codex/codex-rs/app-server-test-client

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>