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## Why `SandboxPolicy` currently mixes together three separate concerns: - parsing layered config from `config.toml` - representing filesystem sandbox state - carrying basic network policy alongside filesystem choices That makes the existing config awkward to extend and blocks the new TOML proposal where `[permissions]` becomes a table of named permission profiles selected by `default_permissions`. (The idea is that if `default_permissions` is not specified, we assume the user is opting into the "traditional" way to configure the sandbox.) This PR adds the config-side plumbing for those profiles while still projecting back to the legacy `SandboxPolicy` shape that the current macOS and Linux sandbox backends consume. It also tightens the filesystem profile model so scoped entries only exist for `:project_roots`, and so nested keys must stay within a project root instead of using `.` or `..` traversal. This drops support for the short-lived `[permissions.network]` in `config.toml` because now that would be interpreted as a profile named `network` within `[permissions]`. ## What Changed - added `PermissionsToml`, `PermissionProfileToml`, `FilesystemPermissionsToml`, and `FilesystemPermissionToml` so config can parse named profiles under `[permissions.<profile>.filesystem]` - added top-level `default_permissions` selection, validation for missing or unknown profiles, and compilation from a named profile into split `FileSystemSandboxPolicy` and `NetworkSandboxPolicy` values - taught config loading to choose between the legacy `sandbox_mode` path and the profile-based path without breaking legacy users - introduced `codex-protocol::permissions` for the split filesystem and network sandbox types, and stored those alongside the legacy projected `sandbox_policy` in runtime `Permissions` - modeled `FileSystemSpecialPath` so only `ProjectRoots` can carry a nested `subpath`, matching the intended config syntax instead of allowing invalid states for other special paths - restricted scoped filesystem maps to `:project_roots`, with validation that nested entries are non-empty descendant paths and cannot use `.` or `..` to escape the project root - kept existing runtime consumers working by projecting `FileSystemSandboxPolicy` back into `SandboxPolicy`, with an explicit error for profiles that request writes outside the workspace root - loaded proxy settings from top-level `[network]` - regenerated `core/config.schema.json` ## Verification - added config coverage for profile deserialization, `default_permissions` selection, top-level `[network]` loading, network enablement, rejection of writes outside the workspace root, rejection of nested entries for non-`:project_roots` special paths, and rejection of parent-directory traversal in `:project_roots` maps - added protocol coverage for the legacy bridge rejecting non-workspace writes ## Docs - update the Codex config docs on developers.openai.com/codex to document named `[permissions.<profile>]` entries, `default_permissions`, scoped `:project_roots` syntax, the descendant-path restriction for nested `:project_roots` entries, and top-level `[network]` proxy configuration --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/13434). * #13453 * #13452 * #13451 * #13449 * #13448 * #13445 * #13440 * #13439 * __->__ #13434
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. 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.