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Expose parent context for host-managed child startup (#58390)

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## What changed

Replace `PreparedThreadSpawn` with `PreparedChildContext`. `CodexThread::prepare_child` now captures parent inputs from a live tool invocation without requiring a child request. Hosts choose the child's name, role, and history, bind destination services, and apply child settings.

Expose captured instructions, environments, permissions, approval settings, disabled plugins, current inheritable dynamic tools, and an execution-policy snapshot with its original managed requirements. Retain those requirements across MCP configuration refreshes so hosts can assess policy-source compatibility.

Remove `ThreadManager::create_prepared_child`; `CodexThread::create_child` handles reserved child startup on the parent's manager with invocation-bound cancellation and cleanup.

## Testing

Add coverage for execution-policy snapshots and managed requirements after MCP refresh. Update child-spawn tests to verify captured instructions and permissions, current dynamic-tool declarations, and fresh versus forked history.

GitOrigin-RevId: f15b595b44997fa70cd0c9be0e92f470e1f333e1
This commit is contained in:
rhan-oai
2026-10-30 17:08:41 +00:00
committed by copyberry
parent 4c8f6971cb
commit cbe16d525c
16 changed files with 323 additions and 765 deletions
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codex-rs/core/src/codex_thread.rs
+6 -7
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@@ -284,7 +284,8 @@ impl CodexThread {
/// Creates an idle V2 child here with the invoking step's environments and live application
/// bindings. Compatible children share the parent's exec policy.
/// Ending the invocation or dropping this future aborts pending startup.
/// [`crate::ThreadManager::create_prepared_child`] defines acceptance and cleanup.
/// Success publishes the idle child and transfers ownership to the host. An error or dropped
/// future schedules cleanup of any provisional child. Already-durable history may remain.
pub async fn create_child(
&self,
invocation: &crate::ToolInvocationContext,
@@ -294,15 +295,13 @@ impl CodexThread {
crate::agent::host::create(self, invocation, request, reservation).await
}
/// Captures inputs from a live invocation for [`crate::ThreadManager::create_prepared_child`].
/// The host owns cancellation and snapshot freshness after this returns. Detached preparation
/// rejects managed application network, auth, and cloud config bindings.
/// Reads the parent settings for this live tool invocation, including the dynamic tools
/// currently inheritable by a fresh child. The host chooses the child's name, role, and history.
pub async fn prepare_child(
&self,
invocation: &crate::ToolInvocationContext,
request: crate::ThreadCreateRequest,
) -> Result<crate::PreparedThreadSpawn, crate::ThreadSpawnError> {
crate::agent::host::prepare(self, invocation, request).await
) -> Result<crate::PreparedChildContext, crate::ThreadSpawnError> {
crate::agent::host::prepare(self, invocation).await
}
/// Returns extension-owned data attached to this thread runtime.