Desk3 MCP Server

Instructions

Implementation Reference

• src/desk3_service/server.py:110-119 (handler)

  Core handler function implementing the get_fear_greed_index tool logic by calling the external API endpoint.

  async def get_fear_greed_index() -> dict[str, Any]:
      """
      Get crypto fear and greed index。
      :return: index
      """
      url = 'https://mcp.desk3.io/v1/market/fear-greed'
      try:
          return request_api('get', url)
      except Exception as e:
          raise RuntimeError(f"Failed to fetch fear & greed index: {e}")

• src/desk3_service/server.py:591-599 (registration)

  Registration of the get_fear_greed_index tool in the list_tools handler, including schema (no input params required).

  types.Tool(
      name="get_fear_greed_index",
      description="Discover our Fear and Greed Index, a powerful tool that analyzes market sentiment to help you make informed crypto investment decisions. Stay ahead of market trends with real-time and historical data available through our easy-to-use API",
      inputSchema={
          "type": "object",
          "properties": {},
          "required": [],
      },
  ),

• src/desk3_service/server.py:773-783 (handler)

  MCP tool call handler dispatch case that executes get_fear_greed_index and returns JSON response.

  case "get_fear_greed_index":
      try:
          data = await get_fear_greed_index()
          return [
              types.TextContent(
                  type="text",
                  text=json.dumps(data, indent=2),
              )
          ]
      except Exception as e:
          raise RuntimeError(f"Failed to fetch fear & greed index: {e}")

• src/desk3_service/server.py:594-598 (schema)

  JSON schema for tool inputs (empty, no parameters required).

  inputSchema={
      "type": "object",
      "properties": {},
      "required": [],
  },

• src/desk3_service/server.py:23-41 (helper)

  Helper function used by get_fear_greed_index to make authenticated API requests.

  def request_api(method: str, url: str, params: dict = None, data: dict = None) -> any:
      headers = {
          'Accepts': 'application/json',
          'X-DESK3_PRO_API_KEY': API_KEY,
      }
      try:
          logging.info(f"Requesting {method.upper()} {url} params={params} data={data}")
          if method.lower() == 'get':
              response = requests.get(url, headers=headers, params=params)
          elif method.lower() == 'post':
              response = requests.post(url, headers=headers, json=data)
          else:
              raise ValueError(f"Unsupported HTTP method: {method}")
          response.raise_for_status()
          logging.info(f"Response {response.status_code} for {url}")
          return json.loads(response.text)
      except Exception as e:
          logging.error(f"Error during {method.upper()} {url}: {e}")
          raise