How to implement the logic of bindTools and withStructuredOutput for providers that do not support tool_choice and structured output ?

[loss-and-quick]

Problem Description

In my project, users have the flexibility to utilize any custom provider that is compatible with the OpenAI API. However, I have encountered a significant issue: many of these providers do not support tool_choice and structured output.

This raises a critical question: why doesn't LangChain offer a fallback option that allows for the processing of tool_choice and structured output through standard queries?

Key Points

• Custom Providers: Users can integrate any provider with a compatible OpenAI API.
• Lack of Support: Numerous providers fail to support essential features like tool_choice and structured output.
• LangChain's Limitations: There seems to be a lack of fallback mechanisms in LangChain for handling these features.

Inquiry

Is it theoretically feasible to implement a solution that processes tool_choice and structured output using standard queries?