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## Why `ToolExecutor` is the runtime contract that keeps a callable tool and its model-visible spec together. Leaving `spec()` optional lets a registered runtime silently omit that half of the contract, and it also overloads a missing spec as an exposure decision for tools that should stay dispatchable without being shown to the model. ## What - Make `ToolExecutor::spec()` required and update core, extension, and test tool executors to return a concrete `ToolSpec`. - Add `ToolExposure::Hidden` for dispatch-only tools. The legacy `shell_command` runtime in unified-exec sessions now uses that explicit exposure instead of hiding itself by omitting a spec. - Build MCP tool specs when `McpHandler` is constructed so invalid MCP specs are skipped before the handler is registered. - Keep tool planning aligned with the new contract for direct, deferred, hidden, code-mode, dynamic, and namespaced tool paths. ## Testing - Added tool-plan coverage that invalid MCP tool specs are not registered. - Updated shell-family coverage for the hidden legacy `shell_command` runtime and the affected tool executor test fixtures.
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.