19f0d196d1
## Why Follow-up to #16106. `argument-comment-lint` already runs as a native Bazel aspect on Linux and macOS, but Windows is still the long pole in `rust-ci`. To move Windows onto the same native Bazel lane, the toolchain split has to let exec-side helper binaries build in an MSVC environment while still linting repo crates as `windows-gnullvm`. Pushing the Windows lane onto the native Bazel path exposed a second round of Windows-only issues in the mixed exec-toolchain plumbing after the initial wrapper/target fixes landed. ## What Changed - keep the Windows lint lanes on the native Bazel/aspect path in `rust-ci.yml` and `rust-ci-full.yml` - add a dedicated `local_windows_msvc` platform for exec-side helper binaries while keeping `local_windows` as the `windows-gnullvm` target platform - patch `rules_rust` so `repository_set(...)` preserves explicit exec-platform constraints for the generated toolchains, keep the Windows-specific bootstrap/direct-link fixes needed for the nightly lint driver, and expose exec-side `rustc-dev` `.rlib`s to the MSVC sysroot - register the custom Windows nightly toolchain set with MSVC exec constraints while still exposing both `x86_64-pc-windows-msvc` and `x86_64-pc-windows-gnullvm` targets - enable `dev_components` on the custom Windows nightly repository set so the MSVC exec helper toolchain actually downloads the compiler-internal crates that `clippy_utils` needs - teach `run-argument-comment-lint-bazel.sh` to enumerate concrete Windows Rust rules, normalize the resulting labels, and skip explicitly requested incompatible targets instead of failing before the lint run starts - patch `rules_rust` build-script env propagation so exec-side `windows-msvc` helper crates drop forwarded MinGW include and linker search paths as whole flag/path pairs instead of emitting malformed `CFLAGS`, `CXXFLAGS`, and `LDFLAGS` - export the Windows VS/MSVC SDK environment in `setup-bazel-ci` and pass the relevant variables through `run-bazel-ci.sh` via `--action_env` / `--host_action_env` so Bazel build scripts can see the MSVC and UCRT headers on native Windows runs - add inline comments to the Windows `setup-bazel-ci` MSVC environment export step so it is easier to audit how `vswhere`, `VsDevCmd.bat`, and the filtered `GITHUB_ENV` export fit together - patch `aws-lc-sys` to skip its standalone `memcmp` probe under Bazel `windows-msvc` build-script environments, which avoids a Windows-native toolchain mismatch that blocked the lint lane before it reached the aspect execution - patch `aws-lc-sys` to prefer its bundled `prebuilt-nasm` objects for Bazel `windows-msvc` build-script runs, which avoids missing `generated-src/win-x86_64/*.asm` runfiles in the exec-side helper toolchain - annotate the Linux test-only callsites in `codex-rs/linux-sandbox` and `codex-rs/core` that the wider native lint coverage surfaced ## Patches This PR introduces a large patch stack because the Windows Bazel lint lane currently depends on behavior that upstream dependencies do not provide out of the box in the mixed `windows-gnullvm` target / `windows-msvc` exec-toolchain setup. - Most of the `rules_rust` patches look like upstream candidates rather than OpenAI-only policy. Preserving explicit exec-platform constraints, forwarding the right MSVC/UCRT environment into exec-side build scripts, exposing exec-side `rustc-dev` artifacts, and keeping the Windows bootstrap/linker behavior coherent all look like fixes to the Bazel/Rust integration layer itself. - The two `aws-lc-sys` patches are more tactical. They special-case Bazel `windows-msvc` build-script environments to avoid a `memcmp` probe mismatch and missing NASM runfiles. Those may be harder to upstream as-is because they rely on Bazel-specific detection instead of a general Cargo/build-script contract. - Short term, carrying these patches in-tree is reasonable because they unblock a real CI lane and are still narrow enough to audit. Long term, the goal should not be to keep growing a permanent local fork of either dependency. - My current expectation is that the `rules_rust` patches are less controversial and should be broken out into focused upstream proposals, while the `aws-lc-sys` patches are more likely to be temporary escape hatches unless that crate wants a more general hook for hermetic build systems. Suggested follow-up plan: 1. Split the `rules_rust` deltas into upstream-sized PRs or issues with minimized repros. 2. Revisit the `aws-lc-sys` patches during the next dependency bump and see whether they can be replaced by an upstream fix, a crate upgrade, or a cleaner opt-in mechanism. 3. Treat each dependency update as a chance to delete patches one by one so the local patch set only contains still-needed deltas. ## Verification - `./.github/scripts/run-argument-comment-lint-bazel.sh --config=argument-comment-lint --keep_going` - `RUNNER_OS=Windows ./.github/scripts/run-argument-comment-lint-bazel.sh --nobuild --config=argument-comment-lint --platforms=//:local_windows --keep_going` - `cargo test -p codex-linux-sandbox` - `cargo test -p codex-core shell_snapshot_tests` - `just argument-comment-lint` ## References - #16106
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:
npm i -g @openai/codex
codex
You can also install via Homebrew (brew install --cask codex) or download a platform-specific release directly from our GitHub Releases.
