GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/shapely_functions.py:406-419 (handler)

  The handler function that implements the get_length tool logic, using Shapely to compute the length of a WKT geometry and return it in a standardized dict format. The @gis_mcp.tool() decorator registers it as an MCP tool.

  @gis_mcp.tool()
  def get_length(geometry: str) -> Dict[str, Any]:
      """Get the length of a geometry."""
      try:
          from shapely import wkt
          geom = wkt.loads(geometry)
          return {
              "status": "success",
              "length": float(geom.length),
              "message": "Length calculated successfully"
          }
      except Exception as e:
          logger.error(f"Error calculating length: {str(e)}")
          raise ValueError(f"Failed to calculate length: {str(e)}")

• src/gis_mcp/shapely_functions.py:61-69 (helper)

  Resource handler that lists 'get_length' among available measurement operations for discovery.

  @gis_mcp.resource("gis://operations/measurements")
  def get_measurements() -> Dict[str, List[str]]:
      """List available measurement operations."""
      return {
          "operations": [
              "get_length",
              "get_area"
          ]
      }