upload_volume · CloudStack MCP Server MCP: Risk & Policy

WHAT IT DOES

What upload_volume does on CloudStack MCP Server

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

WHY IT NEEDS A POLICY

Why upload_volume needs a policy

The tool uploads (creates/imports) a volume, which is a Write operation that modifies infrastructure state reversibly. While it operates on critical storage infrastructure with significant blast radius if misused (potential data corruption or storage exhaustion), it is not Destructive (does not delete/overwrite existing volumes irreversibly), not Execute (does not run arbitrary code), and not Financial.

From the tool's definition Tool named 'upload_volume' with description 'Upload a volume from URL'. This creates/modifies storage by importing data from an external source into CloudStack infrastructure.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_volume Rate-limited

upload_volume 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": {
    "upload_volume": {
      "limits": [
        {
          "counter": "upload_volume_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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

FAQ

Questions about upload_volume

What does the upload_volume tool do? +

Upload a volume from URL. It is categorised as a Write tool in the CloudStack MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upload_volume? +

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

What risk level is upload_volume? +

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

Can I rate-limit upload_volume? +

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

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

upload_volume is provided by the CloudStack MCP Server MCP server (mozg31337/cloudstack-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.