# CombineDocsProtocol

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/chains/combine_documents/reduce/CombineDocsProtocol)

Interface for the combine_docs method.

## Signature

```python
CombineDocsProtocol()
```

## Extends

- `Protocol`

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/b302691ff9ad841804e93e5addbdc53b6974473b/libs/langchain/langchain_classic/chains/combine_documents/reduce.py#L16)