crow_generate_background

THE RISK

Medium Risk

Why crow_generate_background needs a policy

This tool creates (generates) and modifies (sets) a background image, which is a reversible write operation. The generation triggers an external image synthesis service (SDXL Turbo), but the result is a stored asset modification rather than executing arbitrary code or causing destructive effects.

From the tool's definition Tool description states 'Generate a new AI background image via SDXL Turbo. The image is set as the companion', indicating creation and modification of a background image asset.

Documented attack patterns abuse exactly the kind of access crow_generate_background gives an agent:

POLICY

How to control crow_generate_background

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for crow_generate_background:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crow_generate_background": {
      "limits": [
        {
          "counter": "crow_generate_background_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

crow_generate_background 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.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_generate_background

What does the crow_generate_background tool do? +

Generate a new AI background image via SDXL Turbo. The image is set as the companion. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crow_generate_background? +

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

What risk level is crow_generate_background? +

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

Can I rate-limit crow_generate_background? +

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

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

crow_generate_background is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →