langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- langchain-openai: gpt-6.1-terra profile is missing mid-conversation and reasoning-effort overrides
- `create_agent` ends the run on an Anthropic `pause_turn` response (server tools such as web search)
- Feature: HumanInTheLoopMiddleware for Agent workflows
- langchain-deepseek: list-form tool results are sent as ASCII-escaped JSON, inflating non-English tool output ~5x
- EarlyReturnMiddleware: dynamically short-circuit the last LLM call of an agentic loop invocation
- with_structured_output with dict/JSON schema silently returns None on unrecognized tool name
- `HumanInTheLoopMiddleware`: record the human decision on the resulting ToolMessage
- fix(langchain): redact `PIIMiddleware` output before it streams or persists
- ChatHuggingFace not working with structured output
- XMLOutputParser.transform() has quadratic runtime on non-XML streaming prefixes
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- Python not yet supported