A little help for Codex.

Find actionable regressions without a wall of nitpicks.

Build a hypothesis from the evidence you actually have.

Get from file names to a useful mental model.

Test observable behaviour, including the awkward cases.

Change the structure while preserving the contract.

Spot confusing contracts before they become integrations.

Help someone go from clone to first success.

Surface data-loss and rollback risks early.

Replace ambiguity with an observable failing case.

Find data-loss and rollout risks early.

Make failures predictable for clients.

Turn query plans into testable improvements.

Spot breaking changes before they reach users.

Check retries, idempotency, and partial failures.

Explain setup, contracts, and recovery paths.

Cover the user journeys most likely to break.

Make the failure small enough to understand.