{
  "tools": [
    {
      "name": "calculator",
      "description": "Perform basic math operations (add, subtract, multiply, divide)",
      "inputSchema": {
        "type": "object",
        "properties": {
          "a": {
            "type": "number"
          },
          "b": {
            "type": "number"
          },
          "operation": {
            "type": "string",
            "default": "add"
          }
        },
        "required": [
          "a",
          "b"
        ]
      }
    },
    {
      "name": "send_welcome",
      "description": "Sends a welcome message to a user.",
      "inputSchema": {
        "type": "object",
        "properties": {
          "userId": {
            "type": "string",
            "description": "the ID of the user to message"
          },
          "customMessage": {
            "type": [
              "null",
              "string"
            ],
            "description": "an optional custom message part",
            "default": null
          }
        },
        "required": [
          "userId"
        ]
      }
    },
    {
      "name": "test_tool_without_params",
      "inputSchema": {
        "type": "object",
        "properties": {}
      }
    }
  ]
}