Pattern preview · 12 of 4,089 sample rules shown · site-specific intelligence stays private
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langchain_prompt_placeholder
ai-agents-langchain-prompt-pla-calling-getlangchainprompt-without-resolving-all-p-62b64650
IFCalling getLangchainPrompt() without resolving all placeholders causes Langchain error because unresolved placeholders are returned as {variableName, optional} instead of {type: 'placeholder', name: ...}.
THENUpgrade to Langfuse JS/TS SDK v4.2.0 or later, where the issue is fixed. If upgrade not possible, manually transform the output: map objects with variableName and optional to { type: 'placeholder', name: msg.variableName } before passing to ChatPromptTemplate.fromMessages().
Tier 170%
langchain_prompt_placeholder
ai-agents-langchain-prompt-pla-when-using-getlangchainprompt-without-providing-al-9430a4af
IFWhen using getLangchainPrompt without providing all placeholders, the SDK returns unresolved placeholders as { variableName, optional } objects instead of Langchain's expected { type: 'placeholder', name } format, causing ChatPromptTemplate.fromMessages to throw an error.
THENManually map unresolved placeholder objects by converting { variableName, optional } to { type: 'placeholder', name: variableName } before passing to Langchain, or upgrade to Langfuse JS/TS SDK v4.2.0+ where the issue is fixed. Example: const fixedMessages = rawMessages.map(msg => msg.variableName ? { type: 'placeholder', name: msg.variableName } : msg);
Tier 170%
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