Files
codex/codex-rs/app-server-test-client
Alexi Christakis e92c952b2e [codex] Add user input client ids (#24653)
## Summary

Adds an optional `clientId` field to app-server v2 `UserInput` and
carries it through the core `UserInput` model so clients can correlate
echoed user input items without relying on payload equality.

## Details

- Adds `client_id: Option<String>` to core `UserInput` variants.
- Exposes the v2 app-server field as `clientId` on the wire and in
generated TypeScript.
- Preserves the id when converting between app-server v2 and core
protocol types.
- Regenerates app-server schema fixtures.

## Validation

- `just fmt`
- `just write-app-server-schema`
- `cargo test -p codex-app-server-protocol`
- `cargo test -p codex-protocol`
- `just fix -p codex-app-server-protocol`
- `just fix -p codex-protocol`
- `git diff --check`
2026-05-28 14:54:39 -07:00
..

App Server Test Client

Quickstart for running and hitting codex app-server.

Quickstart

Run from <reporoot>/codex-rs.

# 1) Build debug codex binary
cargo build -p codex-cli --bin codex

# 2) Start websocket app-server in background
cargo run -p codex-app-server-test-client -- \
  --codex-bin ./target/debug/codex \
  serve --listen ws://127.0.0.1:4222 --kill

# 3) Call app-server (defaults to ws://127.0.0.1:4222)
cargo run -p codex-app-server-test-client -- model-list

Watching Raw Inbound Traffic

Initialize a connection, then print every inbound JSON-RPC message until you stop it with Ctrl+C:

cargo run -p codex-app-server-test-client -- watch

Testing Thread Rejoin Behavior

Build and start an app server using commands above. The app-server log is written to /tmp/codex-app-server-test-client/app-server.log

1) Get a thread id

Create at least one thread, then list threads:

cargo run -p codex-app-server-test-client -- send-message-v2 "seed thread for rejoin test"
cargo run -p codex-app-server-test-client -- thread-list --limit 5

Copy a thread id from the thread-list output.

2) Rejoin while a turn is in progress (two terminals)

Terminal A:

cargo run --bin codex-app-server-test-client -- \
  resume-message-v2 <THREAD_ID> "respond with thorough docs on the rust core"

Terminal B (while Terminal A is still streaming):

cargo run --bin codex-app-server-test-client -- thread-resume <THREAD_ID>