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## Why
The selected-capability integration test already covers initial
attachment and cold resume, but it resumes while the selected executor
is still reachable.
That leaves an important World State transition untested: a thread
remembers its selected capability root, resumes while that environment
is unavailable, and later sees the same stable environment return.
## What this tests
This extends the existing end-to-end scenario:
```text
selected executor available
↓
app-server stops and the executor goes away
↓
thread resumes with the executor unavailable
↓
skills, selected MCP tools, and connector attribution are absent
↓
the same environment ID is attached again
↓
skills, MCP tools, and connector attribution return
```
The test also checks that the unavailable snapshot explicitly tells the
model that no selected-environment skills are currently available. After
reattachment, it invokes the selected skill again and verifies that a
new executor-owned MCP process starts.
## Scope
This is test-only. It keeps the existing assumption that an environment
ID refers to stable capability contents. It does not add package-file
invalidation or live transport reconnect behavior.
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
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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.
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Docs
This repository is licensed under the Apache-2.0 License.