MCP-MongoDB-MySQL-Server

Instructions

Implementation Reference

• src/index.ts:956-975 (handler)

  The handler function that executes the mongodb_list_collections tool. Ensures MongoDB connection, lists collections using listCollections().toArray(), and returns JSON-formatted list.

  private async handleMongoDBListCollections() {
    await this.ensureMongoConnection();
  
    try {
      const collections = await this.mongoDB!.listCollections().toArray();
      return {
        content: [
          {
            type: 'text',
            text: JSON.stringify(collections, null, 2),
          },
        ],
      };
    } catch (error) {
      throw new McpError(
        ErrorCode.InternalError,
        `Failed to list collections: ${getErrorMessage(error)}`
      );
    }
  }

• src/index.ts:399-407 (registration)

  Tool registration in the listTools handler, defining name, description, and empty input schema (no parameters required).

  {
    name: 'mongodb_list_collections',
    description: 'List all collections in the MongoDB database',
    inputSchema: {
      type: 'object',
      properties: {},
      required: [],
    },
  },

• src/index.ts:554-555 (registration)

  Dispatcher case in CallToolRequestHandler that routes calls to the handleMongoDBListCollections method.

  case 'mongodb_list_collections':
    return await this.handleMongoDBListCollections();

• src/index.ts:402-407 (schema)

  Input schema definition for the tool: empty object with no required properties.

    inputSchema: {
      type: 'object',
      properties: {},
      required: [],
    },
  },