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## Why When a turn needs a follow-up request after tool output is recorded, Codex can still appear stuck in `Thinking` before the next `/responses` request is opened. The existing local trace showed the last completed response and the absence of a new backend request, but it did not show whether the stall was in tool-router preparation or later request setup. Issue: N/A (internal incident investigation) ## What Changed Added trace spans around the pre-stream tool-router handoff in `core/src/session/turn.rs`, including the `built_tools` phase and the MCP manager read lock. Added per-server MCP tool-listing spans and trace breadcrumbs in `codex-mcp/src/connection_manager.rs` with startup snapshot / startup-complete state so a pending MCP client is visible in feedback logs instead of looking like a silent hang. ## Verification - `just fmt` - `just test -p codex-mcp` - `just test -p codex-core` (prior full rerun fails in this workspace on unrelated integration tests: code-mode output length expectations, one shell timeout formatting assertion, and shell snapshot timeouts; latest review-fix rerun compiled and passed 1160 tests before I stopped the abnormally slow unrelated suite)
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.