## Summary - classify authentication-required RMCP startup failures, including errors nested inside `ClientInitializeError::TransportError` - let `codex-mcp` consume that classification so the existing `reauthenticationRequired` startup failure reason is emitted - add a regression test that performs real startup with an expired persisted OAuth token and no refresh token ## Why Follow-up to #29877. RMCP stores streamable HTTP initialization failures inside a dynamic transport error whose payload is not exposed through the standard Rust error source chain. The original `anyhow::Error::chain()` check therefore missed the nested `AuthError::AuthorizationRequired` seen during real MCP startup and emitted `failureReason: null`. The transport-specific inspection now lives in `codex-rmcp-client`, while `codex-mcp` consumes only the domain-level authentication-required result. This classifier does not distinguish first-time login from reauthentication; the existing auth-state logic remains responsible for that distinction. ## User impact When stored MCP OAuth credentials are expired and cannot be refreshed, app clients now receive `failureReason: "reauthenticationRequired"` on the failed startup update and can show the reconnect action. First-time login and unrelated startup failures remain unchanged. ## Validation - `just test -p codex-rmcp-client --test streamable_http_oauth_startup identifies_expired_unrefreshable_token_startup_error` - `just test -p codex-mcp startup_outcome_error_identifies_authentication_required` - `just test -p codex-mcp mcp_startup_failure_reason_requires_existing_oauth_and_auth_failure` - `cargo build -p codex-cli --bin codex` - local app-server probe emitted `failureReason: "reauthenticationRequired"` - manual end-to-end reconnect flow confirmed - `just fmt`
Codex CLI is a coding agent from OpenAI that runs locally on your computer.
If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run
codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.
Quickstart
Installing and running Codex CLI
Run the following on Mac or Linux to install Codex CLI:
curl -fsSL https://chatgpt.com/codex/install.sh | sh
Run the following on Windows to install Codex CLI:
powershell -ExecutionPolicy ByPass -c "irm https://chatgpt.com/codex/install.ps1 | iex"
Codex CLI can also be installed via the following package managers:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
You can also go to the latest GitHub Release and download the appropriate binary for your platform.
Each GitHub Release contains many executables, but in practice, you likely want one of these:
- macOS
- Apple Silicon/arm64:
codex-aarch64-apple-darwin.tar.gz - x86_64 (older Mac hardware):
codex-x86_64-apple-darwin.tar.gz
- Apple Silicon/arm64:
- Linux
- x86_64:
codex-x86_64-unknown-linux-musl.tar.gz - arm64:
codex-aarch64-unknown-linux-musl.tar.gz
- x86_64:
Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.
Using Codex with your ChatGPT plan
Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Business, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.
You can also use Codex with an API key, but this requires additional setup.
Docs
This repository is licensed under the Apache-2.0 License.
