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fix(llm-completion): add transformations for providers requiring a user message #9162

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Merged
merged 1 commit into from
Sep 16, 2025
Merged

fix(llm-completion): add transformations for providers requiring a user message #9162

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29 changes: 22 additions & 7 deletions packages/shared/src/server/llm/fetchLLMCompletion.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,21 @@ import { HttpsProxyAgent } from "https-proxy-agent";

const isLangfuseCloud = Boolean(env.NEXT_PUBLIC_LANGFUSE_CLOUD_REGION);

const PROVIDERS_WITH_REQUIRED_USER_MESSAGE = [
LLMAdapter.VertexAI,
LLMAdapter.Anthropic,
];

const transformSystemMessageToUserMessage = (
messages: ChatMessage[],
): BaseMessage[] => {
const safeContent =
typeof messages[0].content === "string"
? messages[0].content
: JSON.stringify(messages[0].content);
return [new HumanMessage(safeContent)];
};

type ProcessTracedEvents = () => Promise<void>;

type LLMCompletionParams = {
Expand Down Expand Up @@ -174,13 +189,13 @@ export async function fetchLLMCompletion(
};

let finalMessages: BaseMessage[];
// VertexAI requires at least 1 user message
if (modelParams.adapter === LLMAdapter.VertexAI && messages.length === 1) {
const safeContent =
typeof messages[0].content === "string"
? messages[0].content
: JSON.stringify(messages[0].content);
finalMessages = [new HumanMessage(safeContent)];
// Some providers require at least 1 user message
if (
messages.length === 1 &&
PROVIDERS_WITH_REQUIRED_USER_MESSAGE.includes(modelParams.adapter)
) {
// Ensure provider schema compliance
finalMessages = transformSystemMessageToUserMessage(messages);
} else {
finalMessages = messages.map((message) => {
// For arbitrary content types, convert to string safely
Expand Down