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ambit1977

Google Tag Manager MCP Server

by ambit1977

list_variables

Retrieve all variables from a Google Tag Manager workspace to manage tracking configurations and data collection settings.

Instructions

指定されたワークスペースの変数一覧を取得します

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
accountIdYesアカウントID
containerIdYesコンテナID
workspaceIdYesワークスペースID

Implementation Reference

  • MCP tool handler in the CallToolRequestSchema switch statement. Calls gtmClient.listVariables with accountId, containerId, workspaceId and returns the result as JSON text content.
    case 'list_variables':
      return {
        content: [
          {
            type: 'text',
            text: JSON.stringify(
              await this.gtmClient.listVariables(
                args.accountId,
                args.containerId,
                args.workspaceId
              ),
              null,
              2
            ),
          },
        ],
      };
  • Input schema definition for the list_variables tool, requiring accountId, containerId, and workspaceId. Part of the tool list in ListToolsRequestSchema handler.
      name: 'list_variables',
      description: '指定されたワークスペースの変数一覧を取得します',
      inputSchema: {
        type: 'object',
        properties: {
          accountId: {
            type: 'string',
            description: 'アカウントID',
          },
          containerId: {
            type: 'string',
            description: 'コンテナID',
          },
          workspaceId: {
            type: 'string',
            description: 'ワークスペースID',
          },
        },
        required: ['accountId', 'containerId', 'workspaceId'],
      },
    },
  • src/index.js:34-858 (registration)
    Tool registration via the ListToolsRequestSchema handler, which lists all available tools including list_variables with its schema.
    this.server.setRequestHandler(ListToolsRequestSchema, async () => ({
      tools: [
        {
          name: 'get_auth_url',
          description: 'OAuth2認証URLを取得します。このURLにアクセスして認証を完了してください。',
          inputSchema: {
            type: 'object',
            properties: {},
          },
        },
        {
          name: 'authenticate',
          description: '認証コードを使用して認証を完了します。get_auth_urlで取得したURLにアクセスし、リダイレクト先のURLから認証コードを取得して使用してください。',
          inputSchema: {
            type: 'object',
            properties: {
              code: {
                type: 'string',
                description: 'OAuth2認証コード(リダイレクト先のURLの「code=」の後の値)',
              },
            },
            required: ['code'],
          },
        },
        {
          name: 'check_auth_status',
          description: '現在の認証状態を確認します',
          inputSchema: {
            type: 'object',
            properties: {},
          },
        },
        {
          name: 'reset_auth',
          description: '保存された認証情報をリセットします',
          inputSchema: {
            type: 'object',
            properties: {},
          },
        },
        {
          name: 'list_accounts',
          description: 'Google Tag Managerのアカウント一覧を取得します',
          inputSchema: {
            type: 'object',
            properties: {},
          },
        },
        {
          name: 'list_containers',
          description: '指定されたアカウントのコンテナ一覧を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
            },
            required: ['accountId'],
          },
        },
        {
          name: 'get_container',
          description: '指定されたコンテナの詳細を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
            },
            required: ['accountId', 'containerId'],
          },
        },
        {
          name: 'create_container',
          description: '新しいコンテナを作成します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              name: {
                type: 'string',
                description: 'コンテナ名',
              },
              usageContext: {
                type: 'array',
                items: {
                  type: 'string',
                  enum: ['web', 'android', 'ios', 'amp'],
                },
                description: '使用コンテキスト(例: ["web"])',
              },
            },
            required: ['accountId', 'name', 'usageContext'],
          },
        },
        {
          name: 'list_workspaces',
          description: '指定されたコンテナのワークスペース一覧を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
            },
            required: ['accountId', 'containerId'],
          },
        },
        {
          name: 'get_workspace',
          description: '指定されたワークスペースの詳細を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId'],
          },
        },
        {
          name: 'list_tags',
          description: '指定されたワークスペースのタグ一覧を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId'],
          },
        },
        {
          name: 'get_tag',
          description: '指定されたタグの詳細を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              tagId: {
                type: 'string',
                description: 'タグID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'tagId'],
          },
        },
        {
          name: 'create_tag',
          description: '新しいタグを作成します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              name: {
                type: 'string',
                description: 'タグ名',
              },
              type: {
                type: 'string',
