- Replace LangChain dependencies with native OpenAI and Google Generative AI SDKs
- Rewrite LLMService to use direct API calls for OpenAI and Gemini
- Update core package dependencies to remove LangChain-related packages
- Modify message handling and streaming logic to work with new SDK implementations
- Simplify model configuration and instance management
- Update integration and unit tests to support new SDK approach
- Remove LangChain-specific message conversion and streaming methods
linshen
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