What is diagnosing-bugs?
diagnosing-bugs is a Claude skill by mattpocock that diagnosis loop for hard bugs and performance regressions. Use when the user says "diagnose"/"debug this", or reports something broken/throwing/failing/slow. It is listed under Engineering practice and has 746,500 installs.
| Type | Claude skill |
|---|---|
| Author | mattpocock |
| Repository | mattpocock/skills |
| Popularity | 746,500 installs |
| Category | Engineering practice |
| Security | Low risk (96/100) |
| Rank | #22 of 1,262 Claude skills; #4 in Engineering practice |
| SKILL.md length | 138 lines |
| License | MIT |
| Last commit | 2026-10-13 |
| Stars this week | +9,154 |
Is diagnosing-bugs safe to install?
diagnosing-bugs scores 96/100 on the MCPMods security check: Low risk. No checks raised a concern. It passed 8 of 9 checks.
Skill results come from a static scan of its SKILL.md for instruction overrides, hidden actions, risky commands and credential access.
| Check | Result |
|---|---|
| No instruction-override phrases | Pass |
| No hidden actions | Pass |
| No pipe-to-shell installers | Pass |
| No obfuscated code | Pass |
| No destructive commands | Pass |
| Doesn't ask for keys or credentials | Pass |
| Makes network requests | Note |
| No shell commands | Pass |
| Installs no packages | Pass |
What the scan matched
- network:
Curl - scripts:
scripts/hitl-loop.template.sh
How do I install diagnosing-bugs?
- Install with the skills CLI. Works for Claude Code and other agents that read skills.
npx skills add https://github.com/mattpocock/skills --skill diagnosing-bugs
- Or copy it by hand. Claude Code loads any folder with a SKILL.md from ~/.claude/skills.
git clone https://github.com/mattpocock/skills cp -r skills/skills/engineering/diagnosing-bugs ~/.claude/skills/diagnosing-bugs
- Use it. Claude loads the skill when a task matches its description. You can also name it in your prompt.
Use the diagnosing-bugs skill to …
Or ask Claude to set it up
Paste this into Claude Code and it installs diagnosing-bugs for you:
Install the "diagnosing-bugs" skill from https://github.com/mattpocock/skills/tree/main/skills/engineering/diagnosing-bugs into ~/.claude/skills, then tell me in one line what it does.
More from mattpocock/skills
This repository has at least 9 Claude skills on MCPMods.
- grill-me: A relentless interview to sharpen a plan or design. (Low risk)
- grill-with-docs: A relentless interview to sharpen a plan or design, which also creates docs (ADR's and glossary) as we go. (Low risk)
- improve-codebase-architecture: Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you (Low risk)
- tdd: Test-driven development. Use when the user wants to build features or fix bugs test-first, mentions "red-green-refactor" (Low risk)
- setup-matt-pocock-skills: Configure this repo for the engineering skills: set up its issue tracker, triage label vocabulary, and domain doc layout (Low risk)
- handoff: Compact the current conversation into a handoff document for another agent to pick up. (Low risk)
- triage: Move issues and external PRs through a state machine of triage roles, categorise, verify, grill if needed, and write age (Low risk)
- prototype: Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model o (Low risk)