DynamoDB Read-Only MCP

Instructions

Implementation Reference

• src/index.ts:22-45 (registration)

  Registration of the 'list-tables' tool, including inline handler that invokes listTables helper, formats the response as text content, and handles errors.

  server.tool('list-tables', 'Get a list of all DynamoDB tables', {}, async () => {
    try {
      console.error('# list-tables tool has been called');
      const tables = await listTables();
      return {
        content: [
          {
            type: 'text',
            text: JSON.stringify(tables, null, 2),
          },
        ],
      };
    } catch (error: any) {
      return {
        isError: true,
        content: [
          {
            type: 'text',
            text: `Error occurred: ${error.message}`,
          },
        ],
      };
    }
  });

• src/dynamo-helpers.ts:7-19 (handler)

  Core handler logic for listing DynamoDB tables using ListTablesCommand on the DynamoDB client.

  export async function listTables() {
    console.error('# Starting listTables function');
    try {
      const command = new ListTablesCommand({});
      console.error('# ListTables command created successfully');
      const response = await dynamodb.send(command);
      console.error('# ListTables response received:', response);
      return response.TableNames || [];
    } catch (error) {
      console.error('# Error in listTables function:', error);
      throw error;
    }
  }