list-template-variables

THE RISK

Low Risk

Why list-template-variables needs a policy

This is a read-only operation that queries and returns information about template variables. It retrieves data without creating, modifying, deleting, or executing any operations. The minimal blast radius and lack of side effects justify a 'low' severity rating.

From the tool's definition Tool name 'list-template-variables' and description 'List all variables in a template prompt' indicate retrieval of template variable metadata with no modification or side effects.

Documented attack patterns abuse exactly the kind of access list-template-variables gives an agent:

POLICY

How to control list-template-variables

PolicyLayer is an MCP gateway — it sits between your AI agents and MCP Prompt Manager, and nothing reaches the server without passing your rules. This is the rule we recommend for list-template-variables:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list-template-variables": {}
  }
}

list-template-variables is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about list-template-variables

What does the list-template-variables tool do? +

List all variables in a template prompt. It is categorised as a Read tool in the MCP Prompt Manager MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list-template-variables? +

Register the MCP Prompt Manager MCP server in PolicyLayer and add a rule for list-template-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 MCP Prompt Manager. Nothing to install.

What risk level is list-template-variables? +

list-template-variables is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list-template-variables? +

Yes. Add a rate_limit block to the list-template-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.

How do I block list-template-variables completely? +

Set action: deny in the PolicyLayer policy for list-template-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.

What MCP server provides list-template-variables? +

list-template-variables is provided by the MCP Prompt Manager MCP server (tae4an/mcp-prompt-manager). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every MCP Prompt Manager tool call.

Start from MCP Prompt Manager, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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