tools = [
        ...tools,
        {
          type: “query”,
          function: {
            name: “product-query”,
            description: “Handles queries about products or services using the assigned knowledge base.”
          }
        }
      ];
let toolId = null;

    if(vapiFileIds.length > 0) {
      try {
        const toolPayload = {
          type: “query”,
          function: {
            name: “product-query”,
            description: “Handles queries about products or services using the assigned knowledge base.”
          },
          knowledgeBases: [
            {
              provider: “google”,
              name: “product-kb”,
              description: “Use this knowledge base when the user asks or queries about the product or services”,
              fileIds: vapiFileIds
            }
          ]
        };

        const response = await axios.post(`https://api.vapi.ai/tool/`, toolPayload, {
          headers: {
            Authorization: `Bearer ${config?.vapiApiKey}`,
            “Content-Type”: “application/json”,
          },
        });
        toolId = response.data.id;
        console.log(“Product-query tool created/updated with knowledge base file IDs:“, response);
      } catch(toolError) {
        console.error(“Failed to create/update product-query tool:“, toolError.response?.data || toolError.message);
      }
    }

    const vapiPayload = {
      name: name || existingAssistant.name,
      model: {
        provider: “openai”,
        model: “gpt-4o-mini”,
        temperature: 1.1,
        emotionRecognitionEnabled: true,
        messages: [
          {
            role: “system”,
            content: systemContent,
          },
        ],
        tools: tools,
        toolIds: toolId ? [toolId] : undefined,
      },
      voice: {
        provider: “11labs”,
        voiceId: voice || existingAssistant.voice || “9BWtsMINqrJLrRacOk9x”,
        speed: 1.1
      },
      messagePlan: {
        idleMessages: [“Can I help you with anything else?“],
        idleMessageMaxSpokenCount: 1,
        idleTimeoutSeconds: 5,
        silenceTimeoutMessage: “Are you still there?”
      },
      startSpeakingPlan: {
        waitSeconds: 0.4,
        smartEndpointingEnabled: true
      },
      stopSpeakingPlan: {
        voiceSeconds: 0.2,
        backoffSeconds: 1
      },
      firstMessage: welcomeMessage || existingAssistant.welcomeMessage || “Hello, how can I assist you today?“,
    };

    try {
      const vapiResponse = await axios.put(`https://api.vapi.ai/assistant/${assistantId}`, vapiPayload, {
        headers: {
          Authorization: `Bearer ${config?.vapiApiKey}`,
          “Content-Type”: “application/json”,
        },
      });
      res.status(200).json({
        success: true,
        message: “Assistant create successfully!“,
        data: vapiResponse,
      });
    } catch(error) {
      console.error(“Vapi API error details:“, error.response?.data);
      throw error;
    }