aggregate

THE RISK

Low Risk

Why aggregate needs a policy

The description is empty and the name 'aggregate' alone is ambiguous — it could mean reading/querying aggregated data or performing some operation. Without further context, cannot confidently assign a meaningful risk category. Defaulting to Other with low confidence.

From the tool's definition Tool name is 'aggregate' with an empty description. No functional details are provided.

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

POLICY

How to control aggregate

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "aggregate": {
      "limits": [
        {
          "counter": "aggregate_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

aggregate gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register AWS AppSync 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.

SET A RULE FOR 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.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about aggregate

What does the aggregate tool do? +

aggregate. It is categorised as a Other tool in the AWS AppSync MCP Server MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on aggregate? +

Register the AWS AppSync MCP Server MCP server in PolicyLayer and add a rule for aggregate: 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 AWS AppSync MCP Server. Nothing to install.

What risk level is aggregate? +

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

Can I rate-limit aggregate? +

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

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

aggregate is provided by the AWS AppSync MCP Server MCP server (awslabs.aws-appsync-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 AWS AppSync MCP Server tool call.

Start from AWS AppSync 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 →