GIS MCP Server

Instructions

Implementation Reference

• src/gis_mcp/shapely_functions.py:96-119 (handler)

  The handler function for the 'buffer' MCP tool. It takes WKT geometry string, distance, and buffer parameters, uses Shapely to create a buffer, and returns the resulting WKT geometry in a success dict or raises error.

  @gis_mcp.tool()
  def buffer(geometry: str, distance: float, resolution: int = 16, 
          join_style: int = 1, mitre_limit: float = 5.0, 
          single_sided: bool = False) -> Dict[str, Any]:
      """Create a buffer around a geometry."""
      try:
          from shapely import wkt
          geom = wkt.loads(geometry)
          buffered = geom.buffer(
              distance=distance,
              resolution=resolution,
              join_style=join_style,
              mitre_limit=mitre_limit,
              single_sided=single_sided
          )
          return {
              "status": "success",
              "geometry": buffered.wkt,
              "message": "Buffer created successfully"
          }
      except Exception as e:
          logger.error(f"Error creating buffer: {str(e)}")
          raise ValueError(f"Failed to create buffer: {str(e)}")

• src/gis_mcp/shapely_functions.py:97-99 (schema)

  Function signature providing input schema via type hints (geometry: str WKT, distance: float, etc.) and output as Dict[str, Any], with docstring description.

  def buffer(geometry: str, distance: float, resolution: int = 16, 
          join_style: int = 1, mitre_limit: float = 5.0, 
          single_sided: bool = False) -> Dict[str, Any]:

• src/gis_mcp/shapely_functions.py:96-96 (registration)

  The @gis_mcp.tool() decorator registers this function as the MCP tool named 'buffer'.

  @gis_mcp.tool()