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server/_core/llm.ts

@@ -171,6 +171,45 @@ const normalizeMessage = (message: Message) => {
   };
 };
 
+const normalizeToolChoice = (
+  toolChoice: ToolChoice | undefined,
+  tools: Tool[] | undefined
+): "none" | "auto" | ToolChoiceExplicit | undefined => {
+  if (!toolChoice) return undefined;
+
+  if (toolChoice === "none" || toolChoice === "auto") {
+    return toolChoice;
+  }
+
+  if (toolChoice === "required") {
+    if (!tools || tools.length === 0) {
+      throw new Error(
+        "tool_choice 'required' was provided but no tools were configured"
+      );
+    }
+
+    if (tools.length > 1) {
+      throw new Error(
+        "tool_choice 'required' needs a single tool or specify the tool name explicitly"
+      );
+    }
+
+    return {
+      type: "function",
+      function: { name: tools[0].function.name },
+    };
+  }
+
+  if ("name" in toolChoice) {
+    return {
+      type: "function",
+      function: { name: toolChoice.name },
+    };
+  }
+
+  return toolChoice;
+};
+
 const resolveApiUrl = (model: string) => {
   const hfToken = process.env.HF_TOKEN || process.env.HF_ACCESS_TOKEN;