (#34839)
## Why

Interrupting a turn while MCP tools were still starting could abort before the
submitted user input was recorded in conversation history.

## What changed

- Build and retain the MCP tool list and tool router as part of each step
  snapshot, using the turn cancellation token during tool discovery.
- Record turn hooks and submitted input when cancellation occurs during startup
  prewarming, pre-sampling compaction, or first-step capture.
- Reuse the captured router for sampling, compaction, and prompt debugging so
  advertised and executable tools share the same request-scoped view.

## Testing

Add coverage that interrupts each affected MCP startup phase and verifies that
the user prompt remains in history before the turn-aborted marker.

GitOrigin-RevId: 6e96c6814357a55545d69b580e28f35933cfadf7
2026-07-22 22:50:13 +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

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This repository is licensed under the Apache-2.0 License.

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