Duplicate a layer and insert the copy above it. Parameters: - layer_name: Name of the layer to duplicate; defaults to active layer - image_index: Target image index (default 0) Returns: {layer_name, layer_id}
AI agents use duplicate_layer 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 a new layer (write operation) by duplicating an existing one, which is fully reversible (the duplicate can be deleted). There are no side effects beyond the image state, no data destruction, no code execution, and no financial impact. The operation is minor and non-destructive.
From the tool's definition Tool description states 'Duplicate a layer and insert the copy above it' — a reversible layer creation operation within an image.
Documented attack patterns abuse exactly the kind of access duplicate_layer 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 duplicate_layer:
{
"version": "1",
"default": "deny",
"tools": {
"duplicate_layer": {
"limits": [
{
"counter": "duplicate_layer_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}duplicate_layer 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.
Duplicate a layer and insert the copy above it. Parameters: - layer_name: Name of the layer to duplicate; defaults to active layer - image_index: Target image index (default 0) Returns: {layer_name, layer_id}. 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 duplicate_layer: 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.
duplicate_layer 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 duplicate_layer 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 duplicate_layer. 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.
duplicate_layer 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.