put-vhost · Rabbitmq MCP: Risk & Policy

WHAT IT DOES

What put-vhost does on Rabbitmq

AI agents use put-vhost to create or update resources in Rabbitmq — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Rabbitmq environment.

WHY IT NEEDS A POLICY

Why put-vhost needs a policy

This tool creates new virtual hosts or updates existing ones, which are reversible changes to RabbitMQ configuration. It does not delete data (would be Destructive), execute arbitrary code (would be Execute), or move money (would be Financial).

From the tool's definition Tool name 'put-vhost' and description 'Create or update a virtual host' indicate a write operation that creates or modifies RabbitMQ virtual host configuration.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

put-vhost Rate-limited

put-vhost 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": {
    "put-vhost": {
      "limits": [
        {
          "counter": "put-vhost_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 Rabbitmq, so you can run agents against it safely.

FAQ

Questions about put-vhost

What does the put-vhost tool do? +

Create or update a virtual host. It is categorised as a Write tool in the Rabbitmq MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on put-vhost? +

Register the Rabbitmq MCP server in PolicyLayer and add a rule for put-vhost: 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 Rabbitmq. Nothing to install.

What risk level is put-vhost? +

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

Can I rate-limit put-vhost? +

Yes. Add a rate_limit block to the put-vhost 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 put-vhost completely? +

Set action: deny in the PolicyLayer policy for put-vhost. 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 put-vhost? +

put-vhost is provided by the Rabbitmq MCP server (rabbitmq-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.