Performs all GTM variable operations: create, get, list, update, remove, revert. The
AI agents call gtm_variable to permanently remove resources in Google Tag Manager MCP Server — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
The tool supports 'remove' (irreversible deletion of GTM variables) among its operations. Since the most severe applicable category must be chosen, and 'remove' constitutes irreversible deletion of GTM variables that could break tag firing and data collection across a site, this falls under Destructive.
From the tool's definition Performs all GTM variable operations: create, get, list, update, remove, revert
Documented attack patterns abuse exactly the kind of access gtm_variable gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Google Tag Manager MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for gtm_variable:
{
"version": "1",
"default": "deny",
"hide": [
"gtm_variable"
]
}gtm_variable disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Performs all GTM variable operations: create, get, list, update, remove, revert. The. It is categorised as a Destructive tool in the Google Tag Manager MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Google Tag Manager MCP Server MCP server in PolicyLayer and add a rule for gtm_variable: 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 Google Tag Manager MCP Server. Nothing to install.
gtm_variable is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the gtm_variable 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.
Set action: deny in the PolicyLayer policy for gtm_variable. 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.
gtm_variable is provided by the Google Tag Manager MCP Server MCP server (stape-io/google-tag-manager-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 18 Google Tag Manager MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
18 Google Tag Manager MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.