sorted_set_add

THE RISK

Medium Risk

Why sorted_set_add needs a policy

This tool creates or modifies data in a sorted set by adding new member-score pairs. It is reversible (members can be removed or updated later), making it a Write operation rather than Destructive. The severity is medium because misuse could corrupt application state or introduce invalid data, but the impact is limited to the specific sorted set being modified and is not irreversible.

From the tool's definition Tool name 'sorted_set_add' and description 'Add member-score pairs to sorted set' indicate a data structure modification operation. The verb 'Add' and the action of inserting members with scores into a sorted set represent creation/modification of data.

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

POLICY

How to control sorted_set_add

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_add:

policy.json

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

sorted_set_add 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_add

What does the sorted_set_add tool do? +

Add member-score pairs to 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_add? +

Register the Amazon ECS MCP Server MCP server in PolicyLayer and add a rule for sorted_set_add: 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_add? +

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

Can I rate-limit sorted_set_add? +

Yes. Add a rate_limit block to the sorted_set_add 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_add completely? +

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

sorted_set_add 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 →