scale

What scale does on Ncp

AI agents invoke scale to trigger actions in Ncp. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

Why scale is rated High

Scaling EC2 resources is an executable action that modifies cloud infrastructure state. While not immediately destructive (instances can be scaled back down), it commits operational changes with cost and availability implications. This is more severe than Write (which is reversible data modification) because it triggers external infrastructure operations.

From the tool's definition Tool name 'scale' combined with description 'Scale aws-ec2-api resources' indicates triggering AWS EC2 scaling operations, which execute infrastructure changes with real-world effects (launching or terminating instances).

The rule that runs scale safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ncp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For scale, this is the rule to start with:

{
  "version": "1",
  "default": "deny",
  "tools": {
    "scale": {
      "limits": [
        {
          "counter": "scale_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

Questions about scale