Sharpen a layer using unsharp mask. Parameters: - amount: Sharpening strength 0-500 (default 50.0) - radius: Blur radius for the mask in pixels (default 3.0) - threshold: Minimum difference before sharpening is applied (default 0) - image_index: Target image index (default 0) - layer_name: Layer ...
AI agents use sharpen 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.
This tool modifies image data (the layer) but does so reversibly—the original image data is not deleted, and sharpening filters can be undone, adjusted, or reverted in GIMP. It is not destructive (no deletion), not financial, and not code execution with arbitrary side effects. It falls under Write because it creates or modifies data in a controlled, reversible manner.
From the tool's definition Tool modifies image layers non-destructively by applying a sharpen filter (unsharp mask) with configurable parameters (amount, radius, threshold).
Documented attack patterns abuse exactly the kind of access sharpen 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 sharpen:
{
"version": "1",
"default": "deny",
"tools": {
"sharpen": {
"limits": [
{
"counter": "sharpen_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}sharpen 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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Sharpen a layer using unsharp mask. Parameters: - amount: Sharpening strength 0-500 (default 50.0) - radius: Blur radius for the mask in pixels (default 3.0) - threshold: Minimum difference before sharpening is applied (default 0) - image_index: Target image index (default 0) - layer_name: Layer to sharpen; defaults to active layer Returns status dict. 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 sharpen: 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.
sharpen 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 sharpen 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 sharpen. 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.
sharpen 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.
Free to start. No card required.
79 Gimp tools catalogued and risk-classified — across an index of 43,000+ MCP servers.