invert_selection

THE RISK

High Risk

Why invert_selection needs a policy

This tool modifies the active selection state in GIMP — inverting which pixels are selected. It doesn't read data, write/create persistent content, or delete anything; it triggers an operation on GIMP's internal state (the selection mask). This fits Execute as it performs an action within an external application. The blast radius is low since it only changes the selection, not image pixels directly.

From the tool's definition Invert the current selection (select what is not selected)

Documented attack patterns abuse exactly the kind of access invert_selection gives an agent:

POLICY

How to control invert_selection

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 invert_selection:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "invert_selection": {
      "limits": [
        {
          "counter": "invert_selection_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

invert_selection stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Gimp — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Gimp tools

Destructive delete_layer Delete a layer from an image. Parameters: - layer_name: Name of the layer to dele Execute restart_server Drop and re-establish the connection to the GIMP MCP plugin. Use this when: - GIM Execute scale_image scale_image Execute call_api call_api Execute open_image Open an image file in GIMP and create a display window. Parameters: - file_path: Execute select_by_color select_by_color Execute select_rectangle select_rectangle Execute set_active_image Raise a specific image to the front / make it active in GIMP. Parameters: - image

All 79 Gimp tools →

Execute tools on other servers

Android Forensics ADB MCP Server adb_shell_command EMBA-MCP run_emba_scan Frida Game Hacking MCP remove_breakpoint Procmon request_elevation

Go deeper

High-risk tools in Gimp → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about invert_selection

What does the invert_selection tool do? +

Invert the current selection (select what is not selected). Parameters: - image_index: Target image index (default 0) Returns status dict. It is categorised as a Execute tool in the Gimp MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on invert_selection? +

Register the Gimp MCP server in PolicyLayer and add a rule for invert_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.

What risk level is invert_selection? +

invert_selection is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit invert_selection? +

Yes. Add a rate_limit block to the invert_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.

How do I block invert_selection completely? +

Set action: deny in the PolicyLayer policy for invert_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.

What MCP server provides invert_selection? +

invert_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.

Enforce policy on every Gimp tool call.

Start from Gimp, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →