## Why Research and training setups need to control which tool namespaces appear inside code mode's nested `tools` surface without disabling those tools entirely. This makes it possible to train against a deliberately reduced nested-tool setup while preserving the normal direct and deferred tool paths. ## What - Extend `features.code_mode` to accept structured configuration while preserving the existing boolean syntax. - Add an exact `excluded_tool_namespaces` list under `[features.code_mode]`: ```toml [features.code_mode] enabled = true excluded_tool_namespaces = ["mcp__codex_apps", "multi_agent_v1"] ``` - Filter matching canonical `ToolName` namespaces when constructing code mode's nested router and code-mode-specific direct tool descriptions. - Keep excluded tools registered, directly exposed in mixed code mode, and discoverable through top-level `tool_search` when otherwise eligible. - Derive deferred nested-tool guidance after namespace filtering so the `exec` description does not advertise excluded-only deferred tools. - Preserve the boolean/table representation when materializing config locks and update the generated config schema. ## Testing - `just test -p codex-features` - `just test -p codex-config` - `just test -p codex-core load_config_resolves_code_mode_config` - `just test -p codex-core lock_contains_prompts_and_materializes_features` - `just test -p codex-core excluded_deferred_namespaces_do_not_enable_nested_tool_guidance` - `just test -p codex-core code_mode_excludes_configured_nested_tool_namespaces` - `cargo check -p codex-thread-manager-sample`
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.
