A tiny interactive client for codex app-server (protocol v2 only). It prints all JSON-RPC lines from the server and lets you send new turns as you type.

Usage

Start the app-server client (it will spawn codex app-server itself):

cargo run -p codex-debug-client -- \
  --codex-bin codex \
  --approval-policy on-request

You can resume a specific thread:

cargo run -p codex-debug-client -- --thread-id thr_123

CLI flags

--codex-bin <path>: path to the codex binary (default: codex).
-c, --config key=value: pass through --config overrides to codex.
--thread-id <id>: resume a thread instead of starting a new one.
--approval-policy <policy>: untrusted, on-failure, on-request, never.
--auto-approve: auto-approve command/file-change approvals (default: decline).
--final-only: only show completed assistant messages and tool items.
--model <name>: optional model override for thread start/resume.
--model-provider <name>: optional provider override.
--cwd <path>: optional working directory override.

Interactive commands

Type a line to send it as a new turn. Commands are prefixed with ::

:help show help
:new start a new thread
:resume <thread-id> resume a thread
:use <thread-id> switch active thread without resuming
:refresh-thread list available threads
:quit exit

The prompt shows the active thread id. Client messages (help, errors, approvals) print to stderr; raw server JSON prints to stdout so you can pipe/record it unless --final-only is set.

Notes

The client performs the required initialize/initialized handshake.
It prints every server notification and response line as it arrives.
Approvals for item/commandExecution/requestApproval and item/fileChange/requestApproval are auto-responded to with decline unless --auto-approve is set.