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## Why After the split-policy plumbing landed, additional-permissions widening still rebuilt filesystem access through the legacy projection in a few places. That can erase explicit deny entries and make the runtime treat a policy as fully writable even when it still has blocked subpaths, which in turn can skip the platform sandbox when it is still needed. ## What changed - preserved explicit deny entries when merging additional read and write permissions into `FileSystemSandboxPolicy` - switched platform-sandbox selection to rely on `FileSystemSandboxPolicy::has_full_disk_write_access()` instead of ad hoc root-write checks - kept the widened policy path in `core/src/exec.rs` and `core/src/sandboxing/mod.rs` aligned so denied subpaths survive both policy merging and sandbox selection - added regression coverage for root-write policies that still carry carveouts ## Verification - added regression coverage in `core/src/sandboxing/mod.rs` showing that root write plus carveouts still requires the platform sandbox - verified the current PR state with `just clippy` --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/13451). * #13453 * #13452 * __->__ #13451 * #13449 * #13448 * #13445 * #13440 * #13439 --------- Co-authored-by: viyatb-oai <viyatb@openai.com>
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 want the desktop app experience, run
codex app or visit the Codex App page.
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:
# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex
Then simply run codex to get started.
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.
Docs
This repository is licensed under the Apache-2.0 License.