pt_add_module · MCP Packet Tracer MCP: Risk & Policy

WHAT IT DOES

What pt_add_module does on MCP Packet Tracer

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

WHY IT NEEDS A POLICY

Why pt_add_module needs a policy

The tool creates or adds a new module component to the simulated network topology. This is reversible (modules can be deleted via sibling pt_delete_device or pt_delete_link tools), making it Write rather than Destructive. The empty description lowers confidence slightly, but the context from server purpose and naming pattern is clear.

From the tool's definition Tool name 'pt_add_module' with sibling tools 'pt_delete_device' and 'pt_delete_link' suggests topology modification. The server description states it 'control[s] network topologies' and 'configure[s] devices'.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pt_add_module Rate-limited

pt_add_module 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": {
    "pt_add_module": {
      "limits": [
        {
          "counter": "pt_add_module_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 MCP Packet Tracer, so you can run agents against it safely.

FAQ

Questions about pt_add_module

What does the pt_add_module tool do? +

pt_add_module. It is categorised as a Write tool in the MCP Packet Tracer MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pt_add_module? +

Register the MCP Packet Tracer MCP server in PolicyLayer and add a rule for pt_add_module: 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 MCP Packet Tracer. Nothing to install.

What risk level is pt_add_module? +

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

Can I rate-limit pt_add_module? +

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

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

pt_add_module is provided by the MCP Packet Tracer MCP server (mainorcruz/mcp_packet_tracer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.