Individual skill
bug-diagnosis
Diagnose a bug systematically instead of guessing — reproduce, isolate, form hypotheses, and test them to root cause. Use when debugging, chasing a defect, an intermittent failure, or 'why is this happening?'. Produces a structured diagnosis: a reliable repro, the narrowed-down location, ranked hypotheses with how to test each, and the root cause + fix once found.
plugins/pm-craft/skills/bug-diagnosis/SKILL.md
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- Last checked
- Nov 9, 2026
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- Nov 10, 2026
- License
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SKILL.mdcore · 3,254 bytes
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# Bug Diagnosis Skill
The slowest way to fix a bug is to start changing code and hope. This skill runs a disciplined diagnostic
loop: **reproduce it reliably, isolate where it happens, hypothesize why, and test the cheapest hypothesis
first** — narrowing until the root cause is proven, not guessed. It produces a fix *and* an explanation of why
the bug existed.
## Required Inputs
Ask for these only if they aren't already provided:
- **The symptom** — what's wrong: expected vs. actual behavior, error/stack trace, when it started.
- **Repro steps** — how to trigger it (or "can't reliably reproduce yet").
- **Context** — recent changes, environment, frequency (always / intermittent / specific inputs).