cancel_operation · Virtualbox MCP Server MCP: Risk & Policy

WHAT IT DOES

What cancel_operation does on Virtualbox MCP Server

AI agents invoke cancel_operation to trigger actions in Virtualbox 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 cancel_operation needs a policy

Cancelling a running operation actively interrupts an in-progress process (e.g., VM creation, startup, provisioning). This is an execution-level action that triggers an external side effect — terminating an ongoing operation — rather than simply reading data or writing a record.

From the tool's definition Cancels a running operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cancel_operation Rate-limited

cancel_operation 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": {
    "cancel_operation": {
      "limits": [
        {
          "counter": "cancel_operation_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 Virtualbox MCP Server, so you can run agents against it safely.

FAQ

Questions about cancel_operation

What does the cancel_operation tool do? +

Cancels a running operation. It is categorised as a Execute tool in the Virtualbox 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 cancel_operation? +

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

What risk level is cancel_operation? +

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

Can I rate-limit cancel_operation? +

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

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

cancel_operation is provided by the Virtualbox MCP Server MCP server (usemanusai/virtualbox-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.