sorted_set_remove_by_lex

THE RISK

Medium Risk

Why sorted_set_remove_by_lex needs a policy

This tool modifies an existing data structure by removing members, which qualifies as Write rather than Destructive. While 'remove' sounds destructive, removing members from a sorted set is reversible (data can be re-added) unlike irreversible deletion of entire records or databases.

From the tool's definition Tool name 'sorted_set_remove_by_lex' indicates removal of members from a sorted set by lexicographical range. The verb 'remove' indicates modification of data.

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

POLICY

How to control sorted_set_remove_by_lex

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_remove_by_lex:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "sorted_set_remove_by_lex": {
      "limits": [
        {
          "counter": "sorted_set_remove_by_lex_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

sorted_set_remove_by_lex stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

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EXPLORE

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All 805 Prometheus MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about sorted_set_remove_by_lex

What does the sorted_set_remove_by_lex tool do? +

Remove members by lexicographical range. It is categorised as a Write tool in the Prometheus MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on sorted_set_remove_by_lex? +

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

sorted_set_remove_by_lex is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit sorted_set_remove_by_lex? +

Yes. Add a rate_limit block to the sorted_set_remove_by_lex 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_remove_by_lex completely? +

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

sorted_set_remove_by_lex 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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