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mattpocock/diagnose

難しいバグやパフォーマンスの後退を診断するための規律あるループを提供します。再現→最小化→仮説→計測→修正→回帰テストのサイクルで、ユーザーが「診断して」「デバッグして」などと言った際に使用します。

diagnose とは?

このスキルは、AIエージェント(Claude Code、Cursor、Codexなど)が難しいバグやパフォーマンスの後退を体系的に診断・修正するための規律あるワークフローを提供します。Reproduce(再現)→Minimise(最小化)→Hypothesise(仮説)→Instrument(計測)→Fix(修正)→Regression-test(回帰テスト)の6ステップで構成され、エージェントが「このバグを診断して」や「デバッグして」といった指示、あるいは「壊れている」「例外をスローしている」「失敗している」「パフォーマンスが低下している」といった報告を受けた際に自動的に起動します。このスキルは、エージェントがバグやパフォーマンス問題に遭遇したときに、行き当たりばったりの修正ではなく、系統立った診断プロセスを強制することで、根本原因の特定と信頼性の高い修正を実現します。AIエージェント向けに設計されており、Claude Code、Coder、Codexなどの主要なエージェントプラットフォームでそのまま利用可能です。

対応~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/mattpocock/skills/tree/main/skills/diagnose

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ドキュメント

diagnose は何をしますか?

難しいバグやパフォーマンスの後退を診断するための規律あるループです。再現 → 最小化 → 仮説 → 計測 → 修正 → 回帰テスト。ユーザーが「これを診断して」/「これをデバッグして」と言った場合、バグを報告した場合、何かが壊れている・例外をスローしている・失敗していると言った場合、またはパフォーマンスの後退を説明した場合に使用します。

Individual skills in this repo

This repo contains 20 individual skills — each has its own dedicated page.

mattpocock/ask-matt

Ask which skill or flow fits your situation. A router over the skills in this repo.

mattpocock/caveman

Ultra-compressed communication mode. Cuts token usage ~75% by dropping filler, articles, and pleasantries while keeping full technical accuracy. Use when user says "caveman mode", "talk like caveman", "use caveman", "less tokens", "be brief", or invokes /caveman.

mattpocock/claude-handoff

Hand the current conversation off to a fresh background agent that picks up the work immediately.

mattpocock/codebase-design

Shared vocabulary for designing deep modules. Use when the user wants to design or improve a module's interface, find deepening opportunities, decide where a seam goes, make code more testable or AI-navigable, or when another skill needs the deep-module vocabulary.

mattpocock/design-an-interface

Generate multiple radically different interface designs for a module using parallel sub-agents. Use when user wants to design an API, explore interface options, compare module shapes, or mentions "design it twice".

mattpocock/diagnosing-bugs

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

mattpocock/domain-modeling

Build and sharpen a project's domain model. Use when the user wants to pin down domain terminology or a ubiquitous language, record an architectural decision, or when another skill needs to maintain the domain model.

mattpocock/edit-article

Edit and improve articles by restructuring sections, improving clarity, and tightening prose. Use when user wants to edit, revise, or improve an article draft.

mattpocock/git-guardrails-claude-code

Set up Claude Code hooks to block dangerous git commands (push, reset --hard, clean, branch -D, etc.) before they execute. Use when user wants to prevent destructive git operations, add git safety hooks, or block git push/reset in Claude Code.

mattpocock/grilling

Grill the user relentlessly about a plan or design. Use when the user wants to stress-test a plan before building, or uses any 'grill' trigger phrases.

mattpocock/grill-me

Interview the user relentlessly about a plan or design until reaching shared understanding, resolving each branch of the decision tree. Use when user wants to stress-test a plan, get grilled on their design, or mentions "grill me".

mattpocock/grill-with-docs

Grilling session that challenges your plan against the existing domain model, sharpens terminology, and updates documentation (CONTEXT.md, ADRs) inline as decisions crystallise. Use when user wants to stress-test a plan against their project's language and documented decisions.

mattpocock/handoff

Compact the current conversation into a handoff document for another agent to pick up.

mattpocock/implement

Implement a piece of work based on a PRD or set of issues.

mattpocock/implement-spec

Implement a specification in code.

mattpocock/improve-codebase-architecture

Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.

mattpocock/loop-me

Grill me about specs for the workflows I want to build, within this workspace.

mattpocock/migrate-to-shoehorn

Migrate test files from `as` type assertions to @total-typescript/shoehorn. Use when user mentions shoehorn, wants to replace `as` in tests, or needs partial test data.

mattpocock/obsidian-vault

Search, create, and manage notes in the Obsidian vault with wikilinks and index notes. Use when user wants to find, create, or organize notes in Obsidian.

mattpocock/prototype

Build a throwaway prototype to flesh out a design — a runnable terminal app for state/business-logic questions, or several radically different UI variations toggleable from one route.

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