Bugfix and Debug

Exclusive to: debugger agent

MCP Helpers (Brain + Memory)

🧠 Gemini-Bridge (Brain) — Deep Error Analysis

code

mcp_gemini-bridge_consult_gemini(query="Root cause analysis: [error message]. Stack trace: [trace]", directory=".")

🌉 Open-Bridge — Alternative Error Analysis

code

mcp_open-bridge_consult_gemini(query="Root cause analysis: [error message]. Stack trace: [trace]", directory=".")

📚 Context7 (Memory) — Up-to-Date Docs

Lookup error patterns and fixes in official docs:

code

mcp_context7_resolve-library-id(libraryName="[library]", query="[error type]")
mcp_context7_query-docs(libraryId="/[resolved-id]", query="[specific error message]")

Validation Loop (MANDATORY)

Before completing any fix, run this verification sequence:

bash

composer test            # All PHP tests pass
npm run types           # No TypeScript errors
npm run lint            # No linting errors

If any command fails, investigate and fix before reporting completion.

Instructions

Phase 1: Evidence Collection

•Capture exact error message and stack trace
•Identify reproduction steps (command + inputs)
•Note when it started (recent changes?)
•Check logs: storage/logs/laravel.log

Phase 2: Hypothesis Formation

Form 1-3 ranked hypotheses based on:

•Error message keywords
•Stack trace file paths
•Recent git changes
•Similar past issues

Phase 3: Verification

bash

# Search for error patterns
grep -r "error text" --include="*.php" --include="*.tsx" app/ resources/

# Check recent changes
git log --oneline -10
git diff HEAD~3

# Run isolated test
php artisan test --filter=TestName

Phase 4: Minimal Fix

•Fix root cause, not symptoms
•Make smallest change possible
•Consider related edge cases

Phase 5: Regression Prevention

•Add/update test covering the fixed case
•Verify test fails without fix, passes with fix

Common Laravel Error Patterns

Error	Likely Cause	Solution
`ModelNotFoundException`	Wrong ID, missing record	Check route model binding
`ValidationException`	Invalid input	Review FormRequest rules
`AuthorizationException`	Policy failure	Check policy methods
`QueryException`	SQL error	Check migration/schema
`TokenMismatchException`	CSRF issue	Add @csrf directive
`Class not found`	Autoload issue	Run `composer dump-autoload`

Common React/TypeScript Errors

Error	Likely Cause	Solution
`Cannot read property of undefined`	Null access	Add optional chaining `?.`
`Type 'X' is not assignable`	Type mismatch	Fix interface/props
`Hook call violation`	Hook in wrong place	Move to component
`Hydration mismatch`	SSR/client diff	Use `useEffect`

Debugging Commands

bash

# Laravel
php artisan tinker                    # Interactive REPL
tail -f storage/logs/laravel.log     # Watch logs
php artisan route:list               # Check routes
php artisan migrate:status           # Check migrations

# Frontend
npm run types                        # TypeScript errors
npm run lint                         # ESLint issues

Output Template

markdown

## 🐛 Bug
[One sentence description]

## 🔍 Root Cause
[What was wrong and why]

## 🔧 Fix
| File | Change |
|------|--------|
| `path/file` | Description |

## 🧪 Regression Test
[Test name and coverage]

## ✅ Verification
$ [command]
[output]

Examples

•"Fix this failing Pest test"
•"Users can't log in; find why and patch it safely"
•"Debug why form submission fails with 500 error"