## Why Extensions can observe thread and turn lifecycle events today, but there was no single host-owned hook for changes to the effective thread configuration. That makes features that need to react to model, permission, or tool-suggest updates either depend on individual mutation paths or risk going stale after runtime config refreshes. This adds a typed config-change contributor so extension-owned state can stay synchronized with the effective thread config while the host remains responsible for deciding when config changed. ## What Changed - Added `ConfigContributor<C>` to `codex_extension_api`, with before/after immutable snapshots of the effective config plus session/thread extension stores. - Added registry builder/accessor support through `config_contributor` and `config_contributors`. - Emits config-change callbacks after committed updates from session settings, per-turn setting updates, and `refresh_runtime_config`. - Builds effective config snapshots only when config contributors are registered, and suppresses no-op callbacks when the before/after snapshots are equal. - Added a core session regression test that verifies contributors observe both model changes and user-layer runtime config changes, including access to session and thread extension stores. ## Validation Added `config_change_contributor_observes_effective_config_changes` in `codex-rs/core/src/session/tests.rs` to cover the new contributor path.
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, 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.
