# BaseCallbackHandler

> **Class** in `langchain_core`

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

Base callback handler.

## Signature

```python
BaseCallbackHandler()
```

## Extends

- `LLMManagerMixin`
- `ChainManagerMixin`
- `ToolManagerMixin`
- `RetrieverManagerMixin`
- `CallbackManagerMixin`
- `RunManagerMixin`

## Properties

- `raise_error`
- `run_inline`
- `ignore_llm`
- `ignore_retry`
- `ignore_chain`
- `ignore_agent`
- `ignore_retriever`
- `ignore_chat_model`
- `ignore_custom_event`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/02991cb4cf2063d51a07268edafb05fe53de1826/libs/core/langchain_core/callbacks/base.py#L455)