# ChainManagerMixin

> **Class** in `langchain_core`

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

Mixin for chain callbacks.

## Signature

```python
ChainManagerMixin()
```

## Methods

- [`on_chain_end()`](https://reference.langchain.com/python/langchain-core/callbacks/base/ChainManagerMixin/on_chain_end)
- [`on_chain_error()`](https://reference.langchain.com/python/langchain-core/callbacks/base/ChainManagerMixin/on_chain_error)
- [`on_agent_action()`](https://reference.langchain.com/python/langchain-core/callbacks/base/ChainManagerMixin/on_agent_action)
- [`on_agent_finish()`](https://reference.langchain.com/python/langchain-core/callbacks/base/ChainManagerMixin/on_agent_finish)

---

[View source on GitHub](https://github.com/langchain-ai/langchain/blob/02991cb4cf2063d51a07268edafb05fe53de1826/libs/core/langchain_core/callbacks/base.py#L128)