gtm_create_tag · Gtm MCP: Risk & Policy

WHAT IT DOES

What gtm_create_tag does on Gtm

AI agents use gtm_create_tag to create or update resources in Gtm — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Gtm environment.

WHY IT NEEDS A POLICY

Why gtm_create_tag needs a policy

This tool creates new tags in GTM containers, which modifies the tracking and analytics configuration of web properties. While reversible (tags can be deleted or unpublished), the creation of tags can significantly impact data collection, user tracking, and potentially affect website behavior depending on tag configuration.

From the tool's definition Tool name is 'gtm_create_tag' and description states 'Create a new tag in a GTM container'. The server description indicates this enables 'creation, update, and publishing' of tags within Google Tag Manager.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

gtm_create_tag Rate-limited

gtm_create_tag stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gtm_create_tag": {
      "limits": [
        {
          "counter": "gtm_create_tag_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Gtm, so you can run agents against it safely.

FAQ

Questions about gtm_create_tag

What does the gtm_create_tag tool do? +

Create a new tag in a GTM container. It is categorised as a Write tool in the Gtm MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gtm_create_tag? +

Register the Gtm MCP server in PolicyLayer and add a rule for gtm_create_tag: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Gtm. Nothing to install.

What risk level is gtm_create_tag? +

gtm_create_tag is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit gtm_create_tag? +

Yes. Add a rate_limit block to the gtm_create_tag rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block gtm_create_tag completely? +

Set action: deny in the PolicyLayer policy for gtm_create_tag. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides gtm_create_tag? +

gtm_create_tag is provided by the Gtm MCP server (tijevlam/gtm-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.