tool_upload_file · Open Google Image Generator MCP

WHAT IT DOES

What tool_upload_file does on Open Google Image Generator MCP

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

WHY IT NEEDS A POLICY

Why tool_upload_file needs a policy

The tool uploads and registers a file, which is a reversible write operation. It creates a reference/registration in the system but does not execute arbitrary code, delete data, or move money.

From the tool's definition Tool description states 'Register a local file for use as a reference image in other tools' — this creates or registers data in the system (a reference to an uploaded file) that persists for subsequent operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

tool_upload_file Rate-limited

tool_upload_file 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": {
    "tool_upload_file": {
      "limits": [
        {
          "counter": "tool_upload_file_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 Open Google Image Generator MCP, so you can run agents against it safely.

FAQ

Questions about tool_upload_file

What does the tool_upload_file tool do? +

Register a local file for use as a reference image in other tools (e.g. tool_transform_image). It is categorised as a Write tool in the Open Google Image Generator MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on tool_upload_file? +

Register the Open Google Image Generator MCP server in PolicyLayer and add a rule for tool_upload_file: 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 Open Google Image Generator MCP. Nothing to install.

What risk level is tool_upload_file? +

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

Can I rate-limit tool_upload_file? +

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

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

tool_upload_file is provided by the Open Google Image Generator MCP server (miracorhan/opengoogleimagegeneratormcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.