Claude skills for Engineering

4 skills in the bank are filed under Engineering. They are grouped here because they compete for the same jobs — which is the reason an agent reaching for one of them sometimes gets another.

• HealthgstackProduces a standing dashboard of a codebase's overall quality — complexity, coverage, duplication, hot spots — to show where the whole project is trending. It measures the codebase in aggregate over time, not a single plan, a single diff, or a single bug.
• InvestigategstackChases a bug or failure to its actual root cause through systematic evidence-gathering, rather than patching the first symptom. It is the diagnose-why-this-breaks step, distinct from reviewing a plan, reviewing a diff, or reporting overall code-quality metrics.
• Plan Eng ReviewgstackReviews a proposed technical plan the way an engineering manager would — is the architecture sound, are the tradeoffs right, what will bite later — before any code is written. It judges the approach on paper, unlike a pre-merge review that reads a finished diff or a debugger that chases a live bug.
• ReviewgstackReads a finished code change just before it lands and flags what should block the merge — correctness, risk, missed cases — on the actual diff. It reviews written code at merge time, not an architecture plan before building and not a running failure.