GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/pyproj_functions.py:44-62 (handler)

  The primary handler function for the 'transform_coordinates' tool. It takes a list of two floats (x,y), source CRS, and target CRS, uses pyproj.Transformer to perform the transformation, and returns a success dict with transformed coordinates or raises an error.
  @gis_mcp.tool() def transform_coordinates(coordinates: List[float], source_crs: str, target_crs: str) -> Dict[str, Any]: """Transform coordinates between CRS.""" try: from pyproj import Transformer transformer = Transformer.from_crs(source_crs, target_crs, always_xy=True) x, y = coordinates x_transformed, y_transformed = transformer.transform(x, y) return { "status": "success", "coordinates": [x_transformed, y_transformed], "source_crs": source_crs, "target_crs": target_crs, "message": "Coordinates transformed successfully" } except Exception as e: logger.error(f"Error transforming coordinates: {str(e)}") raise ValueError(f"Failed to transform coordinates: {str(e)}")
• src/gis_mcp/pyproj_functions.py:9-17 (registration)

  MCP resource that registers and lists 'transform_coordinates' as an available operation under CRS transformations for tool discovery.
  @gis_mcp.resource("gis://crs/transformations") def get_crs_transformations() -> Dict[str, List[str]]: """List available CRS transformation operations.""" return { "operations": [ "transform_coordinates", "project_geometry" ] }
• src/gis_mcp/pyproj_functions.py:45-46 (schema)

  Function signature defining the input schema (coordinates: List[float], source_crs: str, target_crs: str) and output (Dict[str, Any]) for the tool.
  def transform_coordinates(coordinates: List[float], source_crs: str, target_crs: str) -> Dict[str, Any]: