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fix: sanitize malformed tool call arguments to prevent vLLM 400 errors #13092

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fix: sanitize malformed tool call arguments to prevent vLLM 400 errors #13092

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27 changes: 19 additions & 8 deletions core/llm/openaiTypeConverters.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -155,14 +155,25 @@ export function toChatMessage(

// Add tool calls if present
if (message.toolCalls) {
msg.tool_calls = message.toolCalls.map((toolCall) => ({
id: toolCall.id!,
type: toolCall.type!,
function: {
name: toolCall.function?.name!,
arguments: toolCall.function?.arguments || "{}",
},
}));
msg.tool_calls = message.toolCalls.map((toolCall) => {
// Sanitize arguments — ensure valid JSON to prevent vLLM 400 errors
// when malformed tool arguments from previous turns are sent back in history
let args = toolCall.function?.arguments || "{}";
try {
JSON.parse(args);
} catch {
// If arguments are not valid JSON, wrap them to prevent server rejection
args = JSON.stringify({ _raw: args });
}
return {
id: toolCall.id!,
type: toolCall.type!,
function: {
name: toolCall.function?.name!,
arguments: args,
},
};
});
}

// Preserving reasoning blocks
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