NASA-MCP

Instructions

Implementation Reference

• src/nasa_mcp/server.py:531-563 (handler)

  The handler function for the 'get_magnetopause_crossing' tool. It queries the NASA DONKI/MPC endpoint, handles the response, and formats the results using the shared format_donki_results helper. Decorated with @mcp.tool() for automatic registration.
  async def get_magnetopause_crossing(start_date: str = None, end_date: str = None) -> str: """Get magnetopause crossing (MPC) data. Args: start_date: Start date in YYYY-MM-DD format. Defaults to 30 days before current date. end_date: End date in YYYY-MM-DD format. Defaults to current date. """ params = {} if start_date: params["startDate"] = start_date if end_date: params["endDate"] = end_date url = f"{NASA_API_BASE}/DONKI/MPC" data = await make_nasa_request(url, params) if not data: return "Could not retrieve MPC 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 MPC API. URL: {data.get('url')}" try: # Ensure data is a list for format_donki_results if not isinstance(data, list): logger.error(f"Unexpected non-list response from MPC API: {data}") return "Received unexpected data format from MPC API." return format_donki_results(data, "Magnetopause Crossings", "mpcID") except Exception as e: logger.error(f"Error processing MPC data: {str(e)}") return f"Error processing magnetopause crossing data: {str(e)}"
• src/nasa_mcp/server.py:318-365 (helper)

  Shared helper function used by multiple DONKI tools, including get_magnetopause_crossing, to format and limit the display of API results.
  def format_donki_results(data: list, title_prefix: str, id_key: str) -> str: if not data: return f"No {title_prefix.lower()} data for the specified period." result = [f"{title_prefix} found: {len(data)}"] display_limit = 10 count = 0 for item in data: if count >= display_limit: result.append(f"n... and {len(data) - display_limit} more entries.") break result.append(f"nID: {item.get(id_key, 'Unknown')}") # Add common fields if they exist if 'startTime' in item: result.append(f"Start Time: {item.get('startTime', 'Unknown')}") if 'eventTime' in item: result.append(f"Event Time: {item.get('eventTime', 'Unknown')}") if 'sourceLocation' in item: result.append(f"Source Location: {item.get('sourceLocation', 'Unknown')}") if 'note' in item: result.append(f"Note: {item.get('note', 'N/A')}") if 'link' in item: result.append(f"Link: {item.get('link', 'N/A')}") # Specific fields for different DONKI types can be added here if needed # Example for CME: if id_key == 'activityID' and 'cmeAnalyses' in item: analyses = item.get('cmeAnalyses', []) if analyses: result.append(" Analyses:") for analysis in analyses[:2]: # Limit analyses shown result.append(f" - Time: {analysis.get('time21_5', 'N/A')}, Speed: {analysis.get('speed', 'N/A')} km/s, Type: {analysis.get('type', 'N/A')}") # Example for GST: if id_key == 'gstID' and 'allKpIndex' in item: kp_indices = item.get('allKpIndex', []) if kp_indices: result.append(" Kp Indices (first 2):") for kp in kp_indices[:2]: result.append(f" - Time: {kp.get('observedTime', 'N/A')}, Index: {kp.get('kpIndex', 'N/A')}") # Linked Events linked_events = item.get('linkedEvents', []) if linked_events: result.append(" Related event IDs (first 5):") result.append(" " + ", ".join([le.get('activityID', 'N/A') for le in linked_events[:5]])) result.append("-" * 40) count += 1 return "n".join(result)
• src/nasa_mcp/server.py:28-83 (helper)

  General helper function used by all NASA API tools, including get_magnetopause_crossing, to make HTTP requests and handle responses appropriately.
  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)}