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Add a centralized FileWatcher in codex-core (using notify) that watches: * AGENTS.md / AGENTS.override.md and project AGENTS search dirs * Skill roots from the config layer stack (recursive) Send `AgentsChanged` and `SkillsChanged` events when relevant file system changes are detected On `SkillsChanged`: * Invalidate the skills cache immediately in ThreadManager * Emit EventMsg::SkillsUpdateAvailable to active sessions * Broadcast a new app-server notification: skills/list/updated On `AgentsChanged`: * Set a per-session agents_changed flag scoped to relevant watch dirs * On the next user turn, recompute skills + user instructions and inject an updated UserInstructions item into the event stream Wire the watcher through ThreadManager -> Codex::spawn -> SessionServices, including sub-agent sessions. Refactor project_doc discovery to expose project_doc_search_dirs for shared watch-dir computation. Add SkillsListUpdatedNotification to the app-server protocol and gate broadcast until after initialize. Testing: I did a bunch of manual testing of both AGENTS and skills updates. They work surprisingly well. Skill addition and removal are both handled seamlessly in both the UI and in the behavior of the agent on the next turn. Changes to skill details were picked up and followed on the next turn. Additions and modifications to AGENTS.md were followed well. The only failure that I found was when I deleted a major block of instructions from AGENTS.md. In that case, the model still followed those instructions from the older AGENTS.md because it was still in the context window.
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 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.