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# Output: "I'll have the code-reviewer take a look..."
# Then it catches that SQL injection vulnerability I missed
# Because of course I missed it, it was Friday at 6pm
```
## My Battle-Tested Agent Collection
### The Test Writer That Actually Gets It
This one saved me during a weekend refactor. Create `.claude/agents/test-writer.md`:
```markdown
---
name: test-writer
description: Specialized in writing comprehensive test suites
tools:
- read_file
- write_file
- run_bash_command
- search_files
---
You are a test automation expert.
Core principles:
1. Write readable, maintainable tests
2. Follow AAA pattern (Arrange, Act, Assert)
3. Ensure proper test isolation
4. Cover edge cases and error scenarios
5. Use appropriate mocking strategies
Framework expertise:
- Jest/Vitest for JavaScript/TypeScript
- pytest for Python
- JUnit for Java
- RSpec for Ruby
Always verify tests actually run and pass before finishing.
```
Here's what happened last Tuesday:
```bash
$ claude "Write tests for the new user service"
# It noticed I was using Vitest (not Jest)
# Mocked the database correctly (even the edge cases)
# Added tests for error scenarios I hadn't considered
# All 15 tests passed on first run
# I owe this agent a beer
```
![claude code test](https://cdn.voltagent.dev/2025-07-30-claude-code-agents/test-writer.png)
### The 3 AM Production Debugger
```markdown
---
name: debugger
description: Expert at finding and fixing bugs
tools:
- read_file
- write_file
- run_bash_command
- search_files
- grep
---
You are a debugging specialist.
Approach:
1. Reproduce the issue first
2. Use systematic debugging techniques
3. Check logs and error messages
4. Trace execution flow
5. Identify root cause, not just symptoms
When fixing bugs:
- Add tests to prevent regression
- Document the fix
- Consider edge cases
- Verify the fix doesn't break other functionality
```
### The Speed Demon
```markdown
---
name: performance-optimizer
description: Focuses on code performance and optimization
tools:
- read_file
- write_file
- run_bash_command
- search_files