e9135fa7c5
# Preserve PATH precedence & fix Windows MCP env propagation ## Problem & intent Preserve user PATH precedence and reduce Windows setup friction for MCP servers by avoiding PATH reordering and ensuring Windows child processes receive essential env vars. - Addresses: #4180 #5225 #2945 #3245 #3385 #2892 #3310 #3457 #4370 - Supersedes: #4182, #3866, #3828 (overlapping/inferior once this merges) - Notes: #2626 / #2646 are the original PATH-mutation sources being corrected. --- ## Before / After **Before** - PATH was **prepended** with an `apply_patch` helper dir (Rust + Node wrapper), reordering tools and breaking virtualenvs/shims on macOS/Linux. - On Windows, MCP servers missed core env vars and often failed to start without explicit per-server env blocks. **After** - Helper dir is **appended** to PATH (preserves user/tool precedence). - Windows MCP child env now includes common core variables and mirrors `PATH` → `Path`, so typical CLIs/plugins work **without** per-server env blocks. --- ## Scope of change ### `codex-rs/arg0/src/lib.rs` - Append temp/helper dir to `PATH` instead of prepending. ### `codex-cli/bin/codex.js` - Mirror the same append behavior for the Node wrapper. ### `codex-rs/rmcp-client/src/utils.rs` - Expand Windows `DEFAULT_ENV_VARS` (e.g., `COMSPEC`, `SYSTEMROOT`, `PROGRAMFILES*`, `APPDATA`, etc.). - Mirror `PATH` → `Path` for Windows child processes. - Small unit test; conditional `mut` + `clippy` cleanup. --- ## Security effects No broadened privileges. Only environment propagation for well-known Windows keys on stdio MCP child processes. No sandbox policy changes and no network additions. --- ## Testing evidence **Static** - `cargo fmt` - `cargo clippy -p codex-arg0 -D warnings` → **clean** - `cargo clippy -p codex-rmcp-client -D warnings` → **clean** - `cargo test -p codex-rmcp-client` → **13 passed** **Manual** - Local verification on Windows PowerShell 5/7 and WSL (no `unused_mut` warnings on non-Windows targets). --- ## Checklist - [x] Append (not prepend) helper dir to PATH in Rust and Node wrappers - [x] Windows MCP child inherits core env vars; `PATH` mirrored to `Path` - [x] `cargo fmt` / `clippy` clean across touched crates - [x] Unit tests updated/passing where applicable - [x] Cross-platform behavior preserved (macOS/Linux PATH precedence intact)
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 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. If you use npm:
npm install -g @openai/codex
Alternatively, if you use Homebrew:
brew install --cask codex
Then simply run codex to get started:
codex
If you're running into upgrade issues with Homebrew, see the FAQ entry on brew upgrade codex.
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. If you previously used an API key for usage-based billing, see the migration steps. If you're having trouble with login, please comment on this issue.
Model Context Protocol (MCP)
Codex can access MCP servers. To configure them, refer to the config docs.
Configuration
Codex CLI supports a rich set of configuration options, with preferences stored in ~/.codex/config.toml. For full configuration options, see Configuration.
Docs & FAQ
- Getting started
- Sandbox & approvals
- Authentication
- Automating Codex
- Advanced
- Zero data retention (ZDR)
- Contributing
- Install & build
- FAQ
- Open source fund
License
This repository is licensed under the Apache-2.0 License.