generate_image · Server Puppeteer MCP: Risk & Policy

WHAT IT DOES

What generate_image does on Server Puppeteer

AI agents invoke generate_image to trigger actions in Server Puppeteer. 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 generate_image needs a policy

This tool triggers an external AI image generation service (EverArt Models), which constitutes executing an external operation with side effects. It is not a simple read/query operation — it creates a new image resource via an external API call. While the result is a link (not stored locally), the act of invoking an external generative model and consuming API resources places it in Execute.

From the tool's definition Generate images using EverArt Models and returns a clickable link to view the generated image

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate_image Rate-limited

generate_image 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": {
    "generate_image": {
      "limits": [
        {
          "counter": "generate_image_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 Server Puppeteer, so you can run agents against it safely.

FAQ

Questions about generate_image

What does the generate_image tool do? +

Generate images using EverArt Models and returns a clickable link to view the generated image. It is categorised as a Execute tool in the Server Puppeteer MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on generate_image? +

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

What risk level is generate_image? +

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

Can I rate-limit generate_image? +

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

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

generate_image is provided by the Server Puppeteer MCP server (@hisma/server-puppeteer). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.