Crop the image canvas to the current selection bounds. Parameters: - autocrop: If True, auto-detect crop bounds instead of using selection (default False) - image_index: Target image index (default 0) Returns: {status, x, y, width, height} — crop region applied
AI agents use crop_to_selection 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 reversible image modification (Write category) rather than destructive deletion, as it can be undone in GIMP through Edit > Undo. However, it irreversibly alters image dimensions if not undone, warranting medium severity. The confidence is high because the tool's purpose is unambiguous—it modifies image canvas size based on selection parameters.
From the tool's definition The tool 'crop_to_selection' modifies image data by permanently reducing the canvas size to selection bounds.
Documented attack patterns abuse exactly the kind of access crop_to_selection 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_selection:
{
"version": "1",
"default": "deny",
"tools": {
"crop_to_selection": {
"limits": [
{
"counter": "crop_to_selection_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}crop_to_selection 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 the current selection bounds. Parameters: - autocrop: If True, auto-detect crop bounds instead of using selection (default False) - image_index: Target image index (default 0) Returns: {status, x, y, width, height} — crop region applied. 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_selection: 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_selection 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_selection 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_selection. 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_selection 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.