langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- Support forwarding MCP _meta on tool calls and surfacing server response metadata
- Many tests fail
- Output parsers drop tool calls when a chat model falls back to invoke inside stream(), so structured output streams nothing
- SummarizationMiddleware: _get_approximate_token_counter doesn't recognize Claude on Bedrock (ChatBedrockConverse), so summarization triggers late
- Support MCP Apps (SEP-1865) in LangChain hosts
- ChatPerplexity.stream() crashes with TypeError when `stop` sequences are passed
- RunnableWithFallbacks.batch/abatch never close root runs when an input raises an exception not in exceptions_to_handle
- langchain-typesafe: validate ModelRouterMiddleware classifier routes
- feat(typesafe): experimental classifier based `TsChoiceToolSelectorMiddleware`
- feat(typesafe): experimental add `TsHybridToolSelectorMiddleware`
- Docs
- Python not yet supported