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## Why Codex currently accepts dynamic tool names and namespaces that the upstream Responses function-tool path does not actually support. In practice, that means app-server can register a dynamic tool successfully and only discover later that the LLM-facing tool contract will reject or mishandle it. This PR tightens the app-server-side dynamic tool contract to match the Responses API before we stack dynamic tool hook support on top of it. ## What changed - validate dynamic tool `name` against the Responses function-tool identifier contract: `^[a-zA-Z0-9_-]+$`, length `1..128` - validate dynamic tool `namespace` the same way, with the Responses namespace length limit `1..64` - reject namespaces that collide with the always-reserved Responses runtime namespaces such as `functions`, `multi_tool_use`, `file_search`, `web`, `browser`, `image_gen`, `computer`, `container`, `terminal`, `python`, `python_user_visible`, `api_tool`, `tool_search`, and `submodel_delegator` - escape invalid identifiers in error messages so control characters do not spill raw into logs or client-visible error text - document the tightened dynamic tool identifier contract in `codex-rs/app-server/README.md` - add both unit coverage for the validator and an app-server integration test that rejects a `thread/start` request with Responses-incompatible dynamic tool identifiers ## Verification - `cargo test -p codex-app-server validate_dynamic_tools_` - `cargo test -p codex-app-server --test all thread_start_rejects_dynamic_tools_not_supported_by_responses`
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.