Web Reference: Jan 2, 2019 ยท Python API reference for tools.base.BaseTool.handle_validation_error in langchain_core. Part of the LangChain ecosystem. Jun 7, 2024 ยท Output parsers in Langchain receive a string, not structured data. They are used to do what you are already doing with with_structured_output, parse some input string into structured data, or possibly change its format. Dec 27, 2025 ยท Fix LangChain errors including chain invoke failures, memory issues, vector store errors, agent loops, and retrieval problems with practical Python solutions.
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