langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- fix(anthropic): handle pre-completed content in `message_start` events
- fix(openai): handle missing function field in streaming `tool_calls`
- style(langchain): add ruff rules ARG
- Reasoning trace is not being returned when using an AzureChatOpenAI model from Microsoft Foundry
- Python 3.14 support
- Add AND-capable trigger conditions to Python SummarizationMiddleware (parity with LangChain.js)
- create_agent falls back to ToolStrategy for Gemini 3 models when tools and response_format are passed
- fix(langchain): allow Gemini 3 models to use `ProviderStrategy` with tools
- Structured output and tool invocation
- feat(langchain): add AND/OR trigger logic to summarization middleware
- Docs
- Python not yet supported