langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- feat(anthropic): support Claude Haiku 5.5
- anthropic: treat Bedrock Claude model IDs like their canonical names in the mid-conversation system message check
- astream_events v2 does not emit terminal error events for failed runs
- [Feature]: Add format_context utility in langchain_core.documents for RAG prompts
- SummarizationMiddleware replaces history with a placeholder when no HumanMessage falls in the trim window
- XMLOutputParser.parse() removes valid elements with encoding attributes followed by newlines
- merge_message_runs raises for ChatMessage roles and FunctionMessage names that differ
- Support fraction-of-context-window option for trim_tokens_to_summarize in SummarizationMiddleware
- Add SiaMesh x402 Secure Scraper Tool
- ollama: `ChatOllama` sends tool results without `tool_name`, so models see them as an unknown tool
- Docs
- Python not yet supported