codex/AGENTS.md

Rust/codex-rs

In the codex-rs folder where the rust code lives:

• Never add or modify any code related to CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR or CODEX_SANDBOX_ENV_VAR.
  • You operate in a sandbox where CODEX_SANDBOX_NETWORK_DISABLED=1 will be set whenever you use the shell tool. Any existing code that uses CODEX_SANDBOX_NETWORK_DISABLED_ENV_VAR was authored with this fact in mind. It is often used to early exit out of tests that the author knew you would not be able to run given your sandbox limitations.
  • Similarly, when you spawn a process using Seatbelt (/usr/bin/sandbox-exec), CODEX_SANDBOX=seatbelt will be set on the child process. Integration tests that want to run Seatbelt themselves cannot be run under Seatbelt, so checks for CODEX_SANDBOX=seatbelt are also often used to early exit out of tests, as appropriate.

Before creating a pull request with changes to codex-rs, run just fmt (in codex-rs directory) to format the code and just fix (in codex-rs directory) to fix any linter issues in the code, ensure the test suite passes by running cargo test --all-features in the codex-rs directory.

When making individual changes prefer running tests on individual files or projects first.