controllers_set_link_state · CyPerf MCP Server MCP

WHAT IT DOES

What controllers_set_link_state does on CyPerf MCP Server

AI agents invoke controllers_set_link_state to trigger actions in CyPerf MCP Server. 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 IT NEEDS A POLICY

Why controllers_set_link_state needs a policy

This tool triggers an external operation on network hardware by changing the link state of a port (bringing it up or down). This is an Execute-category action because it affects live network infrastructure and its effects depend on arguments. Misuse could disrupt network connectivity for test agents or production systems, warranting high severity.

From the tool's definition Set port link state (up/down)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

controllers_set_link_state Rate-limited

controllers_set_link_state stays usable, but rate-capped — a runaway agent can't fire it dozens of times 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_link_state": {
      "limits": [
        {
          "counter": "controllers_set_link_state_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-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_link_state

What does the controllers_set_link_state tool do? +

[Controllers] Set port link state (up/down). It is categorised as a Execute tool in the CyPerf MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on controllers_set_link_state? +

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

controllers_set_link_state is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit controllers_set_link_state? +

Yes. Add a rate_limit block to the controllers_set_link_state 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_link_state completely? +

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

controllers_set_link_state 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.