f2620e7c8b
Add an experimental codex/events MCP capability so external servers can opt into runtime event notifications during initialize. Servers advertise the exact event types they want via capabilities.experimental["codex/events"].eventTypes, and Codex only forwards matching events to those servers. Forwarded notifications use method codex/event and preserve the existing event payload shape used by the built-in MCP server: params._meta.threadId carries the conversation/thread identifier, while the Event itself is flattened into params.id and params.msg. That keeps context metadata separate from the event body while avoiding an extra wrapper object. The core session now publishes each event to the existing tx_event channel as before, then performs best-effort fanout to the MCP connection manager. Fanout skips servers that are still starting up, ignores servers that did not subscribe to the emitted msg.type, and logs notification failures without breaking the main turn flow. Add tests for generic experimental capability detection and for loading codex/events eventTypes from the MCP initialize response, including the no-eventTypes case which intentionally subscribes to nothing.
npm i -g @openai/codex
or brew install --cask codex
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
Install globally with your preferred package manager:
# 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, Team, 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.