Owen Lin 5121aeff13 Overlap subagent spawn persistence and clean up cancelled children (#47348) ...

## Why

Forked subagent startup serializes history persistence and spawn-edge writes. Cancellation during startup can also leave a provisional child behind.

## What changed

- Defer copied-history durability so it can run alongside spawn-edge persistence, while still awaiting both before submitting the child's initial input.
- Commit agent and residency reservations and notify clients only after initial input is accepted.
- Guard provisional children so cancellation or startup failure removes and shuts them down, discards their stored state, and closes their spawn edge after any pending edge write finishes.

## Testing

Add coverage for cancellation at the child-history durability barrier, checking child termination, removal, and edge closure. Extend fork-context tests in legacy and paginated history modes to verify inherited context can be read from storage after spawn acknowledgment without flushing the live child first.

GitOrigin-RevId: e02dda57efc32b7237bb7af0ce5e5844922890c3

2026-09-22 19:39:18 +00:00

..

common

Wire agent message boards into persistent multi-agent runtimes (#47017)

2026-09-21 12:35:36 +00:00

remote_env_windows

Apply remote platform semantics to exec safety checks (#42113)

2026-09-01 18:24:56 +00:00

suite

Overlap subagent spawn persistence and clean up cancelled children (#47348)

2026-09-22 19:39:18 +00:00

all.rs

[codex] Use expect in integration tests (#28441)

2026-06-15 21:53:47 -07:00

mcp_trace_propagation.rs

Preserve MCP request trace context across transport workers (#47212)

2026-09-22 06:47:07 +00:00

responses_headers.rs

Support explicit provider model catalog URLs (#46561)

2026-09-19 01:36:53 +00:00