# External (non-OpenAI) Pull Request Requirements Before opening this Pull Request, please read the dedicated "Contributing" markdown file or your PR may be closed: https://github.com/openai/codex/blob/main/docs/contributing.md If your PR conforms to our contribution guidelines, replace this text with a detailed and high quality description of your changes.
codex-core
This crate implements the business logic for Codex. It is designed to be used by the various Codex UIs written in Rust.
Dependencies
Note that codex-core makes some assumptions about certain helper utilities being available in the environment. Currently, this
macOS
Expects /usr/bin/sandbox-exec to be present.
Linux
Expects the binary containing codex-core to run the equivalent of codex debug landlock when arg0 is codex-linux-sandbox. See the codex-arg0 crate for details.
All Platforms
Expects the binary containing codex-core to simulate the virtual apply_patch CLI when arg1 is --codex-run-as-apply-patch. See the codex-arg0 crate for details.