NASA-MCP

Instructions

Implementation Reference

• src/nasa_mcp/server.py:153-209 (handler)

  The handler function for the 'get_asteroids_feed' tool. It is decorated with @mcp.tool() for registration and implements the logic to fetch and format asteroid near-Earth object feed data from NASA's API using start_date and optional end_date parameters.
  @mcp.tool() async def get_asteroids_feed(start_date: str, end_date: str = None) -> str: """Get a list of asteroids based on their closest approach date to Earth. Args: start_date: Start date for asteroid search in YYYY-MM-DD format. end_date: End date for asteroid search in YYYY-MM-DD format. The Feed date limit is only 7 Days. If not specified, 7 days after start_date is used. """ params = { "start_date": start_date } if end_date: params["end_date"] = end_date url = f"{NASA_API_BASE}/neo/rest/v1/feed" data = await make_nasa_request(url, params) if not data: return "Could not retrieve asteroid data due to a connection error." # Check for error response (must be a dictionary) if isinstance(data, dict) and "error" in data: return f"API Error: {data.get('error')} - Details: {data.get('details', 'N/A')}" if isinstance(data, dict) and data.get("binary_content"): return f"Received unexpected binary content from Asteroids Feed API. URL: {data.get('url')}" try: element_count = data.get('element_count', 0) near_earth_objects = data.get('near_earth_objects', {}) result = [f"Total asteroids found: {element_count}"] for date_str, asteroids in near_earth_objects.items(): result.append(f"nDate: {date_str}") result.append(f"Number of asteroids: {len(asteroids)}") for asteroid in asteroids: result.append(f"n ID: {asteroid.get('id', 'Unknown')}") result.append(f" Name: {asteroid.get('name', 'Unknown')}") result.append(f" Estimated diameter (min): {asteroid.get('estimated_diameter', {}).get('kilometers', {}).get('estimated_diameter_min', 'Unknown')} km") result.append(f" Estimated diameter (max): {asteroid.get('estimated_diameter', {}).get('kilometers', {}).get('estimated_diameter_max', 'Unknown')} km") result.append(f" Potentially hazardous: {'Yes' if asteroid.get('is_potentially_hazardous_asteroid', False) else 'No'}") # Information about closest approach close_approaches = asteroid.get('close_approach_data', []) if close_approaches: approach = close_approaches[0] result.append(f" Approach date: {approach.get('close_approach_date_full', 'Unknown')}") result.append(f" Distance (km): {approach.get('miss_distance', {}).get('kilometers', 'Unknown')}") result.append(f" Relative velocity (km/h): {approach.get('relative_velocity', {}).get('kilometers_per_hour', 'Unknown')}") return "n".join(result) except Exception as e: logger.error(f"Error processing Asteroids Feed data: {str(e)}") return f"Error processing asteroid data: {str(e)}"
• src/nasa_mcp/server.py:28-83 (helper)

  Shared helper function used by get_asteroids_feed (and other tools) to make HTTP requests to NASA APIs, handle JSON/binary responses, errors, and add API key.
  async def make_nasa_request(url: str, params: dict = None) -> Union[dict[str, Any], List[Any], None]: """Make a request to the NASA API with proper error handling. Handles both JSON and binary (image) responses. """ logger.info(f"Making request to: {url} with params: {params}") if params is None: params = {} # Ensure API key is included in parameters if "api_key" not in params: params["api_key"] = API_KEY async with httpx.AsyncClient() as client: try: response = await client.get(url, params=params, timeout=30.0, follow_redirects=True) response.raise_for_status() # Raise an exception for bad status codes (4xx or 5xx) content_type = response.headers.get("Content-Type", "").lower() if "application/json" in content_type: try: return response.json() except json.JSONDecodeError as json_err: logger.error(f"JSON decode error for URL {response.url}: {json_err}") logger.error(f"Response text: {response.text[:500]}") # Log beginning of text return {"error": "Failed to decode JSON response", "details": str(json_err)} elif content_type.startswith("image/"): logger.info(f"Received binary image content ({content_type}) from {response.url}") # Return a dictionary indicating binary content was received return { "binary_content": True, "content_type": content_type, "url": str(response.url) # Return the final URL after redirects } else: # Handle other unexpected content types logger.warning(f"Unexpected content type '{content_type}' received from {response.url}") return {"error": f"Unexpected content type: {content_type}", "content": response.text[:500]} except httpx.HTTPStatusError as http_err: logger.error(f"HTTP error occurred: {http_err} - {http_err.response.status_code} for URL {http_err.request.url}") try: # Try to get more details from response body if possible error_details = http_err.response.json() except Exception: error_details = http_err.response.text[:500] return {"error": f"HTTP error: {http_err.response.status_code}", "details": error_details} except httpx.RequestError as req_err: logger.error(f"Request error occurred: {req_err} for URL {req_err.request.url}") return {"error": "Request failed", "details": str(req_err)} except Exception as e: logger.error(f"An unexpected error occurred: {str(e)}") return {"error": "An unexpected error occurred", "details": str(e)}