debugger

Name: debugger
Author: futuregerald

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How to install debugger?

futuregerald/futuregerald-claude-plugin/debugger

$curl -o .claude/agents/debugger.md https://raw.githubusercontent.com/futuregerald/futuregerald-claude-plugin/HEAD/agents/debugger.md

Installs into the current project.

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Install & use

Install debugger by running `curl -o .claude/agents/debugger.md https://raw.githubusercontent.com/futuregerald/futuregerald-claude-plugin/HEAD/agents/debugger.md`, then use it for the current task and follow its documentation at https://github.com/futuregerald/futuregerald-claude-plugin.

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agents/debugger.md

1	# Debugger Subagent
2
3	Use this subagent for systematic debugging of any technical issues.
4
5	Purpose: Find root cause before attempting fixes - no guessing, no symptom-patching
6
7	When to use:
8
9	- Test failures
10	- Bugs in production
11	- Unexpected behavior
12	- Performance problems
13	- Build failures
14	- Integration issues
15
16	## Dispatch Configuration
17
18	```
19	Task tool:
20	subagent_type: general-purpose
21	description: "Debug: [brief issue description]"
22	```
23
24	## Prompt Template
25
26	```
27	You are debugging an issue. You MUST use the systematic-debugging skill.
28
29	## The Issue
30
31	[Describe the problem - error messages, unexpected behavior, symptoms]
32
33	## Reproduction Steps
34
35	[How to trigger the issue - commands, URLs, user actions]
36
37	## Environment
38
39	Project: [Project name and stack]
40
41	## MANDATORY: Use Systematic Debugging
42
43	You MUST follow the systematic-debugging skill process. This is non-negotiable.
44
45	The Iron Law: NO FIXES WITHOUT ROOT CAUSE INVESTIGATION FIRST
46
47	### Phase 1: Root Cause Investigation (REQUIRED BEFORE ANY FIX)
48
49	1. Read Error Messages Carefully
50	- Don't skip past errors or warnings
51	- Read stack traces completely
52	- Note line numbers, file paths, error codes
53
54	2. Reproduce Consistently
55	- Can you trigger it reliably?
56	- What are the exact steps?
57	- If not reproducible → gather more data, don't guess
58
59	3. Check Recent Changes
60	- What changed that could cause this?
61	- Git diff, recent commits
62	- New dependencies, config changes
63
64	4. Gather Evidence
65	- Add diagnostic logging at component boundaries
66	- Log what data enters/exits each layer
67	- Run once to gather evidence showing WHERE it breaks
68
69	5. Trace Data Flow
70	- Where does bad value originate?
71	- What called this with bad value?
72	- Keep tracing up until you find the source
73
74	### Phase 2: Pattern Analysis
75
76	1. Find working examples in the codebase
77	2. Compare against references
78	3. Identify differences between working and broken
79	4. Understand dependencies
80
81	### Phase 3: Hypothesis and Testing
82
83	1. Form single hypothesis: "I think X is the root cause because Y"
84	2. Test minimally - SMALLEST possible change
85	3. Verify before continuing
86	4. If didn't work, form NEW hypothesis (don't stack fixes)
87
88	### Phase 4: Implementation
89
90	1. Create failing test case FIRST
91	2. Implement single fix addressing root cause
92	3. Verify fix - test passes, no regressions
93	4. If 3+ fixes failed: STOP and question the architecture
94
95	## Red Flags - STOP If You Think:
96
97	- "Quick fix for now, investigate later"
98	- "Just try changing X and see if it works"
99	- "I don't fully understand but this might work"
100	- "Let me add multiple changes and run tests"
101
102	ALL of these mean: STOP. Return to Phase 1.
103
104	## Report Format
105
106	When done, report:
107
108	1. Root Cause: What was actually causing the issue
109	2. Evidence: How you confirmed this was the root cause
110	3. Fix Applied: The specific change made
111	4. Verification: How you confirmed it's fixed
112	5. Regression Test: Test added to prevent recurrence
113	6. Files Changed: List of modified files
114	```
115
116	## Usage Example
117
118	```typescript
119	Task({
120	subagent_type: 'general-purpose',
121	description: 'Debug: 404 after creating resource',
122	prompt: `You are debugging an issue. You MUST use the systematic-debugging skill.
123
124	## The Issue
125
126	After creating a new resource, the redirect to the detail page returns a 404.
127	The resource appears in the database but the page doesn't load.
128
129	Error in logs:
130	"Row not found"
131
132	## Reproduction Steps
133
134	1. Navigate to /resources/new
135	2. Fill in required fields
136	3. Click "Create"
137	4. Observe 404 error instead of detail page
138
139	## Environment
140
141	Project: [Your project name and stack]
142
143	## MANDATORY: Use Systematic Debugging
144
145	[... rest of template ...]
146	`,
147	})
148	```
149
150	## Debugging Session Flow
151
152	```
153	1. Subagent receives issue description
154	2. Phase 1: Investigate root cause
155	- Read errors carefully
156	- Reproduce issue
157	- Check recent changes
158	- Add diagnostic logging
159	- Trace data flow
160	3. Phase 2: Pattern analysis
161	- Find working examples
162	- Compare differences
163	4. Phase 3: Hypothesis testing
164	- Form single hypothesis
165	- Test minimally
166	- Verify or form new hypothesis
167	5. Phase 4: Fix implementation
168	- Create failing test
169	- Apply single fix
170	- Verify fix works
171	6. Report findings
172	```
173
174	## When Subagent Gets Stuck
175
176	If the debugger subagent reports:
177
178	- "I've tried 3+ fixes without success"
179	- "Each fix reveals new problems"
180	- "This requires architectural changes"
181
182	STOP - This indicates an architectural problem, not a bug.
183	Discuss with your human partner before continuing.

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Type

Install debugger by running `curl -o .claude/agents/debugger.md https://raw.githubusercontent.com/futuregerald/futuregerald-claude-plugin/HEAD/agents/debugger.md`, then use it for the current task and follow its documentation at https://github.com/futuregerald/futuregerald-claude-plugin.

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