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code-mode: introduce durable session interface (#24180)

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## Summary

Introduce a `CodeModeSession` interface for executing and managing
code-mode cells.

This moves cell lifecycle, callback delegation, termination, and
shutdown behind a session abstraction, while continuing to use the
existing in-process implementation, and the ability to implement an
external process one behind this interface.

A Codex session owns one `CodeModeSession`, which in turn owns its
running cells and stored code-mode state. Each cell is represented to
the caller as a `StartedCell`, exposing its cell ID and initial
response.

It also introduces a `CodeModeSessionDelegate` callback interface. A
session uses the delegate to invoke nested host tools and emit
notifications while a cell is running, allowing the runtime to
communicate with its owning Codex session without depending directly on
core turn handling.

<img width="2121" height="1001" alt="image"
src="https://github.com/user-attachments/assets/c349a819-2a59-485c-bda4-2caf68ac4c31"
/>
This commit is contained in:
Channing Conger
2026-05-29 11:42:52 -07:00
committed by GitHub
Unverified
parent 451b386442
commit c9dc0f6338
11 changed files with 1056 additions and 458 deletions
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codex-rs/code-mode/src/lib.rs
+11 -2
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@@ -29,9 +29,18 @@ pub use runtime::WaitOutcome;
pub use runtime::WaitRequest;
pub use runtime::WaitToPendingOutcome;
pub use runtime::WaitToPendingRequest;
pub use service::CellId;
pub use service::CodeModeService;
pub use service::CodeModeTurnHost;
pub use service::CodeModeTurnWorker;
pub use service::CodeModeSession;
pub use service::CodeModeSessionDelegate;
pub use service::CodeModeSessionProvider;
pub use service::CodeModeSessionProviderFuture;
pub use service::CodeModeSessionResultFuture;
pub use service::InProcessCodeModeSessionProvider;
pub use service::NoopCodeModeSessionDelegate;
pub use service::NotificationFuture;
pub use service::StartedCell;
pub use service::ToolInvocationFuture;
pub const PUBLIC_TOOL_NAME: &str = "exec";
pub const WAIT_TOOL_NAME: &str = "wait";