AI agents call gtm_list_variables to retrieve information from Gtm without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only retrieves and enumerates existing variables from a GTM container. It performs no creation, modification, deletion, or execution of code. While GTM manages tracking and analytics code, merely listing variables is a read operation with minimal blast radius—it only exposes metadata about configured variables without triggering any analytics events or account changes.
From the tool's definition Tool name is 'gtm_list_variables' and description states 'List all variables in a container workspace'. The verb 'list' indicates a query operation that retrieves data without modification or side effects.
Attacks that exploit this kind of access
List all variables in a container workspace. It is categorised as a Read tool in the Gtm MCP Server, which means it retrieves data without modifying state.
Register the Gtm MCP server in PolicyLayer and add a rule for gtm_list_variables: 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.
gtm_list_variables is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the gtm_list_variables 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_list_variables. 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_list_variables 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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