Apply a vignette darkening effect around the edges of a layer. Parameters: - softness: Edge softness / fade width (default 3.0) - shape: Shape factor — 1.0 = elliptical (default), values >1 = more rectangular - layer_name: Target layer; defaults to active layer - image_index: Target image index (...
AI agents use apply_vignette 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 creates or modifies image data (vignette effect) but does not execute arbitrary code, delete data, or cause financial impact. It is reversible—the user can undo the effect or apply a different filter. While it manipulates pixels, it does so through a constrained operation (vignette application) rather than arbitrary code execution. Write is appropriate for tools that create or modify data reversibly.
From the tool's definition Tool applies a vignette darkening effect to a layer, modifying image pixels through GIMP's PyGObject API. Parameters like softness and shape control the visual transformation.
Documented attack patterns abuse exactly the kind of access apply_vignette 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 apply_vignette:
{
"version": "1",
"default": "deny",
"tools": {
"apply_vignette": {
"limits": [
{
"counter": "apply_vignette_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}apply_vignette 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.
Free to start. No card required.
Apply a vignette darkening effect around the edges of a layer. Parameters: - softness: Edge softness / fade width (default 3.0) - shape: Shape factor — 1.0 = elliptical (default), values >1 = more rectangular - layer_name: Target layer; defaults to active layer - image_index: Target image index (default 0) 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 apply_vignette: 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.
apply_vignette 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 apply_vignette 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 apply_vignette. 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.
apply_vignette 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.