MCP-MongoDB-MySQL-Server

Instructions

Implementation Reference

• src/index.ts:1036-1067 (handler)

  The handler function that executes the MongoDB update operation. Ensures MongoDB connection, validates arguments, performs updateOne or updateMany based on the 'many' flag, and returns the result.

  private async handleMongoDBUpdate(args: any) {
    await this.ensureMongoConnection();
  
    if (!args.collection || !args.filter || !args.update) {
      throw new McpError(ErrorCode.InvalidParams, 'Collection name, filter, and update are required');
    }
  
    try {
      const collection = this.mongoDB!.collection(args.collection);
      let result;
      
      if (args.many) {
        result = await collection.updateMany(args.filter, args.update);
      } else {
        result = await collection.updateOne(args.filter, args.update);
      }
      
      return {
        content: [
          {
            type: 'text',
            text: `Successfully updated ${result.modifiedCount} documents`,
          },
        ],
      };
    } catch (error) {
      throw new McpError(
        ErrorCode.InternalError,
        `Failed to update documents: ${getErrorMessage(error)}`
      );
    }
  }

• src/index.ts:466-488 (schema)

  Input schema for the mongodb_update tool, defining required properties: collection, filter, update, and optional many boolean.

  inputSchema: {
    type: 'object',
    properties: {
      collection: {
        type: 'string',
        description: 'Collection name',
      },
      filter: {
        type: 'object',
        description: 'MongoDB query filter',
      },
      update: {
        type: 'object',
        description: 'MongoDB update operations',
      },
      many: {
        type: 'boolean',
        description: 'Update multiple documents if true',
        optional: true
      }
    },
    required: ['collection', 'filter', 'update'],
  },

• src/index.ts:463-489 (registration)

  Registration of the mongodb_update tool in the list of tools returned by ListToolsRequest, including name, description, and input schema.

  {
    name: 'mongodb_update',
    description: 'Update documents in a MongoDB collection',
    inputSchema: {
      type: 'object',
      properties: {
        collection: {
          type: 'string',
          description: 'Collection name',
        },
        filter: {
          type: 'object',
          description: 'MongoDB query filter',
        },
        update: {
          type: 'object',
          description: 'MongoDB update operations',
        },
        many: {
          type: 'boolean',
          description: 'Update multiple documents if true',
          optional: true
        }
      },
      required: ['collection', 'filter', 'update'],
    },
  },

• src/index.ts:560-561 (registration)

  Dispatch registration in the CallToolRequest handler switch statement, routing calls to the handleMongoDBUpdate method.

  case 'mongodb_update':
    return await this.handleMongoDBUpdate(request.params.arguments);