Tools

Tools let Codex inspect real systems, change files, run checks, search authoritative sources, and connect to services. The best tool is the smallest one that proves the next fact.

Core toolbox

Files and terminal

Read the project before editing it. Search narrowly, preserve unrelated work, and validate changes with the project’s own commands.

Browser and documentation

Use current, primary documentation when versions or behavior may have changed. A source should support the exact claim being made.

Connectors

Connectors bring external systems—code hosts, storage, calendars, and business tools—into a controlled workflow. Grant only the permissions the task needs.

A safety rule

Never place secrets in source code. Use environment variables or a managed secrets service, and prefer short-lived credentials for deployment access.