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## Why Full-history agent forks should continue from the same prompt prefix as the parent. Dropping the stored `TurnContext` baseline forced the child to rebuild startup context on its first turn, which can duplicate developer instructions and also loses the cache continuity that a full-history fork is supposed to preserve. Truncated forks are different: once we keep only the last N turns, the original prompt prefix is no longer intact, so the child must establish a fresh context baseline. ## What changed - Preserve `RolloutItem::TurnContext` when forking with `SpawnAgentForkMode::FullHistory`, and keep dropping it for truncated forks:4090717d94/codex-rs/core/src/agent/control.rs (L98-L126)and4090717d94/codex-rs/core/src/agent/control.rs (L399-L401)- Remove the special-case MultiAgentV2 usage-hint filtering path. Full-history fork now preserves the cached developer prefix instead of trying to reconstruct part of it. - Extend the fork coverage to assert both sides of the contract: full-history forks keep the parent reference baseline, while last-N forks rebuild context after truncation:4090717d94/codex-rs/core/src/agent/control_tests.rs (L603-L759)and4090717d94/codex-rs/core/src/agent/control_tests.rs (L854-L977)## Verification - `cargo test -p codex-core spawn_agent_can_fork_parent_thread_history_with_sanitized_items -- --nocapture` - `RUST_MIN_STACK=16777216 cargo test -p codex-core spawn_agent_fork_last_n_turns_keeps_only_recent_turns -- --nocapture`
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.