Nine complementary skills for auditing, measuring, and maintaining Claude Code ecosystem health and project test quality. Audit → measure (Claude stack + project tests) → clean → stay consistent: identify HOT vs DORMANT artifacts, measure whether the HOT ones actually improve outcomes, measure whether your project's…
Counterfactual A/B + layered-ablation harness for Claude Code setup. Measures whether your /.claude/ stack (skills, lessons, axioms, memory) plus in-repo discipline (docs/runbooks, decisions, findings) actually helps on real tasks. Binary A/B (setup-ON vs setup-OFF) and layered ablation (strip one layer at a time, ran.
A check reported clean without examining the case it exists for — "green" meant "nothing ran". Use when about to trust a gate, test or CI step you have never watched fail; when a guard is green but the bug it guards shipped anyway; when a check passes on a shallow clone, a disabled object, a malformed input or an…