Documentation quickstart
- First run with Codex? Start with
docs/getting-started.md(links to the walkthrough for prompts, keyboard shortcuts, and session management). - Want deeper control? See
docs/config.mdanddocs/install.md.
What's new in the Rust CLI
The Rust implementation is now the maintained Codex CLI and serves as the default experience. It includes a number of features that the legacy TypeScript CLI never supported.
Config
Codex supports a rich set of configuration options. Note that the Rust CLI uses config.toml instead of config.json. See docs/config.md for details.
Model Context Protocol Support
MCP client
Codex CLI functions as an MCP client that allows the Codex CLI and IDE extension to connect to MCP servers on startup. See the configuration documentation for details.
MCP server (experimental)
Codex can be launched as an MCP server by running codex mcp-server. This allows other MCP clients to use Codex as a tool for another agent.
Use the @modelcontextprotocol/inspector to try it out:
npx @modelcontextprotocol/inspector codex mcp-server
Use codex mcp to add/list/get/remove MCP server launchers defined in config.toml, and codex mcp-server to run the MCP server directly.
Notifications
You can enable notifications by configuring a script that is run whenever the agent finishes a turn. The notify documentation includes a detailed example that explains how to get desktop notifications via terminal-notifier on macOS. When Codex detects that it is running under WSL 2 inside Windows Terminal (WT_SESSION is set), the TUI automatically falls back to native Windows toast notifications so approval prompts and completed turns surface even though Windows Terminal does not implement OSC 9.
codex exec to run Codex programmatically/non-interactively
To run Codex non-interactively, run codex exec PROMPT (you can also pass the prompt via stdin) and Codex will work on your task until it decides that it is done and exits. If you provide both a prompt argument and piped stdin, Codex appends stdin as a <stdin> block after the prompt so patterns like echo "my output" | codex exec "Summarize this concisely" work naturally. Output is printed to the terminal directly. You can set the RUST_LOG environment variable to see more about what's going on.
Use codex exec --ephemeral ... to run without persisting session rollout files to disk.
Experimenting with the Codex Sandbox
To test to see what happens when a command is run under the sandbox provided by Codex, we provide the following subcommands in Codex CLI:
# macOS
codex sandbox macos [--full-auto] [--log-denials] [COMMAND]...
# Linux
codex sandbox linux [--full-auto] [COMMAND]...
# Windows
codex sandbox windows [--full-auto] [COMMAND]...
# Legacy aliases
codex debug seatbelt [--full-auto] [--log-denials] [COMMAND]...
codex debug landlock [--full-auto] [COMMAND]...
Selecting a sandbox policy via --sandbox
The Rust CLI exposes a dedicated --sandbox (-s) flag that lets you pick the sandbox policy without having to reach for the generic -c/--config option:
# Run Codex with the default, read-only sandbox
codex --sandbox read-only
# Allow the agent to write within the current workspace while still blocking network access
codex --sandbox workspace-write
# Danger! Disable sandboxing entirely (only do this if you are already running in a container or other isolated env)
codex --sandbox danger-full-access
The same setting can be persisted in ~/.codex/config.toml via the top-level sandbox_mode = "MODE" key, e.g. sandbox_mode = "workspace-write".
In workspace-write, Codex also includes ~/.codex/memories in its writable roots so memory maintenance does not require an extra approval.
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.
If you want to contribute or inspect behavior in detail, start by reading the module-level README.md files under each crate and run the project workspace from the top-level codex-rs directory so shared config, features, and build scripts stay aligned.