Bug Fix Brief Agent Skill

Generates a structured Bug Fix Brief (BFB) to document issue corrections. Includes root cause analysis, repro steps, fix options, and fix checklist. Use when user asks to create a BFB, document a bug fix, or generate a bug correction document.

876 tokens

context cost

the whole folder, loaded on every use

files

instructions only

copies elsewhere

how many repositories repackaged it

316

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/giuseppe-trisciuoglio/developer-kit --skill bug-fix-brief

The instruction itself

11 sections, as written by the author

Bug Fix Brief (BFB)

Overview

This skill generates a Bug Fix Brief (BFB): a structured document in docs/bfb/ that uniformly captures every bug fix with root cause, repro steps, fix options, and checklist.

When to Use

User asks to create a BFB
User wants to document a bug fix in a structured way
After identifying the root cause of a bug and before implementing the fix

Trigger: "create BFB", "document bug", "bug fix brief", "document fix"

Instructions

Phase 1: Gather Information

Check existing numbering:

ls docs/bfb/ 2>/dev/null || echo "Directory does not exist"

Ask the user for:

BFB number (or propose next sequential)
Concise title (3-5 words, kebab-case)
Issue link (e.g. #1287)
Environment (Prod/Stg/Dev) + version
Observed vs expected behavior
File/function/line of the cause

Phase 2: Generate Template

Complete the full BFB template:

## BFB-XXX: [Title]

**Reference:** [Issue link]
**Environment:** [Env] `vX.Y.Z`
**Date:** YYYY-MM-DD

---

### 1. Bug
- **Observed:** [wrong behavior]
- **Expected:** [correct behavior]

### 2. Repro

→ [error/output]


### 3. Cause
`path/file.ext` — `function()` @ line N
[Why it happens, max 3 lines]

### 4. Decision
| Option | Fix | Choice |
|--------|-----|--------|
| A | [desc] | ✅/❌ |
| B | [desc] | ✅/❌ |

**Rationale:** [why]

### 5. Fix
- [ ] [change 1]
- [ ] [test]
- [ ] [verify repro]

### 6. Notes
[recurring patterns, links, warnings]

Phase 3: Ask Confirmation

Show the generated BFB and ask with AskUserQuestion:

"Create the BFB"
"Edit before creating"
"Cancel"

Phase 4: Write to Disk

Only after approval:

mkdir -p docs/bfb

Write to docs/bfb/BFB-XXX-title.md

Examples

Input: "create BFB for login email null crash"

Final output:

## BFB-042: Login crash with null email

**Reference:** #1287
**Environment:** Prod `v2.4.1`
**Date:** 2026-05-02

---

### 1. Bug
- **Observed:** App crashes if email field is empty
- **Expected:** Error message "Email required"

### 2. Repro

Open login screen
Tap "Login" without entering email

→ NullPointerException @ AuthManager.kt:34


### 3. Cause
`AuthManager.kt` — `validateEmail()` @ line 34
Missing null check on email.trim()

### 4. Decision
| Option | Fix | Choice |
|--------|-----|--------|
| A | Add safe call `?.` | ✅ |
| B | Refactor with Result type | ❌ |

**Rationale:** Option A is minimal, zero impact.

### 5. Fix
- [ ] Add `email?.trim()?.isNotEmpty() == true`
- [ ] Test `validateEmail_null_returnsFalse()`
- [ ] Verify repro

### 6. Notes
- Check other forms for missing null checks

Best Practices

Sequential numbering: BFB-001, BFB-002, no gaps
Concise title: 3-5 words, kebab-case in filename
Root cause: exact file, function, line
2+ fix options: with pros/cons and rationale
Verifiable checklist: each item must be testable

Constraints and Warnings

Confirmation required: Always ask before writing
Max 3 lines for cause: Stay concise
Directory docs/bfb/: Create if it does not exist

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How to use it

Copy the folder

Take giuseppe-trisciuoglio/bug-fix-brief from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.