Add bind_functions method to BedrockChat to support LangGraph

[KBB99]

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Feature request

Add bind_functions to Bedrock Chat to support Langgraph.

Motivation

Currently I cannot use Bedrock with Langgraph since it makes use of OpenAI's bind_functions method. I want a function that does the same thing for Bedrock to make it compatible with Langgraph. Claude 3 Opus will soon be supported on Bedrock and it outperforms all other LLMs, from what I've seen at least, and it would be great to test my use-cases with it.

Proposal (If applicable)

Add support for Anthropic function calling building in Anthropic function calling as seen here https://github.com/anthropics/anthropic-tools to the Bedrock Chat class https://github.com/langchain-ai/langchain/blob/master/libs/community/langchain_community/chat_models/bedrock.py#L48.

[tomdzh]

+1 this would be a nice feature since more people start using Anthropic models through AWS Bedrock.

[efriis]

Hey there! We have an experimental wrapper for anthropic models for tool calling in the langchain_anthropic package, and we'll probably wait to add this to bedrock until some bedrock models officially support tool calling and structured output!

[efriis]

(currently none of the bedrock models natively support tool calling as far as I know - let me know if I'm incorrect on that though!)

[KBB99]

Anthropic does indeed now support function calling. Langchain has a library for function calling with Claude, but it is not optimized for Anthropic so to speak. Instead it would be best to replicate this with Anthropic as they do here: https://github.com/anthropics/anthropic-tools . Happy to help with the implementation.

[sibijr]

+1 for this feature.

[saurabhgaur]

I was trying to get the langgraph cycles example (https://python.langchain.com/docs/langgraph#cycles) to work with ChatAnthropicTools instead of ChatOpenAI. The model does identify the right tool to call, however, looks like there are format differences that cause failures in the current implementations of the should_continue and tool_executor . It will be great if this can be made to work to support AWS + Claude combo for companies that don't use Azure.

[ankitgupta-ag]

@efriis for folks using Bedrock to access Anthropic models, this feature is needed now that Anthropic models themselves directly support tool calling. Can you please reopen this issue?