get_serverless_templates

THE RISK

Low Risk

Why get_serverless_templates needs a policy

Based on the naming convention 'get_*', this tool appears to retrieve or query serverless templates from Prometheus/AWS. Without description text, we assume standard read semantics: fetching existing configuration or template data causes no modifications.

From the tool's definition Tool name 'get_serverless_templates' indicates retrieval of template data. No description provided, but the 'get_' prefix is a strong signal of read-only retrieval with no side effects.

Documented attack patterns abuse exactly the kind of access get_serverless_templates gives an agent:

POLICY

How to control get_serverless_templates

PolicyLayer is an MCP gateway — it sits between your AI agents and Prometheus MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_serverless_templates:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_serverless_templates": {}
  }
}

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

Create a free account and register Prometheus MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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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.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_serverless_templates

What does the get_serverless_templates tool do? +

get_serverless_templates. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_serverless_templates? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for get_serverless_templates: 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 Prometheus MCP Server. Nothing to install.

What risk level is get_serverless_templates? +

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

Can I rate-limit get_serverless_templates? +

Yes. Add a rate_limit block to the get_serverless_templates 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 get_serverless_templates completely? +

Set action: deny in the PolicyLayer policy for get_serverless_templates. 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 get_serverless_templates? +

get_serverless_templates is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Prometheus MCP Server tool call.

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

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