What problem does it solve? After a change merges, the author's own tests have already passed, but nobody has tried to break it. This Skill performs an exploratory quality pass over an already-merged change in constructorfabric/insight, testing the merge description's claims on a stand running that exact build and filing actionable bug reports. ## Core Features & Use Cases - Claim-driven testing: Reads the merge description as testable assertions and drives each one until it breaks, including documented workarounds, stated limits, and end-to-end verification claims. - Five-vector test plan: Executes a plan across Efficiency, Reliability, Performance, Security, and Versatility, probing for silent truncation, combined-limit defects, and client/server contract mismatches. - Disciplined reporting: Files surviving findings through file-bug-insight while filtering out pre-existing platform behavior, environment artifacts, deferred work, and defended design decisions. - Use Case: After a PR adding a capped listing endpoint merges, ask for an exploratory pass on it; the Skill smokes the migration on a pinned-build stand, probes the cap past its limit, and files a report when rows become unreachable. ## Quick Start Run an exploratory quality pass on the change that just merged in PR #142 and file any defects you find.