langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- bug(core): same-index tool_call chunks in one streamed delta can split into blank tool_calls and invalid_tool_calls
- Doesn't honour pydantic model field datatype and randomly throws `langchain_core.exceptions.OutputParserException`
- PydanticSerializationUnexpectedValue warning when using structured output for AzureChatOpenAI
- bug(anthropic): ChatAnthropic sends assistant prefill for models that don't support it
- Bug: RunnableWithFallbacks.__getattr__ raises NameError on methods with unresolvable forward-ref annotations
- `ChatOpenRouter` silently swallows `default_headers`
- 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
- `ChatOllama.bind_tools()` with large system prompt suppresses reasoning output on `gemma4:26b` (investigating upstream)
- feat(openai): concurrent batch API calls in async embedding methods
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