                description: 'タグタイプ(例: "googtag"=GA4設定, "gaawe"=GA4イベント, "awct"=Google広告コンバージョン, "html"=カスタムHTML, "img"=カスタム画像, "fbq"=Facebookピクセル, "ua"=Universal Analyticsなど)',
              },
              parameter: {
                type: 'array',
                description: 'タグのパラメータ配列',
                items: {
                  type: 'object',
                  properties: {
                    type: {
                      type: 'string',
                      description: 'パラメータタイプ',
                    },
                    key: {
                      type: 'string',
                      description: 'パラメータキー',
                    },
                    value: {
                      type: 'string',
                      description: 'パラメータ値',
                    },
                  },
                },
              },
              firingTriggerId: {
                type: 'array',
                items: {
                  type: 'string',
                },
                description: '発火トリガーIDの配列',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'name', 'type'],
          },
        },
        {
          name: 'update_tag',
          description: '既存のタグを更新します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              tagId: {
                type: 'string',
                description: 'タグID',
              },
              name: {
                type: 'string',
                description: 'タグ名',
              },
              type: {
                type: 'string',
                description: 'タグタイプ',
              },
              parameter: {
                type: 'array',
                description: 'タグのパラメータ配列',
              },
              firingTriggerId: {
                type: 'array',
                items: {
                  type: 'string',
                },
                description: '発火トリガーIDの配列',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'tagId'],
          },
        },
        {
          name: 'delete_tag',
          description: 'タグを削除します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              tagId: {
                type: 'string',
                description: 'タグID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'tagId'],
          },
        },
        {
          name: 'list_triggers',
          description: '指定されたワークスペースのトリガー一覧を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId'],
          },
        },
        {
          name: 'get_trigger',
          description: '指定されたトリガーの詳細を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              triggerId: {
                type: 'string',
                description: 'トリガーID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'triggerId'],
          },
        },
        {
          name: 'update_trigger',
          description: '既存のトリガーを更新します。filter、autoEventFilter、waitForTagsなどのすべての設定を更新できます。',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              triggerId: {
                type: 'string',
                description: 'トリガーID',
              },
              name: {
                type: 'string',
                description: 'トリガー名',
              },
              type: {
                type: 'string',
                description: 'トリガータイプ',
              },
              customEventFilter: {
                type: 'array',
                description: 'カスタムイベントフィルタ(CUSTOM_EVENTタイプ用)',
              },
              filter: {
                type: 'array',
                description: 'フィルタ(linkClick、clickなどのタイプ用)',
              },
              autoEventFilter: {
                type: 'array',
                description: '自動イベントフィルタ(linkClickタイプ用)',
              },
              waitForTags: {
                type: 'boolean',
                description: 'タグの待機を有効化(linkClickタイプ用)',
              },
              checkValidation: {
                type: 'boolean',
                description: 'バリデーションチェック(linkClickタイプ用)',
              },
              waitForTagsTimeout: {
                type: 'number',
                description: 'タグ待機タイムアウト(ミリ秒、linkClickタイプ用)',
              },
              // formSubmission用
              formId: {
                type: 'string',
                description: 'フォームID(formSubmissionタイプ用)',
              },
              formClasses: {
                type: 'string',
                description: 'フォームクラス(formSubmissionタイプ用)',
              },
              // scrollDepth用
              verticalThreshold: {
                type: 'number',
                description: '垂直スクロール閾値(パーセント、scrollDepthタイプ用)',
              },
              horizontalThreshold: {
                type: 'number',
                description: '水平スクロール閾値(パーセント、scrollDepthタイプ用)',
              },
              // elementVisibility用
              selector: {
                type: 'string',
                description: 'CSSセレクタ(elementVisibilityタイプ用)',
              },
              visiblePercentageThreshold: {
                type: 'number',
                description: '表示割合閾値(パーセント、elementVisibilityタイプ用)',
              },
              continuousTimeMinMilliseconds: {
                type: 'number',
                description: '連続表示時間(ミリ秒、elementVisibilityタイプ用)',
              },
              // youtubeVideo用
              videoId: {
                type: 'string',
                description: 'YouTube動画ID(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoStart: {
