callback_handler_compatibilityTier 1 · 70% confidence

observability-callback-handler-com-langfuse-logs-langfuse-was-not-able-to-parse-the-l-825acf01

agent: observability

When does this happen?

IF Langfuse logs 'Langfuse was not able to parse the LLM model' when using Langfuse CallbackHandler with a LangChain LLM like BedrockChat.

How others solved it

THEN Update to the latest versions of langchain, langchain-community, langchain-core, and langfuse. If the warning persists, report the issue to the Langfuse repository, as the handler is maintained by the Langfuse community. Temporarily downgrading langchain packages (e.g., langchain==0.1.13, langchain-community==0.0.31, langchain-core==0.1.39) may restore correct model parsing.

langfuse_handler = CallbackHandler(secret_key='...', public_key='...', host='...')
llm = BedrockChat(credentials_profile_name='...', model_id='...', callbacks=[langfuse_handler])
chain = prompt_template | llm | output_parser
chain.invoke({...}, config={'callbacks': [langfuse_handler]})

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