How to connect Google Tag Manager to Claude Code

1. 1. Enable Google Tag Manager in Metorial

   In your Metorial portal, enable the Google Tag Manager MCP server and sign in with the account that owns the data. Access stays governed by your team policies.

2. 2. Add the server over HTTP

   Add --scope user to use it in every project.

   Copy

   claude mcp add --transport http metorial <your-magic-mcp-url>

3. 3. Sign in

   Run /mcp, select Metorial and sign in to load Google Tag Manager tools.

• Manage User Permission: Create, list, get, update, or delete user permissions for a GTM account.
• Manage Container: Create, retrieve, update, or delete a GTM container.
• Manage Trigger: Create, list, get, update, or delete triggers in a GTM workspace.
• Manage Workspace: Create, list, update, delete, or sync GTM workspaces.
• Manage Folder: Create, list, get, update, or delete folders in a GTM workspace.
• Manage Environment: Create, list, get, update, delete, or reauthorize GTM environments.
• Manage Variable: Create, list, get, update, or delete user-defined variables in a GTM workspace.
• Manage Tag: Create, list, get, update, delete, or revert tags in a GTM workspace.
• Manage Version: Create, list, get, publish, or delete container versions.
• List Accounts & Containers: Lists GTM accounts you have access to, optionally including their containers.
• Update Account: Update the name or anonymous data sharing setting of a Google Tag Manager account.

• Google Tag Manager tools appear as mcp__metorial__<tool>. Use that name in permission rules to allow or deny a tool.
• Run /mcp to see whether Metorial is connected and to sign in again.
• Claude Code warns when a tool result passes 10,000 tokens and caps it at 25,000 by default. Raise the cap with MAX_MCP_OUTPUT_TOKENS.
• Pre-approve trusted Google Tag Manager tools with allow rules in your settings so Claude Code stops asking each time.

claude mcp list shows "Needs authentication"

Run /mcp, select Metorial, and sign in. If sign-in keeps failing, choose Clear authentication in the same menu and sign in again.

A teammate sees "Pending approval"

Servers shared through a project .mcp.json need approval. Run claude in the project and approve Metorial when asked.

Large tool results are cut off

Claude Code limits MCP tool output to 25,000 tokens by default. Raise it with the MAX_MCP_OUTPUT_TOKENS environment variable.

Based on the Claude Code MCP documentation.