create_file_preview_request · Smokeball MCP: Risk & Policy

WHAT IT DOES

What create_file_preview_request does on Smokeball

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

WHY IT NEEDS A POLICY

Why create_file_preview_request needs a policy

This tool creates a new preview artifact (thumbnail or rendition) for an existing file. It is a reversible write operation—the preview can be deleted or regenerated—and has no destructive, financial, or code-execution implications. It modifies system state by adding a new preview resource, placing it in the Write category.

From the tool's definition Tool name is 'create_file_preview_request' and description states it 'Request generation of a preview (thumbnail/rendition) for a file.' The word 'create' and 'generation' indicate a write/create operation that produces new data (a preview artifact).

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_file_preview_request Rate-limited

create_file_preview_request 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": {
    "create_file_preview_request": {
      "limits": [
        {
          "counter": "create_file_preview_request_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 Smokeball, so you can run agents against it safely.

FAQ

Questions about create_file_preview_request

What does the create_file_preview_request tool do? +

Request generation of a preview (thumbnail/rendition) for a file. It is categorised as a Write tool in the Smokeball MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on create_file_preview_request? +

Register the Smokeball MCP server in PolicyLayer and add a rule for create_file_preview_request: 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 Smokeball. Nothing to install.

What risk level is create_file_preview_request? +

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

Can I rate-limit create_file_preview_request? +

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

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

create_file_preview_request is provided by the Smokeball MCP server (rosenadvertising/smokeball-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.