list_agent_runtime_endpoints

THE RISK

Low Risk

Why list_agent_runtime_endpoints needs a policy

This tool appears to retrieve or enumerate agent runtime endpoints from AWS Managed Prometheus, which is a read operation with no side effects. The naming convention 'list_*' is a strong signal of a read-only query. Confidence is slightly reduced due to the empty description, but the tool name alone provides sufficient evidence for Read classification.

From the tool's definition Tool name 'list_agent_runtime_endpoints' indicates a listing/enumeration operation. The 'list_' prefix is characteristic of read-only operations that retrieve or query data without modifying state.

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

POLICY

How to control list_agent_runtime_endpoints

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 list_agent_runtime_endpoints:

policy.json

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

list_agent_runtime_endpoints 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 list_agent_runtime_endpoints

What does the list_agent_runtime_endpoints tool do? +

list_agent_runtime_endpoints. 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 list_agent_runtime_endpoints? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for list_agent_runtime_endpoints: 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 list_agent_runtime_endpoints? +

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

Can I rate-limit list_agent_runtime_endpoints? +

Yes. Add a rate_limit block to the list_agent_runtime_endpoints 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_agent_runtime_endpoints completely? +

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

list_agent_runtime_endpoints 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.

CHECK YOUR STACK →