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Add host-reserved V2 child creation APIs (#57586)

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## What changed

- Add `CodexThread::create_child` to create an idle child from a live tool invocation using a host-reserved thread ID and controller.
- Add `prepare_child` and `ThreadManager::create_prepared_child` to capture inherited settings and fresh or forked history, then start the child on another manager even after the parent shuts down. Reject detached preparation when live bindings cannot be transferred.
- Add opt-in `HostToolInvocationLookup` to track live calls and reject duplicate active call IDs within a turn. Revoke invocation access when dispatch ends and clean up provisional children when startup fails or is cancelled.

## Testing

Add tests for invocation lifetime and call ID reservation, inherited policy and live bindings, detached startup with fresh and full history, and cancellation cleanup.

GitOrigin-RevId: 71f17ecb4cd7636517e675df59289a8e8c7105b8
This commit is contained in:
rhan-oai
2026-10-27 23:02:27 +00:00
committed by copyberry
parent cb66dbecf2
commit 37f199dab1
29 changed files with 2203 additions and 209 deletions
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codex-rs/ext/extension-api/src/message_lifecycle.rs
+1 -1
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@@ -12,7 +12,7 @@ pub struct MessageLifecycleInput {
pub data: ExtensionData,
}
/// Observes messages published through local agent control, where the sender is known.
/// Observes messages from local agent control and the initial task of a host-spawned child.
/// Callbacks are synchronous and must not block. Replaying history or submitting raw
/// protocol input does not create a publication.
pub trait MessageLifecycleContributor: Send + Sync {