# getattr(x, 'field', default) used for type-dispatch polymorphism is banned

### 17.5 Banned: `getattr(x, 'field', default)` for type dispatch

```python
# BANNED:
tool_id = getattr(tc, "id", "") or ""
tool_name = getattr(tc.function, "name", "") or ""

# CORRECT:
tool_id = tc.id
tool_name = tc.function.name
```