langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- fix(openrouter): support `default_headers` for custom HTTP header injection
- `wrap_model_call` middleware ToolStrategy narrowing has no effect — model still sees all structured output tools
- feat(openai): concurrent batch API calls in async embedding methods
- ChatBedrockConverse crashes on function_call content blocks from OpenAI Responses API when used with ModelFallbackMiddleware
- Add chat_template_kwargs to ChatHuggingFace for passing extra options to apply_chat_template
- `BaseTool.model_dump(mode="json")` fails on `args_schema`, `func`, and `coroutine` fields
- bug(text-splitters): ExperimentalMarkdownSyntaxTextSplitter has O(n²) performance due to list.pop(0)
- bug(core): convert_to_openai_function mishandles optional TypedDict fields
- bug(core): BaseTool.arun handles pydantic v1 validation differently from run
- bug(core): filter_messages leaves OpenAI function_call blocks after excluding tool calls
- Docs
- Python not yet supported