Agent skill

debug

Guide structured debugging before code changes by clarifying expected behavior, reproducing issues, identifying likely root causes, and agreeing on a fix plan with validation steps. Use when users ask to debug bugs, investigate regressions, triage incidents, diagnose failing behavior, handle failing tests, analyze production incidents, investigate error spikes, or run root cause analysis (RCA).

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Install this agent skill to your Project

npx add-skill https://github.com/codeaholicguy/ai-devkit/tree/main/skills/debug

SKILL.md

Local Debugging Assistant

Debug with an evidence-first workflow before changing code.

Hard Rule

  • Do not modify code until the user approves a selected fix plan.

Workflow

  1. Clarify
  • Restate observed vs expected behavior in one concise diff.
  • Confirm scope and measurable success criteria.
  • Before investigating, search for similar past incidents: npx ai-devkit@latest memory search --query "<observed behavior>" --tags "debug,root-cause"
  1. Reproduce
  • Capture minimal reproduction steps.
  • Capture environment fingerprint: runtime, versions, config flags, data sample, and platform.
  1. Hypothesize and Test For each hypothesis, include:
  • Predicted evidence if true.
  • Disconfirming evidence if false.
  • Exact test command or check.
  • Prefer one-variable-at-a-time tests.
  1. Plan
  • Present fix options with risks and verification steps.
  • Recommend one option and request approval.

Validation

  • Confirm a pre-fix failing signal exists.
  • Confirm post-fix success using the verify skill — including regression verification for bug fixes.
  • Summarize remaining risks and follow-ups.
  • Store root cause and fix for future sessions: npx ai-devkit@latest memory store --title "<root cause>" --content "<diagnosis and fix>" --tags "debug,root-cause"

Red Flags and Rationalizations

Rationalization Why It's Wrong Do Instead
"I already know the cause" Assumptions skip evidence Reproduce and prove it first
"This is urgent, just fix it" A wrong fix wastes more time 10 minutes of diagnosis saves hours
"The fix is obvious from the stack trace" Stack traces show symptoms, not causes Trace backward to the root cause

Output Template

Use this response structure:

  • Observed vs Expected
  • Repro and Environment
  • Hypotheses and Tests
  • Options and Recommendation
  • Validation Plan and Results
  • Open Questions

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codeaholicguy/ai-devkit

simplify-implementation

Analyze and simplify existing implementations to reduce complexity, improve maintainability, and enhance scalability. Use when users ask to simplify code, reduce complexity, refactor for readability, clean up implementations, improve maintainability, reduce technical debt, or make code easier to understand.

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dev-lifecycle

Structured SDLC workflow with 8 phases — requirements, design review, planning, implementation, testing, and code review. Use when the user wants to build a feature end-to-end, or run any individual phase (new requirement, review requirements, review design, execute plan, update planning, check implementation, write tests, code review).

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tdd

Test-driven development — write a failing test before writing production code. Use when implementing new functionality, adding behavior, or fixing bugs during active development.

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codeaholicguy/ai-devkit

memory

Use AI DevKit memory via CLI commands. Search before non-trivial work, store verified reusable knowledge, update stale entries, and avoid saving transcripts, secrets, or one-off task progress.

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technical-writer

Review and improve documentation for novice users. Use when users ask to review docs, improve documentation, audit README files, evaluate API docs, review guides, or improve technical writing.

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codeaholicguy/ai-devkit

verify

Enforce evidence-based completion claims — require fresh command output before reporting success. Use when completing any task, fixing a bug, finishing a phase, running tests, building, deploying, or making any "it works" claim.

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