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## Why #23813 switches the Windows sandbox runner path to `PermissionProfile`, but it still left one runtime anchor for resolving symbolic `:workspace_roots` entries. That is not enough once a turn has multiple effective workspace roots: exact entries and deny globs under `:workspace_roots` need to be materialized for every runtime root before the command runner chooses token mode or builds ACL plans. ## What Changed - Replaces the Windows runner/setup `permission_profile_cwd` plumbing with `workspace_roots: Vec<AbsolutePathBuf>`. - Resolves Windows-local `PermissionProfile` data with `materialize_project_roots_with_workspace_roots(...)` instead of the single-cwd helper. - Threads `Config::effective_workspace_roots()` through core execution, unified exec, TUI setup/read-grant flows, app-server setup, app-server `command/exec`, and `debug sandbox` on Windows. - Preserves those workspace roots through the zsh-fork escalation executor instead of rebuilding them from `sandbox_policy_cwd`. - Makes `ExecRequest::new(...)` and the remaining `build_exec_request(...)` helper path take `windows_sandbox_workspace_roots` explicitly so new call sites cannot silently fall back to `vec![cwd]`. - Clarifies the `debug sandbox` non-Windows comment: remaining cwd-dependent resolution still uses `sandbox_policy_cwd`, while `:workspace_roots` entries are already materialized from config roots. - Updates elevated runner IPC `SpawnRequest` to send `workspace_roots` and bumps the framed IPC protocol version to `3` for the payload shape change. - Adds Windows-local resolver coverage for expanding exact and glob `:workspace_roots` entries across multiple roots, plus core helper coverage proving explicit roots are preserved. ## Verification - `cargo check -p codex-windows-sandbox -p codex-core -p codex-tui -p codex-cli -p codex-app-server` - `cargo test -p codex-windows-sandbox` - `cargo test -p codex-core windows_sandbox` - `cargo test -p codex-core unix_escalation` - `cargo test -p codex-app-server windows_sandbox` - `cargo test -p codex-tui windows_sandbox` - `cargo test -p codex-cli debug_sandbox` - `just test -p codex-core unified_exec` - `just test -p codex-core build_exec_request_preserves_windows_workspace_roots` - `env -u CODEX_NETWORK_PROXY_ACTIVE -u CODEX_NETWORK_ALLOW_LOCAL_BINDING just test -p codex-app-server --lib command_exec` - `just test -p codex-windows-sandbox` - `just test -p codex-exec sandbox` - `just fix -p codex-core -p codex-app-server -p codex-windows-sandbox` A local macOS cross-check with `cargo check --target x86_64-pc-windows-msvc ...` did not reach crate Rust code because native dependencies require Windows SDK headers (`windows.h` / `assert.h`) in this environment; Windows CI remains the real target validation. Two local targeted filters compile but do not run assertions on macOS: `env -u CODEX_NETWORK_PROXY_ACTIVE -u CODEX_NETWORK_ALLOW_LOCAL_BINDING just test -p codex-app-server --lib command_exec_processor` matched zero tests, and `just test -p codex-linux-sandbox landlock` matched zero tests because the landlock suite is Linux-only.
Codex CLI (Rust Implementation)
We provide Codex CLI as a standalone 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, use the sandbox subcommand in Codex CLI:
# Uses the sandbox implementation for the current host OS:
# Seatbelt on macOS, the Linux sandbox on Linux, and Windows restricted token on Windows.
codex sandbox [COMMAND]...
# macOS-only diagnostic option
codex sandbox --log-denials [COMMAND]...
codex sandbox also accepts --profile NAME (-p NAME) to layer
$CODEX_HOME/NAME.config.toml onto the base user config for the sandboxed
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
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 becomes 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.