StopFlrMount · Veeam VBR v13 MCP Server MCP: Risk & Policy

WHAT IT DOES

What StopFlrMount does on Veeam VBR v13 MCP Server

AI agents invoke StopFlrMount to trigger actions in Veeam VBR v13 MCP Server. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why StopFlrMount needs a policy

This tool executes a command to stop/unmount an active file restore (FLR) session in Veeam backup infrastructure. While not permanently destructive, unmounting a restore session is an irreversible state change operation that interrupts an ongoing process, affecting backup recovery workflows.

From the tool's definition Tool name 'StopFlrMount' and description 'Unmount a file restore session' indicate an action that terminates an active file-level restore operation with external effects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

StopFlrMount Rate-limited

StopFlrMount stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "StopFlrMount": {
      "limits": [
        {
          "counter": "stopflrmount_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Veeam VBR v13 MCP Server, so you can run agents against it safely.

FAQ

Questions about StopFlrMount

What does the StopFlrMount tool do? +

Unmount a file restore session. It is categorised as a Execute tool in the Veeam VBR v13 MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on StopFlrMount? +

Register the Veeam VBR v13 MCP Server MCP server in PolicyLayer and add a rule for StopFlrMount: 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 Veeam VBR v13 MCP Server. Nothing to install.

What risk level is StopFlrMount? +

StopFlrMount is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit StopFlrMount? +

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

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

StopFlrMount is provided by the Veeam VBR v13 MCP Server MCP server (kid-boy/veeam-mcp-13). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.