Sequential tool executor implementation.

## SequentialToolExecutor

```python
class SequentialToolExecutor(ToolExecutor)
```

Defined in: [src/strands/tools/executors/sequential.py:18](https://github.com/strands-agents/harness-sdk/blob/main/strands-py/src/strands/tools/executors/sequential.py#L18)

Sequential tool executor.