create_vrf · ACI MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_vrf does on ACI MCP Server

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

WHY IT NEEDS A POLICY

Why create_vrf needs a policy

This tool creates a new network routing object (VRF) in the ACI fabric, which is a reversible configuration change that affects network topology and traffic forwarding. It does not delete data (Destructive), execute arbitrary code (Execute), move money (Financial), or merely read data (Read).

From the tool's definition Tool name is 'create_vrf' with description 'Create a new VRF'. VRF (Virtual Routing and Forwarding) is a network routing construct in Cisco ACI that affects traffic forwarding, network isolation, and connectivity.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_vrf Rate-limited

create_vrf 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": {
    "create_vrf": {
      "limits": [
        {
          "counter": "create_vrf_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 ACI MCP Server, so you can run agents against it safely.

FAQ

Questions about create_vrf

What does the create_vrf tool do? +

Create a new VRF. It is categorised as a Write tool in the ACI 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 create_vrf? +

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

What risk level is create_vrf? +

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

Can I rate-limit create_vrf? +

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

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

create_vrf is provided by the ACI MCP Server MCP server (jim-coyne/aci_mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.