controllers_set_aggregation · CyPerf MCP Server MCP

WHAT IT DOES

What controllers_set_aggregation does on CyPerf MCP Server

AI agents use controllers_set_aggregation to create or update resources in CyPerf MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your CyPerf MCP Server environment.

WHY IT NEEDS A POLICY

Why controllers_set_aggregation needs a policy

This tool modifies controller configuration (aggregation mode) rather than retrieving data, so it is a Write operation. The severity is medium because changing aggregation settings could affect network performance monitoring and data collection but is reversible and does not delete data or trigger financial transactions.

From the tool's definition Tool name 'controllers_set_aggregation' with description 'Set node aggregation mode' indicates a configuration modification operation. The verb 'set' combined with 'aggregation mode' suggests changing controller settings, which modifies system state.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

controllers_set_aggregation Rate-limited

controllers_set_aggregation 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.

View as policy code

policy.json

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

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches CyPerf MCP Server, so you can run agents against it safely.

FAQ

Questions about controllers_set_aggregation

What does the controllers_set_aggregation tool do? +

[Controllers] Set node aggregation mode. It is categorised as a Write tool in the CyPerf 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 controllers_set_aggregation? +

Register the CyPerf MCP Server MCP server in PolicyLayer and add a rule for controllers_set_aggregation: 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 CyPerf MCP Server. Nothing to install.

What risk level is controllers_set_aggregation? +

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

Can I rate-limit controllers_set_aggregation? +

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

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

controllers_set_aggregation is provided by the CyPerf MCP Server MCP server (keysight/cyperf-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.