add_vm_share · Mcp Utm MCP: Risk & Policy

WHAT IT DOES

What add_vm_share does on Mcp Utm

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

WHY IT NEEDS A POLICY

Why add_vm_share needs a policy

This tool appears to add a shared resource to a virtual machine, which is a Write operation (creates or modifies configuration reversibly). While the description is empty, the name 'add_vm_share' and the context of a VM management server strongly suggest it creates a new share mount/configuration.

From the tool's definition Tool name 'add_vm_share' indicates creation/addition of a shared resource. Sibling tools include 'delete_vm', 'export_vm', and 'clone_vm', suggesting this server performs configuration operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_vm_share Rate-limited

add_vm_share 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": {
    "add_vm_share": {
      "limits": [
        {
          "counter": "add_vm_share_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 Utm, so you can run agents against it safely.

FAQ

Questions about add_vm_share

What does the add_vm_share tool do? +

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

How do I enforce a policy on add_vm_share? +

Register the Mcp Utm MCP server in PolicyLayer and add a rule for add_vm_share: 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 Utm. Nothing to install.

What risk level is add_vm_share? +

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

Can I rate-limit add_vm_share? +

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

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

add_vm_share is provided by the Mcp Utm MCP server (neverprepared/mcp-utm). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.