A green build does not show that saving works. This skill guides your coding agent to connect your acceptance criteria to unit, browser and manual evidence, so you know what was actually checked before you share the app.
Checks are chosen by the failure they must detect: unit checks for a validation rule, integration checks for a write followed by a fresh read, browser checks for the real journey through the interface, and manual checks for wording, keyboard access and layout. The agent covers persisted create and read, invalid input and failed writes, plus edit and delete where they exist, with isolated data and accessible selectors.
The regression check has to fail against the broken behavior and pass after the repair, so you know it can catch the defect. Manual checks and checks blocked by a missing service are reported separately, not silently turned into skips. It reuses your project's existing test runner.
You need a coding agent with access to your project files. Provider accounts, model weights, GPU compute and hosting are not included.