unifi_create_voucher · UniFi MCP Server MCP: Risk & Policy

WHAT IT DOES

What unifi_create_voucher does on UniFi MCP Server

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

WHY IT NEEDS A POLICY

Why unifi_create_voucher needs a policy

This tool creates new vouchers for guest network access, which is a reversible write operation. It modifies system state by adding new guest credentials but does not delete data, execute arbitrary code, move funds, or perform irreversible changes.

From the tool's definition Tool name 'unifi_create_voucher' and description 'Create guest vouchers' indicate a creation action that modifies guest access credentials/tokens in the UniFi system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

unifi_create_voucher Rate-limited

unifi_create_voucher 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": {
    "unifi_create_voucher": {
      "limits": [
        {
          "counter": "unifi_create_voucher_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 UniFi MCP Server, so you can run agents against it safely.

FAQ

Questions about unifi_create_voucher

What does the unifi_create_voucher tool do? +

Create guest vouchers. It is categorised as a Write tool in the UniFi 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 unifi_create_voucher? +

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

What risk level is unifi_create_voucher? +

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

Can I rate-limit unifi_create_voucher? +

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

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

unifi_create_voucher is provided by the UniFi MCP Server MCP server (mjrestivo16/mcp-unifi). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.