AI agents call gtm_list_versions 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 queries and retrieves a list of container versions from Google Tag Manager. It performs a non-destructive read operation that returns information about existing versions without creating, modifying, deleting, or executing anything. The blast radius of misuse is minimal—an attacker could view version history but cannot alter or execute container configurations.
From the tool's definition Tool name 'gtm_list_versions' and description 'List all versions of a GTM container' indicate retrieval of existing data with no modification or side effects.
Attacks that exploit this kind of access
List all versions of a GTM container. 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_versions: 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_versions 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_versions 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_versions. 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_versions 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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