langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- bug(openai): _create_usage_metadata crashes with TypeError when service_tier is set and cached_tokens is missing
- Support OpenAI token count API
- Blob.as_bytes_io() raises NotImplementedError for string data
- feat(middleware): TodoListMiddleware should survive summarization
- 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`
- Docs
- Python not yet supported