                type: 'boolean',
                description: '動画開始時に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoProgress: {
                type: 'boolean',
                description: '動画再生中に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoComplete: {
                type: 'boolean',
                description: '動画完了時に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoPause: {
                type: 'boolean',
                description: '動画一時停止時に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoSeek: {
                type: 'boolean',
                description: '動画シーク時に発火(youtubeVideoタイプ用)',
              },
              // timer用
              interval: {
                type: 'number',
                description: 'インターバル(ミリ秒、timerタイプ用)',
              },
              limit: {
                type: 'number',
                description: '発火回数の上限(timerタイプ用)',
              },
              startTimerOn: {
                type: 'string',
                description: 'タイマー開始タイミング(timerタイプ用、例: "windowLoad", "domReady")',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'triggerId'],
          },
        },
        {
          name: 'delete_trigger',
          description: 'トリガーを削除します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              triggerId: {
                type: 'string',
                description: 'トリガーID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'triggerId'],
          },
        },
        {
          name: 'create_trigger',
          description: '新しいトリガーを作成します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              name: {
                type: 'string',
                description: 'トリガー名',
              },
              type: {
                type: 'string',
                description: 'トリガータイプ(例: "PAGEVIEW", "CLICK", "CUSTOM_EVENT", "linkClick"など)',
              },
              customEventFilter: {
                type: 'array',
                description: 'カスタムイベントフィルタ(CUSTOM_EVENTタイプ用)',
              },
              filter: {
                type: 'array',
                description: 'フィルタ(linkClick、clickなどのタイプ用)',
              },
              autoEventFilter: {
                type: 'array',
                description: '自動イベントフィルタ(linkClickタイプ用)',
              },
              waitForTags: {
                type: 'boolean',
                description: 'タグの待機を有効化(linkClickタイプ用)',
              },
              checkValidation: {
                type: 'boolean',
                description: 'バリデーションチェック(linkClickタイプ用)',
              },
              waitForTagsTimeout: {
                type: 'number',
                description: 'タグ待機タイムアウト(ミリ秒、linkClickタイプ用)',
              },
              // formSubmission用
              formId: {
                type: 'string',
                description: 'フォームID(formSubmissionタイプ用)',
              },
              formClasses: {
                type: 'string',
                description: 'フォームクラス(formSubmissionタイプ用)',
              },
              // scrollDepth用
              verticalThreshold: {
                type: 'number',
                description: '垂直スクロール閾値(パーセント、scrollDepthタイプ用)',
              },
              horizontalThreshold: {
                type: 'number',
                description: '水平スクロール閾値(パーセント、scrollDepthタイプ用)',
              },
              // elementVisibility用
              selector: {
                type: 'string',
                description: 'CSSセレクタ(elementVisibilityタイプ用)',
              },
              visiblePercentageThreshold: {
                type: 'number',
                description: '表示割合閾値(パーセント、elementVisibilityタイプ用)',
              },
              continuousTimeMinMilliseconds: {
                type: 'number',
                description: '連続表示時間(ミリ秒、elementVisibilityタイプ用)',
              },
              // youtubeVideo用
              videoId: {
                type: 'string',
                description: 'YouTube動画ID(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoStart: {
                type: 'boolean',
                description: '動画開始時に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoProgress: {
                type: 'boolean',
                description: '動画再生中に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoComplete: {
                type: 'boolean',
                description: '動画完了時に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoPause: {
                type: 'boolean',
                description: '動画一時停止時に発火(youtubeVideoタイプ用)',
              },
              enableTriggerOnVideoSeek: {
                type: 'boolean',
                description: '動画シーク時に発火(youtubeVideoタイプ用)',
              },
              // timer用
              interval: {
                type: 'number',
                description: 'インターバル(ミリ秒、timerタイプ用)',
              },
              limit: {
                type: 'number',
                description: '発火回数の上限(timerタイプ用)',
              },
              startTimerOn: {
                type: 'string',
                description: 'タイマー開始タイミング(timerタイプ用、例: "windowLoad", "domReady")',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'name', 'type'],
          },
        },
        {
          name: 'list_variables',
          description: '指定されたワークスペースの変数一覧を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId'],
          },
        },
        {
          name: 'get_variable',
