776246c3f5
## Summary When a `spawn_agent` call does a full-history fork, keep the parent's effective agent type and model configuration instead of applying child role/model overrides. This is the minimal config-inheritance slice of #16055. Prompt-cache key inheritance and MCP tool-surface stability are split into follow-up PRs. ## Design - Reject `agent_type`, `model`, and `reasoning_effort` for v1 `fork_context` spawns. - Reject `agent_type`, `model`, and `reasoning_effort` for v2 `fork_turns = "all"` spawns. - Keep v2 partial-history forks (`fork_turns = "N"`) configurable; requested model/reasoning overrides and role config still apply there. - Keep non-forked spawn behavior unchanged. ## Tests - `cargo +1.93.1 test -p codex-core spawn_agent_fork_context --lib` - `cargo +1.93.1 test -p codex-core multi_agent_v2_spawn_fork_turns --lib` - `cargo +1.93.1 test -p codex-core multi_agent_v2_spawn_partial_fork_turns_allows_agent_type_override --lib`
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.