GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/shapely_functions.py:317-334 (handler)

  The main execution logic for the 'scale_geometry' tool. Parses WKT input, applies shapely.affinity.scale with xfact, yfact, and origin parameters, returns scaled geometry as WKT.

  @gis_mcp.tool()
  def scale_geometry(geometry: str, xfact: float, yfact: float, 
                  origin: str = "center") -> Dict[str, Any]:
      """Scale a geometry."""
      try:
          from shapely import wkt
          from shapely.affinity import scale
          geom = wkt.loads(geometry)
          result = scale(geom, xfact=xfact, yfact=yfact, origin=origin)
          return {
              "status": "success",
              "geometry": result.wkt,
              "message": "Geometry scaled successfully"
          }
      except Exception as e:
          logger.error(f"Error scaling geometry: {str(e)}")
          raise ValueError(f"Failed to scale geometry: {str(e)}")

• src/gis_mcp/shapely_functions.py:39-48 (registration)

  Resource endpoint listing available transformation tools, including 'scale_geometry'.

  @gis_mcp.resource("gis://operations/transformations")
  def get_transformations() -> Dict[str, List[str]]:
      """List available geometric transformations."""
      return {
          "operations": [
              "rotate_geometry",
              "scale_geometry",
              "translate_geometry"
          ]
      }

• src/gis_mcp/shapely_functions.py:318-319 (schema)

  Function signature defining input schema (geometry: str WKT, xfact/yfact: float scaling factors, origin: str='center') and output (Dict with status, geometry WKT, message).

  def scale_geometry(geometry: str, xfact: float, yfact: float, 
                  origin: str = "center") -> Dict[str, Any]: