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Users were running into issues with glibc mismatches on arm64 linux. In the past, we did not provide a musl build for arm64 Linux because we had trouble getting the openssl dependency to build correctly. Though today I just tried the same trick in `Cargo.toml` that we were doing for `x86_64-unknown-linux-musl` (using `openssl-sys` with `features = ["vendored"]`), so I'm not sure what problem we had in the past the builds "just worked" today! Though one tweak that did have to be made is that the integration tests for Seccomp/Landlock empirically require longer timeouts on arm64 linux, or at least on the `ubuntu-24.04-arm` GitHub Runner. As such, we change the timeouts for arm64 in `codex-rs/linux-sandbox/tests/landlock.rs`. Though in solving this problem, I decided I needed a turnkey solution for testing the Linux build(s) from my Mac laptop, so this PR introduces `.devcontainer/Dockerfile` and `.devcontainer/devcontainer.json` to facilitate this. Detailed instructions are in `.devcontainer/README.md`. We will update `dotslash-config.json` and other release-related scripts in a follow-up PR.
Codex CLI (Rust Implementation)
We provide Codex CLI as a standalone, native executable to ensure a zero-dependency install.
Installing Codex
Today, the easiest way to install Codex is via npm, though we plan to publish Codex to other package managers soon.
npm i -g @openai/codex@native
codex
You can also download a platform-specific release directly from our GitHub Releases.
Config
Codex supports a rich set of configuration options. See config.md for details.
Model Context Protocol Support
Codex CLI functions as an MCP client that can connect to MCP servers on startup. See the mcp_servers section in the configuration documentation for details.
It is still experimental, but you can also launch Codex as an MCP server by running codex mcp. Using the @modelcontextprotocol/inspector is
npx @modelcontextprotocol/inspector codex mcp
Code Organization
This folder is the root of a Cargo workspace. It contains quite a bit of experimental code, but here are the key crates:
core/contains the business logic for Codex. Ultimately, we hope this to be a library crate that is generally useful for building other Rust/native applications that use Codex.exec/"headless" CLI for use in automation.tui/CLI that launches a fullscreen TUI built with Ratatui.cli/CLI multitool that provides the aforementioned CLIs via subcommands.