Channing Conger b3e1c33776 code-mode: define process host wire protocol (#29804) ...

## Why

The process-owned code mode implementation needs an explicit, bounded
wire contract before either side depends on it. Keeping framing and
message semantics in `codex-code-mode-protocol` gives the client and
sidecar one shared source of truth and makes compatibility failures
detectable during connection setup.

## What changed

- adds a versioned client/host handshake with required and optional
capabilities
- defines operation requests and responses for session lifecycle and
cell control
- defines reverse delegate request, response, cancellation, and
cell-closure messages
- adds a four-byte little-endian length-prefixed JSON codec with a hard
frame cap
- rejects malformed frames, unknown fields, invalid identifiers, and
unsupported protocol states
- locks the wire representation down with explicit JSON round-trip tests

## Testing

- `just test -p codex-code-mode-protocol`

## Stack

Part 1 of 6. Followed by
[#29805](https://github.com/openai/codex/pull/29805).

b3e1c33776 · 2026-06-24 20:03:22 -07:00

History

..

src

code-mode: define process host wire protocol (#29804)

2026-06-24 20:03:22 -07:00

BUILD.bazel

code-mode standalone: extract protocol and add host crate (#27724)

2026-06-11 22:37:26 -07:00

Cargo.toml

code-mode standalone: extract protocol and add host crate (#27724)

2026-06-11 22:37:26 -07:00