debugger: Coding Workflows for AI Agents | OpenAgentSkill

Overview

--- name: debugger description: "Systematic debugging method: 5-step root-cause analysis (capture, isolate, hypothesize, investigate, fix & verify) plus common bug-pattern reference. Use when errors, exceptions, test failures, or unexpected behavior appear. Loaded automatically by the debugger agent." user-invocable: false ---

# Debugger Skill

> **Director Mode Lite** - Debugging Specialist

---

## 5-Step Root-Cause Method

``` 1. CAPTURE → Collect the full error, reproduce, define expected vs actual 2. ISOLATE → Narrow to the smallest failing case 3. HYPOTHESIZE → List and rank likely causes 4. INVESTIGATE → Test hypotheses, inspect state 5. FIX & VERIFY → Apply the minimal fix, confirm, prevent recurrence ```

## Step 1: Capture

- [ ] Collect the complete error message and stack trace - [ ] Can reproduce the issue with clear steps - [ ] Identify the input that triggered the error - [ ] Know expected vs actual behavior

## Step 2: Isolate

- [ ] Identify the failure location from the stack trace - [ ] Which file(s) and function(s) are involved? - [ ] When did it start? (`git bisect`, `git log`) - [ ] Narrow down to the smallest reproducible case

## Step 3: Hypothesize

- [ ] List possible causes based on evidence - [ ] Rank hypotheses by likelihood - [ ] Design a test to confirm or eliminate each

## Step 4: Investigate

- Analyze error messages and logs carefully - Add strategic debug logging; inspect variable state at key points - Check for: null/undefined values, type mismatches, race conditions, resource exhaustion, external service failures

### Common Bug Patterns

| Pattern | Signs | Common Fix | |---------|-------|------------| | Null/Undefined | `Cannot read property of undefined` | Add null checks / optional chaining | | Off-by-one | Loop runs one too many/few times | Check loop bounds | | Race condition | Intermittent failures | Add synchronization | | Type coercion | `"1" + 1 = "11"` | Explicit type conversion | | Async issues | `Promise { <pending> }` | Await/handle promises |

By language and domain: - **JavaScript/TypeScript**: `undefined is not a function` (binding), `Cannot read property of null` (optional chaining), promise rejections (async/await handling), type errors (strict mode) - **Python**: `AttributeError` (init/typos), `TypeError` (type validation), `ImportError` (paths, circular imports), `KeyError` (dict defaults) - **Database**: connection timeouts (pool exhaustion), constraint violations (validation, foreign keys), deadlocks (transaction ordering) - **API/Network**: 4xx (request validation, auth), 5xx (server-side, resource limits), timeouts (network, long-running queries)

### Investigation Tools

```bash # Search for error message grep -r "error message" src/

# Find recent changes git log --oneline -20 git diff HEAD~5

# Check specific function grep -r "functionName" src/ ```

## Step 5: Fix & Verify

Apply the solution: - Make the minimal change; don't refactor while fixing; one fix per commit

Confirm the fix: - [ ] Original issue is resolved - [ ] No new issues introduced - [ ] Tests pass; add a test to prevent recurrence - [ ] Manual verification done

## Output Format

```markdown ## Debug Report

### Issue [Description of the bug]

### Reproduction Steps 1. Step one 2. Step two 3. Observe error

### Root Cause [Explanation of why this happens]

### Location - **File**: `src/utils/parser.ts` - **Line**: 45-52 - **Function**: `parseInput()`

### Fix Applied [Description of the fix]

### Verification - [x] Issue resolved - [x] Tests pass - [x] No regression ```

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License: MIT
Version: 1.0.0
Last GitHub push: Aug 31, 2026
Registry updated: Sep 7, 2026
Instruction path: skills/debugger/SKILL.md @ 099306a98ec1

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Quality

66/100

Promising

Trust

63/100

Sandbox only

Audit

77/100

Needs review

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Creator: claude-world
Source: claude-world/director-mode-lite
Indexed by: OpenAgentSkill community index

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