langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- Empty `AIMessage` when using `astream()` with Anthropic programmatic tool calling
- Python 3.14 support
- Structured output and tool invocation
- Feature Request: Add StreamEventName Literal type for type-safe event handling in astream_events
- ShellToolMiddleware does not work with InMemorySaver
- fix(langchain): filter non-serializable state in Send for `ShellToolMiddleware`
- ToolRuntime isn't injected into BaseTool subclass's _run
- fix(core): inject additional kwargs into `BaseTool` `_run` and `_arun`
- When using OpenAI Responses API in streaming mode, there is no chunk from langchain that contains the entire function_call definition including arguments.
- SummarizationMiddleware breaks Anthropic extended thinking by removing thinking blocks during active assistant turns
- Docs
- Python not yet supported