bugfix-doctor

bugfix-doctor is a skill for Claude Code, Codex from emilyLi2020/WAVE. It costs 51 tokens per session (449 once invoked), scanned A, original, Apache-2.0.

A step-by-step guide for fixing software problems with plain-language explanations. It covers reproducing the problem, finding its cause, changing the code, testing the result, and checking that nothing else broke.

In plain words
What is it for?
Use it to investigate a broken feature, identify the likely faulty file or code section, apply a small fix, and verify the result.
Why use it?
It helps non-coders understand error messages and follow a focused fix without unrelated code changes.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/emilyli2020/wave/bugfix-doctor
Any agent
npx skills add emilyLi2020/WAVE --skill bugfix-doctor
Clone the repo
git clone --depth 1 https://github.com/emilyLi2020/WAVE

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for bugfix-doctor

README.md
[![agentmods](https://agentmods.dev/badge/skills/emilyli2020/wave/bugfix-doctor.svg)](https://agentmods.dev/skills/emilyli2020/wave/bugfix-doctor)
Your own site
<a href="https://agentmods.dev/skills/emilyli2020/wave/bugfix-doctor"><img src="https://agentmods.dev/badge/skills/emilyli2020/wave/bugfix-doctor.svg" alt="Measured on agentmods" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 449 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00051 $0.00449
Opus 5 $0.00026 $0.00225
Sonnet 5 $0.00010 $0.00090
Haiku 4.5 $0.00005 $0.00045

Measured 5d ago against content hash 3905b4412f98, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

bugfix-doctor scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/bugfix-doctor/SKILL.md · 56 lines

What it actually says

Bugfix Doctor

Something is broken and the user does not understand why. Walk them through a systematic fix using plain English at every step.

Step 1: Reproduce

Ask the user:

  • What did you expect to happen?
  • What actually happened?
  • Can you show me the error? (screenshot, error message, or description)

If they provide an error message, translate it into plain English before doing anything else.

Step 2: Isolate

  • Identify the most likely root cause
  • Explain the cause in one sentence without jargon
  • If multiple causes are possible, list them ranked by likelihood
  • Show the user exactly which file and which section contains the problem

Step 3: Fix

  • Apply the smallest possible change that fixes the issue
  • Never refactor unrelated code during a bugfix
  • Never change more than 3 files for a single bug
  • Explain what you changed and why in plain English

Step 4: Test

  • Run the project and verify the fix
  • Walk the user through the same steps that triggered the bug
  • Confirm the bug is gone
  • Check that nothing else broke (run existing tests if available)

Step 5: Report

Return exactly these sections:

  1. Symptom: What the user saw (their words)
  2. Cause: What went wrong (plain English)
  3. Fix: What was changed (file names and a one-line summary per file)
  4. Verification: How to confirm it works
  5. Prevention: One suggestion to avoid this type of bug in the future

Rules

  • Always explain errors in plain English first, before showing code
  • Never blame the user for the bug
  • If the fix is uncertain, say so and propose a safe experiment
  • If you cannot find the cause, say so honestly and suggest next steps
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 5d ago First seen · 56 lines · 51 tokens per session scan A 3905b4412f98

Subscribe to this mod's changes

bugfix-doctor is a skill published in the GitHub repository emilyLi2020/WAVE (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 51 tokens to every session and 449 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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