What problem does it solve? Hard bugs and performance regressions resist casual code reading; without a reproducible signal, debugging devolves into guessing. This Skill enforces a disciplined diagnosis loop that builds a tight pass/fail feedback signal first, then reproduces, minimizes, hypothesizes, instruments, fixes, and cleans up. ## Core Features & Use Cases - Feedback Loop Construction: Builds a red-capable, deterministic, fast repro command using failing tests, curl scripts, headless browser runs, trace replays, fuzz loops, or bisection harnesses. - Structured Hypothesis Testing: Generates 3-5 ranked falsifiable hypotheses, then instruments with tagged debug logs or profilers, changing one variable at a time. - Regression Lockdown: Writes a regression test at a correct seam before the fix, verifies the original repro, and removes all debug instrumentation during cleanup. - Use Case: A user reports an intermittent export failure in production. The Skill drives creation of a replay harness from a captured request, minimizes the failing scenario, tests ranked hypotheses, and lands a fix with a regression test. ## Quick Start Ask the agent to diagnose the bug where the export button throws an error, and have it build a reproduction loop before proposing any fix.
