MongoDB MCP Server

Instructions

Implementation Reference

• src/index.ts:1216-1239 (handler)

  Handler for 'get_indexes' tool: connects to the specified database, retrieves the indexes for the given collection using MongoDB's indexes() method, and returns the results as formatted JSON text content.

  case 'get_indexes': {
    const { database, collection } = request.params.arguments as {
      database?: string;
      collection: string;
    };
    const dbName = database || this.defaultDatabase;
    if (!dbName) {
      throw new McpError(
        ErrorCode.InvalidRequest,
        'Database name is required when no default database is configured'
      );
    }
  
    const db = client.db(dbName);
    const indexes = await db.collection(collection).indexes();
    return {
      content: [
        {
          type: 'text',
          text: JSON.stringify(indexes, null, 2),
        },
      ],
    };
  }

• src/index.ts:576-598 (registration)

  Registration of the 'get_indexes' tool in the list_tools response, including name, description, and input schema definition.

            name: 'get_indexes',
            description: `Get information about indexes on a collection.
  
  Returns details about:
  - Index names and fields
  - Index types (single field, compound, text, etc.)
  - Index sizes
  - Index options
  - Usage statistics`,
            inputSchema: {
              type: 'object',
              properties: {
                database: {
                  type: 'string',
                  description: 'Database name (optional if default database is configured)',
                },
                collection: {
                  type: 'string',
                  description: 'Collection name',
                },
              },
              required: ['collection'],
            },

• src/index.ts:576-598 (schema)

  Input schema definition for the 'get_indexes' tool, specifying parameters for database (optional) and required collection name.

            name: 'get_indexes',
            description: `Get information about indexes on a collection.
  
  Returns details about:
  - Index names and fields
  - Index types (single field, compound, text, etc.)
  - Index sizes
  - Index options
  - Usage statistics`,
            inputSchema: {
              type: 'object',
              properties: {
                database: {
                  type: 'string',
                  description: 'Database name (optional if default database is configured)',
                },
                collection: {
                  type: 'string',
                  description: 'Collection name',
                },
              },
              required: ['collection'],
            },