GIS Data Conversion MCP

Instructions

Implementation Reference

• src/index.ts:317-344 (handler)

  The main handler function for the 'wkt_to_geojson' tool. Parses WKT string using the 'wellknown' library and returns the resulting GeoJSON as a formatted JSON string.

  async wktToGeoJSON(args: any): Promise<ToolResponse> {
    const { wkt } = args;
  
    if (!wkt) {
      throw new McpError(
        ErrorCode.InvalidParams,
        'Missing required parameter: wkt'
      );
    }
  
    try {
      console.error(`[Converting] WKT to GeoJSON: "${wkt.substring(0, 50)}${wkt.length > 50 ? '...' : ''}"`);
      
      const geojson = wellknown.parse(wkt);
      
      if (!geojson) {
        throw new Error('Failed to parse WKT string');
      }
      
      return this.formatToolResponse(JSON.stringify(geojson, null, 2));
    } catch (error) {
      console.error('[Error] WKT to GeoJSON conversion failed:', error);
      throw new McpError(
        ErrorCode.InternalError,
        `WKT to GeoJSON conversion failed: ${error instanceof Error ? error.message : String(error)}`
      );
    }
  }

• src/index.ts:92-104 (schema)

  Defines the input schema and metadata for the 'wkt_to_geojson' tool in the ListTools response.

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

• src/index.ts:280-281 (registration)

  Registers the tool dispatch in the CallToolRequestSchema handler by routing calls to the wktToGeoJSON method.

  case 'wkt_to_geojson':
    return await this.wktToGeoJSON(request.params.arguments);

• src/index.ts:63-72 (helper)

  Helper method used by the handler to format the GeoJSON response according to MCP ToolResponse type.

  private formatToolResponse(text: string): ToolResponse {
    return {
      content: [
        {
          type: 'text',
          text
        },
      ],
    };
  }