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diagnose by @mattpocock
Disciplined diagnosis loop for hard bugs and performance regressions.
Disciplined diagnosis loop for hard bugs and performance regressions. Reproduce → minimise → hypothesise → instrument → fix → regression-test. Use when user says "diagnose this" / "debug this", reports a bug, says something is broken/throwing/failing, or describes a performance regression.
What it can do
Failing test at whatever seam reaches the bug — unit, integration, e2e.
CLI invocation with a fixture input, diffing stdout against a known-good snapshot.
Throwaway harness. Spin up a minimal subset of the system (one service, mocked deps) that exercises the bug code path with a single function call.
SKILL.md
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