sorted_set_remove

THE RISK

Medium Risk

Why sorted_set_remove needs a policy

This tool modifies existing data by removing members from a sorted set, which is a Write operation. It is not Destructive because the action is reversible and does not permanently purge data. Severity is medium because while it modifies data, the blast radius is limited to removing set members from what appears to be a cache or temporary data structure (not a critical database).

From the tool's definition Tool name 'sorted_set_remove' and description 'Remove member(s) from sorted set' indicates modification of data structure contents. The action is reversible (members can be re-added) and affects a single data collection without permanent destruction.

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

POLICY

How to control sorted_set_remove

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

policy.json

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

sorted_set_remove 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 Amazon ECS 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 →

Free to start. No card required.

EXPLORE

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Go deeper

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
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 →
PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about sorted_set_remove

What does the sorted_set_remove tool do? +

Remove member(s) from sorted set. It is categorised as a Write tool in the Amazon ECS 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? +

Register the Amazon ECS MCP Server MCP server in PolicyLayer and add a rule for sorted_set_remove: 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 Amazon ECS MCP Server. Nothing to install.

What risk level is sorted_set_remove? +

sorted_set_remove 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? +

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

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

sorted_set_remove is provided by the Amazon ECS MCP Server MCP server (awslabs.ecs-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 Amazon ECS MCP Server tool call.

Start from Amazon ECS 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 →