          description: '指定された変数の詳細を取得します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              variableId: {
                type: 'string',
                description: '変数ID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'variableId'],
          },
        },
        {
          name: 'create_variable',
          description: '新しい変数を作成します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              name: {
                type: 'string',
                description: '変数名',
              },
              type: {
                type: 'string',
                description: '変数タイプ(例: "c"=定数, "v"=データレイヤー, "j"=JavaScript, "d"=DOM要素, "k"=Cookie, "u"=URL, "ae"=自動イベント, "b"=組み込み変数など)',
              },
              parameter: {
                type: 'array',
                description: '変数のパラメータ配列。タイプに応じて必要なパラメータを設定してください。',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'name', 'type'],
          },
        },
        {
          name: 'update_variable',
          description: '既存の変数を更新します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              variableId: {
                type: 'string',
                description: '変数ID',
              },
              name: {
                type: 'string',
                description: '変数名',
              },
              type: {
                type: 'string',
                description: '変数タイプ',
              },
              parameter: {
                type: 'array',
                description: '変数のパラメータ配列',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'variableId'],
          },
        },
        {
          name: 'delete_variable',
          description: '変数を削除します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              variableId: {
                type: 'string',
                description: '変数ID',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId', 'variableId'],
          },
        },
        {
          name: 'create_version',
          description: 'ワークスペースの変更をバージョンとして作成(公開準備)します',
          inputSchema: {
            type: 'object',
            properties: {
              accountId: {
                type: 'string',
                description: 'アカウントID',
              },
              containerId: {
                type: 'string',
                description: 'コンテナID',
              },
              workspaceId: {
                type: 'string',
                description: 'ワークスペースID',
              },
              name: {
                type: 'string',
                description: 'バージョン名(オプション)',
              },
              notes: {
                type: 'string',
                description: 'バージョンノート(オプション)',
              },
            },
            required: ['accountId', 'containerId', 'workspaceId'],
          },
        },
      ],
    }));
  • GTMClient helper method that authenticates and calls the Google Tag Manager API to list variables in the specified workspace.
    async listVariables(accountId, containerId, workspaceId) {
      await this.ensureAuth();
      const response = await this.tagmanager.accounts.containers.workspaces.variables.list({
        parent: `accounts/${accountId}/containers/${containerId}/workspaces/${workspaceId}`
      });
      return response.data.variable || [];
    }
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states what the tool does ('get a list') without mentioning permissions needed, pagination behavior, rate limits, or response format. For a read operation with zero annotation coverage, this leaves significant gaps in understanding how the tool behaves.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, efficient sentence in Japanese that directly states the tool's purpose. It is appropriately sized and front-loaded with no wasted words, making it easy to parse quickly.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the tool's complexity (a list operation with three required parameters), lack of annotations, and no output schema, the description is incomplete. It doesn't cover behavioral aspects like pagination, sorting, or error handling, nor does it explain the return values, leaving the agent with insufficient context for reliable use.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema has 100% description coverage (all three parameters are documented in Japanese), so the baseline is 3. The description adds no additional parameter semantics beyond what's in the schema, such as explaining relationships between accountId, containerId, and workspaceId, or providing examples.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose3/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description '指定されたワークスペースの変数一覧を取得します' (Get a list of variables for the specified workspace) clearly states the verb ('取得します' - get) and resource ('変数一覧' - list of variables), but it doesn't distinguish this tool from its sibling 'get_variable' which retrieves a single variable. The purpose is understandable but lacks sibling differentiation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides no guidance on when to use this tool versus alternatives like 'get_variable' (for single variables) or other list tools (e.g., 'list_tags', 'list_triggers'). It mentions the workspace scope but offers no explicit usage context, exclusions, or prerequisites.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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