Fill an entire layer with a solid color. Parameters: - color: Fill color as CSS name, hex, or rgb() string - layer_name: Layer to fill; defaults to active layer - image_index: Target image index (default 0) Returns status dict.
AI agents use fill_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 or modifies image data reversibly—a layer can be refilled with a different color or have the fill undone. It does not delete data (Destructive), execute arbitrary code (Execute), or perform financial operations (Financial). It falls under Write as it changes image state in a way that can be reversed through normal editing operations.
From the tool's definition Tool description states 'Fill an entire layer with a solid color' with parameters for color and layer selection. This modifies image data by replacing layer content with a solid fill.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access fill_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 fill_layer:
{
"version": "1",
"default": "deny",
"tools": {
"fill_layer": {
"limits": [
{
"counter": "fill_layer_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}fill_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.
Fill an entire layer with a solid color. Parameters: - color: Fill color as CSS name, hex, or rgb() string - layer_name: Layer to fill; 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 fill_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.
fill_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 fill_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 fill_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.
fill_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.