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Diagnosing bugs skill

Diagnosing bugs is part of Matt Pocock's engineering skills. Its job is to work hard bugs in phases: build a feedback loop, reproduce, hypothesize, instrument, fix. It loads on its own when a request matches its description, and you can also call it by name. It bundles shell scripts that the instructions call for.

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When the agent reaches for it

The agent keeps every installed skill's description in view and loads the full instructions when a request matches. This is the description it reads:

Diagnosis loop for hard bugs and performance regressions. Use when the user says "diagnose"/"debug this", or reports something broken/throwing/failing/slow.

What the instructions cover

The sections of its SKILL.md, in order.

  • Redact
  • Phase 1: Build a feedback loop
  • Phase 2: Reproduce + minimise
  • Phase 3: Hypothesise
  • Phase 4: Instrument
  • Phase 5: Fix + regression test
  • Phase 6: Cleanup

What ships with it

Besides SKILL.md, the folder carries these. The agent opens them only when a step in the instructions calls for one.

  • agents/ 1 file · 103 B
  • scripts/ 1 file · 1 KB

Install the diagnosing bugs skill

In Claude Code, run this in a session. It comes from the publisher's own instructions.

Claude Code 
/plugin install mattpocock-skills

License: MIT.

In Longwave, add Engineering Skills from the marketplace. It installs all 37 of its skills, and your Claude Code, Codex and OpenCode threads can use them.

Questions people ask

How do I install the diagnosing bugs skill?

In Claude Code, run /plugin install mattpocock-skills. In Longwave, add Engineering Skills from the marketplace, and its skills reach your Claude Code, Codex and OpenCode threads.

When does the agent use the diagnosing bugs skill?

When a request matches its description. The agent keeps only the name and description of each installed skill in view, and reads the full instructions when a task fits. You can also ask for it by name.

Use your skills in every harness.

Longwave installs a skill collection once, and your Claude Code, Codex and OpenCode threads can all use it.

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