Improve an existing project's development feedback, setup reproducibility, and agent observability. Use when adopting a development harness or assessing gaps in its build, test, runtime, and visual workflows.
Implement or debug a product change through the project's existing build, runtime inspection, and verification loop. Use when the task needs evidence of behavior beyond successful compilation.
Verify UI changes with deterministic fixtures, previews, snapshots, and real interaction captures. Use when an agent needs to inspect rendered content, compare before/current/difference images, or diagnose misleading visual evidence.