sorted_set_score

THE RISK

Low Risk

Why sorted_set_score needs a policy

This tool retrieves a score value for a member in a sorted set data structure. It is a read-only query operation with no side effects, analogous to a ZSCORE command in Redis-like systems. No data is modified, created, or deleted.

From the tool's definition Get score of member in sorted set

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

POLICY

How to control sorted_set_score

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 sorted_set_score:

policy.json

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

sorted_set_score 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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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 sorted_set_score

What does the sorted_set_score tool do? +

Get score of member in sorted set. 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 sorted_set_score? +

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

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

Can I rate-limit sorted_set_score? +

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

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

sorted_set_score 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 →