put-vhost-limit · Rabbitmq MCP: Risk & Policy

WHAT IT DOES

What put-vhost-limit does on Rabbitmq

AI agents use put-vhost-limit 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-limit needs a policy

This tool modifies vhost limits, which is a reversible configuration change. It does not delete data (Destructive), execute arbitrary code (Execute), transfer money (Financial), or merely read data (Read). The medium severity reflects that misconfigured vhost limits could impact system performance or availability, but the change can be undone by resetting limits.

From the tool's definition Tool name 'put-vhost' and description 'Set a vhost limit' indicates creation or modification of vhost configuration parameters. The 'put' verb and 'Set' action reflect write operations that alter existing resource limits.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

put-vhost-limit Rate-limited

put-vhost-limit 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-limit": {
      "limits": [
        {
          "counter": "put-vhost-limit_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-limit

What does the put-vhost-limit tool do? +

Set a vhost limit for a vhost. 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-limit? +

Register the Rabbitmq MCP server in PolicyLayer and add a rule for put-vhost-limit: 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-limit? +

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

Can I rate-limit put-vhost-limit? +

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

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

put-vhost-limit 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.