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## Why This is a follow-up to #15360. That change fixed the `arg0` helper setup, but `rmcp-client` still coerced stdio transport environment values into UTF-8 `String`s before program resolution and process spawn. If `PATH` or another inherited environment value contains non-UTF-8 bytes, that loses fidelity before it reaches `which` and `Command`. ## What changed - change `create_env_for_mcp_server()` to return `HashMap<OsString, OsString>` and read inherited values with `std::env::var_os()` - change `TransportRecipe::Stdio.env`, `RmcpClient::new_stdio_client()`, and `program_resolver::resolve()` to keep stdio transport env values in `OsString` form within `rmcp-client` - keep the `codex-core` config boundary stringly, but convert configured stdio env values to `OsString` once when constructing the transport - update the rmcp-client stdio test fixtures and callers to use `OsString` env maps - add a Unix regression test that verifies `create_env_for_mcp_server()` preserves a non-UTF-8 `PATH` ## How to verify - `cargo test -p codex-rmcp-client` - `cargo test -p codex-core mcp_connection_manager` - `just argument-comment-lint` Targeted coverage in this change includes `utils::tests::create_env_preserves_path_when_it_is_not_utf8`, while the updated stdio transport path is exercised by the existing rmcp-client tests that construct `RmcpClient::new_stdio_client()`.
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, Team, 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.