## Why `ext/skills` currently depends on `codex-core` for two host concerns: reading the concrete `Config` type and borrowing core-owned model-context fragment types. That coupling prevents the extension from being assembled independently above core and leaves context that belongs to the skills feature owned by core. This stacked PR introduces the host boundary needed for the broader extension migration while intentionally preserving existing skills behavior. It is stacked on #27404. ## What changed - Adds a small public `SkillsExtensionConfig` view and makes skills installation generic over the host config type. - Requires the host to map its config into that view; app-server supplies the current `Config` values. - Moves the available-skills and selected-skill context fragment implementations into `ext/skills`, preserving their roles, markers, and rendered bytes. - Removes the direct `codex-core` dependency from `codex-skills-extension`. - Keeps local discovery, invocation, side effects, and the `codex-core-skills` compatibility types unchanged for later staged PRs. ## Behavior This adds no capability and is intended to have no user-visible or model-visible behavior change. The install API and ownership boundary change internally; emitted skills context remains byte-for-byte compatible. ## Validation - Updates the skills extension integration coverage to use a host-owned test config. - Asserts the complete rendered catalog and selected-skill fragments, including their roles and markers. - `just bazel-lock-check` - Rust tests and Clippy were not run locally per request; CI will run them.
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.
