list_get

THE RISK

Low Risk

Why list_get needs a policy

This tool retrieves data from a list by index position. It performs a read-only query operation that returns a value without modifying, creating, or deleting data. The action has no side effects and is therefore classified as Read with low severity.

From the tool's definition Tool name 'list_get' and description 'Get value at index from list' indicate a retrieval operation with no side effects.

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

POLICY

How to control list_get

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_get:

policy.json

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

list_get 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 →

Free to start. No card required.

EXPLORE

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All 805 Prometheus MCP Server tools →

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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_get

What does the list_get tool do? +

Get value at index from list. 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_get? +

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

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

Can I rate-limit list_get? +

Yes. Add a rate_limit block to the list_get 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_get completely? +

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

list_get 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 →