GIS Data Conversion MCP

Instructions

Implementation Reference

• src/index.ts:346-373 (handler)

  The main handler function for the 'geojson_to_wkt' tool. It validates input, uses the 'wellknown' library to convert GeoJSON to WKT, handles errors, and returns a formatted tool response.

  async geoJSONToWKT(args: any): Promise<ToolResponse> {
    const { geojson } = args;
  
    if (!geojson) {
      throw new McpError(
        ErrorCode.InvalidParams,
        'Missing required parameter: geojson'
      );
    }
  
    try {
      console.error(`[Converting] GeoJSON to WKT: ${JSON.stringify(geojson).substring(0, 50)}...`);
      
      const wkt = wellknown.stringify(geojson);
      
      if (!wkt) {
        throw new Error('Failed to convert GeoJSON to WKT');
      }
      
      return this.formatToolResponse(wkt);
    } catch (error) {
      console.error('[Error] GeoJSON to WKT conversion failed:', error);
      throw new McpError(
        ErrorCode.InternalError,
        `GeoJSON to WKT conversion failed: ${error instanceof Error ? error.message : String(error)}`
      );
    }
  }

• src/index.ts:105-118 (registration)

  The tool registration entry in the ListTools response, defining the name, description, and input schema for 'geojson_to_wkt'.

  {
    name: 'geojson_to_wkt',
    description: 'Convert GeoJSON to Well-Known Text (WKT) format',
    inputSchema: {
      type: 'object',
      properties: {
        geojson: {
          type: 'object',
          description: 'GeoJSON object to convert',
        },
      },
      required: ['geojson'],
    },
  },

• src/index.ts:108-117 (schema)

  The input schema for the 'geojson_to_wkt' tool, specifying that a 'geojson' object is required.

  inputSchema: {
    type: 'object',
    properties: {
      geojson: {
        type: 'object',
        description: 'GeoJSON object to convert',
      },
    },
    required: ['geojson'],
  },

• src/index.ts:282-283 (handler)

  The switch case in the CallToolRequest handler that routes calls to the geoJSONToWKT method.

  case 'geojson_to_wkt':
    return await this.geoJSONToWKT(request.params.arguments);