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bugfix

Reproduce software bugs, isolate root causes, and verify minimal fixes with tests.

8|1|Updated Jul 2, 2026
Search Tags:#software engineering#debugging#root cause analysis#regression#bugfix#reproduction#failing test
One-click install
npx skills add https://github.com/duthaho/skillhub --skill bugfix-duthaho
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: bugfix
Source: https://github.com/duthaho/skillhub/tree/main/.claude/skills/bugfix
Command: npx skills add https://github.com/duthaho/skillhub --skill bugfix-duthaho

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps you resolve bugs with a disciplined, evidence-first workflow so you do not guess at fixes or hide the real cause behind a quick patch.

Core Features & Use Cases

  • Deterministic reproduction: Requires a failing command, test, or repro path before any code changes.
  • Root-cause analysis: Demands ranked, falsifiable hypotheses and evidence before selecting a fix.
  • Test-first repair: Adds a failing test that captures the bug, then applies the minimal fix and verifies the original repro again.
  • Bug memory: Maintains a bug-fix log so recurring issues are recognized faster.
  • Use case: A login endpoint returns 500 on empty input, a test is flaky, or a recent change introduced a crash and you need the smallest provable repair.

Quick Start

Use the bugfix skill to reproduce the reported failure, identify the root cause, write a failing test, and apply the minimal fix.

Frequently Asked Questions about bugfix

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I debug a flaky test to find the root cause?▼

Debug a flaky test by first reproducing the failure deterministically, then generating ranked falsifiable hypotheses to isolate the root cause with evidence before applying a fix.

What is the best way to fix a regression without guessing at patches?▼

Fixing a regression without guessing requires an evidence-first workflow: reproduce the reported failure, analyze ranked hypotheses for root cause evidence, write a failing test, and apply the minimal repair.

How do I reproduce a software crash that only happens intermittently?▼

Reproduce an intermittent software crash by identifying a deterministic repro path or failing command, which is required before any code changes are attempted to isolate the failure.

Why should I write a failing test before applying a bugfix?▼

Writing a failing test before a bugfix captures the exact defect, ensuring the applied minimal fix is verifiable and provable when you rerun the original reproduction and the new test.

Can I use this debugging workflow for a login endpoint returning a 500 error on empty input?▼

Yes, this debugging workflow applies to a login endpoint returning 500 on empty input by reproducing the failure, analyzing root cause evidence, writing a failing test, and applying the minimal provable repair.

Does root cause analysis work when I do not have a deterministic repro path?▼

Root cause analysis requires a deterministic reproduction, such as a failing command or test path, before any code changes are attempted, ensuring the bug is isolated and the fix is verifiable.

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