## Why Multi-agent delegation policy was split across `multiAgentMode`, `features.multi_agent_mode`, and `usage_hint_enabled`. These controls could disagree: a requested mode could be downgraded by the feature flag, and disabling usage hints also disabled mode instructions. Some clients also need multi-agent tools without adding delegation-policy text to model context. The previous two-mode API could not express that directly. ## What changed `multiAgentMode` is now the only live delegation-policy control: | Mode | Behavior | | --- | --- | | `none` | Keep multi-agent tools available without adding mode instructions. | | `explicitRequestOnly` | Only delegate after an explicit user request. | | `proactive` | Delegate when parallel work materially improves speed or quality. | - new threads default to `explicitRequestOnly`; omitting the mode on later turns keeps the current value - thread start, resume, fork, and settings responses always report the concrete current mode instead of `null` - mode selection remains sticky across turns and resume - usage-hint text no longer controls whether mode instructions apply - `features.multi_agent_mode` and `usage_hint_enabled` remain accepted as ignored compatibility settings so existing configs continue to load - app-server documentation and generated schemas describe the three-mode API ## Tests - `just test -p codex-core multi_agent_mode` - `just test -p codex-core multi_agent_v2_config_from_feature_table` - `just test -p codex-core spawn_agent_description` - `just test -p codex-features` - `just test -p codex-app-server-protocol` - `just test -p codex-app-server multi_agent_mode`
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.
