# ToolManagerMixin

> **Class** in `langchain_core`

📖 [View in docs](https://reference.langchain.com/python/langchain-core/callbacks/base/ToolManagerMixin)

Mixin for tool callbacks.

## Signature

```python
ToolManagerMixin()
```

## Methods

- [`on_tool_end()`](https://reference.langchain.com/python/langchain-core/callbacks/base/ToolManagerMixin/on_tool_end)
- [`on_tool_error()`](https://reference.langchain.com/python/langchain-core/callbacks/base/ToolManagerMixin/on_tool_error)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/fb6ab993a73180538f6cca876b3c85d46c08845f/libs/core/langchain_core/callbacks/base.py#L200)