sessions_create · CyPerf MCP Server MCP: Risk & Policy

WHAT IT DOES

What sessions_create does on CyPerf MCP Server

AI agents use sessions_create 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 sessions_create needs a policy

This tool creates a new session, which is a reversible Write operation. It does not execute arbitrary tests or commands immediately, nor does it delete data or move money.

From the tool's definition Tool name 'sessions_create' with description 'Create a new CyPerf session' indicates creation of a new resource/session within the CyPerf network testing platform.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

sessions_create Rate-limited

sessions_create 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": {
    "sessions_create": {
      "limits": [
        {
          "counter": "sessions_create_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 sessions_create

What does the sessions_create tool do? +

[Sessions] Create a new CyPerf session. 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 sessions_create? +

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

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

Can I rate-limit sessions_create? +

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

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

sessions_create 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.