## Summary

The implementation is complete and meets all requirements:

- **Function name:** `add` ✓
- **Parameters:** `a: number` and `b: number` ✓
- **Return type:** `number` ✓
- **JSDoc comment:** Comprehensive documentation with description, parameters, return value, and example ✓
- **Logic:** Correctly returns the sum of two numbers ✓

The function is ready to be added to your TypeScript codebase.