langchain
https://github.com/langchain-ai/langchain
Python
⚡ Building applications with LLMs through composability ⚡
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- Issues
- How to create fallbacks for agents in case some MCP servers (providing tools) cannot be reached?
- Prompts and Resources auto-discovery
- Feature request: Add MCP Sampling support
- structuredContent is dropped from isError=True tool results (but preserved on success)
- How to add persistence sessions when working with langgraph
- Feature Request: Pass `_meta` parameter through to MCP SDK `call_tool()`
- How to apply resources when using create_react_agent?
- Token budget middleware that checks in with the user instead of hard-stopping
- Blob leaks a UTF-8 BOM into as_string()
- langchain-openrouter: ToolMessage content blocks (e.g. images) are sent to the API unconverted, failing client-side with ValidationError
- Docs
- Python not yet supported