Crop the image canvas to an explicit rectangle. Parameters: - x, y: Top-left corner of the crop rectangle - width, height: Dimensions of the crop rectangle - image_index: Target image index (default 0) Returns: {status, x, y, width, height}
AI agents use crop_to_rect to create or update resources in Gimp — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Gimp environment.
Cropping is a Write operation—it modifies image data (removes content outside the crop area) but the change is reversible through undo functionality typical in GIMP. It does not delete files, execute arbitrary code, or cause irreversible loss of the original file.
From the tool's definition Tool description states 'Crop the image canvas to an explicit rectangle' with parameters for position and dimensions. Cropping modifies the image by removing portions of the canvas, which is a reversible image transformation.
Documented attack patterns abuse exactly the kind of access crop_to_rect gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Gimp, and nothing reaches the server without passing your rules. This is the rule we recommend for crop_to_rect:
{
"version": "1",
"default": "deny",
"tools": {
"crop_to_rect": {
"limits": [
{
"counter": "crop_to_rect_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}crop_to_rect 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.
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Crop the image canvas to an explicit rectangle. Parameters: - x, y: Top-left corner of the crop rectangle - width, height: Dimensions of the crop rectangle - image_index: Target image index (default 0) Returns: {status, x, y, width, height}. It is categorised as a Write tool in the Gimp MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Gimp MCP server in PolicyLayer and add a rule for crop_to_rect: 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 Gimp. Nothing to install.
crop_to_rect is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the crop_to_rect 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.
Set action: deny in the PolicyLayer policy for crop_to_rect. 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.
crop_to_rect is provided by the Gimp MCP server (maorcc/gimp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Gimp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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79 Gimp tools catalogued and risk-classified — across an index of 43,000+ MCP servers.