# Definition of Ready

A task is ready for Codex implementation only when:

- The module is described in docs.
- The expected input/output is known.
- The API contract exists or the task explicitly creates it.
- The data model is defined or the task explicitly creates it.
- Acceptance criteria exist.
- Error behavior is defined.
- The task does not require hidden external credentials.

If these conditions are not met, Codex must update the specification before implementing code.