@User @User @User I'm currently integrating tool responses into my Vapi agent workflow. The tool is returning correct JSON data (e.g., technician details), but the agent is responding with incorrect information. In platforms like Retell, we can dynamically capture tool results using variables and inject them into the agent's response logic. Despite the tool returning accurate data, there's no clear way to capture and reuse the tool response as a dynamic variable inside the Vapi dashboard agent. This makes it difficult to ensure the agent speaks based on the latest tool output. Is there a way to bind tool responses to variables inside the agent's prompt or logic? https://cdn.discordapp.com/attachments/1460701116185448459/1460701117284487228/image.png?ex=697a546c&is=697902ec&hm=5d8b91a8286b50ee3a8678a773e3b25c1cd9c783c4375af09786c93c7112b0a2& https://cdn.discordapp.com/attachments/1460701116185448459/1460701118148645015/image.png?ex=697a546d&is=697902ed&hm=6ef9abe9b2e59f521bcf684d70d467ed921b489b6b3e7de6d902bb19b6cc0432&

Use a API Request-type tool to retrieve the specific information, additionally use the test tool option to validate the results

Here is a link to the documentation regarding best practices in assigning tool results to a variable, then using those variables in the assistant's response: https://docs.vapi.ai/prompting-guide#example-appointment-setter-prompt

@GeraDeluxer Is there a way to check the data coming into Vapi from a tool response? I’m reviewing the call transcript, and although the tool call is successful, I can’t see the data that Vapi received from the webhook response. https://cdn.discordapp.com/attachments/1460701116185448459/1460859748755706011/image.png?ex=697ae829&is=697996a9&hm=db0555516f7c42a984e0b6f972595af7c3623d45a12344c869acf30a5d9d1bdf&

@hamza-007 execute the Test opotion on the tool https://cdn.discordapp.com/attachments/1460701116185448459/1461032923838021930/imageasdfasdfasdf.jpg?ex=697ae0b1&is=69798f31&hm=5f7eee53134d5e3c988eca45a7f78dc55bf6f742f1c3c06a1804245ac88f6623&

@GeraDeluxer I’m trying to understand how the tool test works. The status shows “OK,” but I couldn’t add anything to the request body since it was auto‑generated from variables. How should I use it? Do I need to set the ZIP code in the request body myself? I wasn’t able to add anything manually to the request body. https://cdn.discordapp.com/attachments/1460701116185448459/1461064877849182219/image.png?ex=697a55b4&is=69790434&hm=53cafcc063063bd6bdfa005ca2ccc5b85aaf69dd9adf2b52ff58165f850df911&

For testing purposes, set values in the default value field https://cdn.discordapp.com/attachments/1460701116185448459/1461115136713555988/image.png?ex=697a8482&is=69793302&hm=f727ea2944f8b4dedc06da0b4f203968822319d4b0fd9969dedbb644eff3f24b&

@GeraDeluxer There is no default value field here? https://cdn.discordapp.com/attachments/1460701116185448459/1461418638970982544/image.png?ex=697a4dab&is=6978fc2b&hm=52305f4e25b6cf99d152ee19b9440151912da649f5f19852287226da713a63aa&

Use API Request-type tool instead of custom tool.

The test tool only uses default values and it duplicates the first value for each type into the rest. This is only to verify that the tool is able to send to the webhook then receive a response. Like GeraDeluxer said, use the API request tool to configure this and you will be able to configure default values for your tool. If you need further assistance, let me know and we'll get it sorted

im trying to use the test tool, I have added defaults, it just sends an empty request

"type": "function",
  "function": {
    "name": "check_ltv",
    "description": "this tool sends the loan amount, the home value and the desired cashout and returns the LTV",
    "parameters": {
      "type": "object",
      "properties": {
        "Home_Value_Num": {
          "description": "the amount of dollars the contact thinks his home is worth",
          "type": "number",
          "default": "12"
        },
        "Loan_Amount_Num": {
          "description": "the amount of dollars the contacts current mortgage or loan is for",
          "type": "number",
          "default": "14"
        },
        "Desired_Cashout_Amount": {
          "description": "how many dollars is the contact looking to cashout?",
          "type": "number",
          "default": "14"
        }
      },
      "required": [
        "Home_Value_Num",
        "Loan_Amount_Num",
        "Desired_Cashout_Amount"
      ]
    }
  },

please provide a log of the empty request and we will investigate the issue