What problem does it solve? Hard bugs and performance regressions resist casual debugging: staring at code rarely finds the cause. This Skill enforces a disciplined six-phase diagnosis loop that builds a tight, red-capable feedback signal first, then reproduces, minimizes, hypothesizes, instruments, fixes, and cleans up. ## Core Features & Use Cases - Feedback Loop Construction: Builds a deterministic pass/fail signal via failing tests, curl scripts, CLI fixtures, headless browser scripts, trace replay, fuzz loops, bisection harnesses, or differential runs. - Structured Hypothesis Testing: Generates 3-5 ranked, falsifiable hypotheses and instruments one variable at a time with tagged debug logs for easy cleanup. - Regression Lockdown: Converts the minimized repro into a regression test at a correct seam, or flags missing seams as an architecture finding. - Use Case: A user reports an intermittent export failure. The Skill drives a headless browser loop to reproduce it at a high rate, narrows the cause through ranked hypotheses, and lands a fix with a regression test. ## Quick Start Ask the agent to diagnose the failing export button by building a reproduction loop and following the diagnosis phases.
