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## Why The goal extension needs a way to resume an active goal after the thread becomes idle, but the old core goal runtime should not be refactored as part of this step. The missing piece is a small core-owned turn-start primitive: let an extension ask for a normal model turn only when the thread is idle, and otherwise fail without injecting into whatever is currently active. ## What Changed - Adds `CodexThread::try_start_turn_if_idle(...)` as the narrow extension-facing primitive for synthetic idle work. - Implements the session side so it refuses to start when: - the provided input is empty, - the session is in plan mode, - a turn is already active, or - trigger-turn mailbox work is pending. - Gives trigger-turn mailbox work priority if it appears while the idle turn is being prepared. - Wires `GoalExtension::on_thread_idle` to read the active persisted goal and submit the continuation prompt through this idle-only primitive. - Keeps the legacy core goal continuation implementation in place instead of folding it into this PR. ## Behavior This is intentionally best-effort. If `try_start_turn_if_idle` observes that the thread is not idle, or that higher-priority mailbox work should run first, it returns the input to the caller. The goal extension drops that continuation prompt and waits for a future idle opportunity instead of injecting stale synthetic goal text into an active turn. ## Validation - `just test -p codex-core try_start_turn_if_idle_rejects_active_turn_without_injecting` - `just test -p codex-goal-extension`
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.