configs_update · CyPerf MCP Server MCP: Risk & Policy

WHAT IT DOES

What configs_update does on CyPerf MCP Server

AI agents use configs_update 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 configs_update needs a policy

The tool creates or modifies configuration metadata reversibly. While updates to test configurations in a network performance testing context could affect ongoing tests or future test behavior, the operation itself is not destructive (data remains recoverable/modifiable) and does not execute arbitrary code or commands.

From the tool's definition Tool name 'configs_update' and description 'Update configuration metadata' indicate modification of existing data without deletion or irreversible change.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

configs_update Rate-limited

configs_update 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": {
    "configs_update": {
      "limits": [
        {
          "counter": "configs_update_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 configs_update

What does the configs_update tool do? +

[Configurations] Update configuration metadata. 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 configs_update? +

Register the CyPerf MCP Server MCP server in PolicyLayer and add a rule for configs_update: 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 configs_update? +

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

Can I rate-limit configs_update? +

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

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

configs_update 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.