Debug test failures through a four-phase root-cause investigation workflow.
npx skills add https://github.com/btseytlin/ultrapack --skill udebug
Please help me install this Agent Skill. Skill: udebug Source: https://github.com/btseytlin/ultrapack/tree/main/plugins/up/skills/udebug Command: npx skills add https://github.com/btseytlin/ultrapack --skill udebug
udebug helps you systematically diagnose a bug or test failure so you fix the underlying root cause instead of applying symptom patches that tend to reappear.
Use udebug when a bug or test failure occurs—provide the error output and reproduction steps, then ask the skill to run the four investigation phases before proposing any fix.
High-intent search queries and answers about installing and using this skill.
Root-cause analysis is a systematic debugging workflow that reproduces and traces failures, pattern-matches against working examples, tests a single hypothesis minimally, and implements a bounded fix. It prevents symptom patches from reappearing by enforcing investigation before any fix.
Debug flaky tests by using condition-based waiting instead of sleep-based timing guesses. Document the investigation thoroughly before settling on environmental causes, ensuring non-determinism is traced to a root cause rather than masked with arbitrary delays.
Stop symptom patching by enforcing a no-fix-without-investigation rule during debugging. Reproduce the failure, pattern-match against working examples, test a single minimal hypothesis, and stop after three failed fix attempts to prevent whack-a-mole debugging.
The best way to reproduce and trace unexpected behavior is a four-phase root-cause workflow: reproduce and trace data, pattern-match against working examples, test one hypothesis minimally, then implement and verify a single fix with bounded retries and anti-whack-a-mole pattern checks.
Avoid applying fixes during root-cause analysis until the failure is reproduced, traced, and pattern-matched. Stop after three failed fix attempts, and never close the investigation without identifying the underlying pattern that caused the bug.
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