## Why Shell snapshots are currently session-scoped even though shell and cwd are properties of a selected turn environment. That makes snapshot refresh depend on separate session-cwd plumbing, prevents retained environments from retaining their snapshot work, and can make snapshot construction use a different shell than command execution. This follows #27955 by making the retained thread-environment service own environment snapshot lifecycles. Session configuration remains the requested selection state, while `ThreadEnvironments` remains the source of successfully resolved environments. ## What changed - Configure the shell-snapshot builder before initial environment resolution. - Start each local environment snapshot task when its `TurnEnvironment` is built and retain that shared task while environment ID and cwd still match. - Inherit retained environment snapshots into spawned child threads. - Carry the selected `TurnEnvironment` through shell runtimes so snapshot construction and command execution use the same environment-specific shell and cwd. - Load project instructions and warm plugins/skills after initial environment resolution. - Continue decoding invalid UTF-8 instruction files lossily without emitting a startup warning. - Keep requested selections in `SessionConfiguration`; failed or duplicate resolutions only affect the resolved environment snapshot. ## Validation - `cargo check -p codex-core --tests` - `just test -p codex-home instructions` (6 passed) - Focused environment, instruction, shell-snapshot, and user-shell tests (84 passed) - Focused shell-snapshot, user-shell, and unified-exec tests (126 passed; two event-timing tests passed on retry)
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.
