langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- core: `InMemoryVectorStore` raises `NotImplementedError` for relevance-score search and the `similarity_score_threshold` retriever
- MCP ResourceLink/EmbeddedResource metadata dropped when converting to LangChain content blocks (langchain.mcp)
- langchain: preserve result-level MCP `_meta` in tool results
- langchain 1.4.0: any after_model middleware using documented `jump_to="tools"` bypasses the HITL pending_tool_calls gate and re-executes rejected tool calls
- UsageMetadataCallbackHandler silently drops usage_metadata when model_name is missing
- ResourceLink, EmbeddedResource Metadata Loss During MCP to LangChain Conversion
- Calling `_convert_mcp_content_to_lc_block` with a `ResourceLink` conflicts with `langchain-aws` `_messages_to_bedrock` (and possibly others)
- Set output schema from mcp tool
- [Feature Request]: MCP Tasks
- How to send custom stream events from an MCP Client to an app connected to an agent, similar to `get_stream_writer` (langgraph) with `custom` mode?
- Docs
- Python not yet supported