invert_mask

Invert the active mask (or a specific mask by ID).

SERVERLightroom Classic MCP SOURCE4xiomdev/lightroom-classic-mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/4xiomdev-lightroom-classic-mcp/invert-mask.md

WHAT IT DOES

What invert_mask does on Lightroom Classic MCP

AI agents use invert_mask to create or update resources in Lightroom Classic MCP, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Lightroom Classic MCP environment.

RISK

Why invert_mask is rated Medium

Inverting a mask modifies the current develop/editing state of a photo in Lightroom Classic. This is a reversible write operation — it changes which areas of the image are affected by local adjustments, but can be undone. It does not delete data or execute arbitrary code.

From the tool's definition Invert the active mask (or a specific mask by ID)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs invert_mask safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Lightroom Classic MCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For invert_mask, this is the rule to start with:

invert_mask Rate-limited

invert_mask 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "invert_mask": {
      "limits": [
        {
          "counter": "invert_mask_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Lightroom Classic MCP, apply this rule, and every invert_mask call is checked against it from then on.

FAQ

Questions about invert_mask

What does the invert_mask tool do? +

Invert the active mask (or a specific mask by ID). It is categorised as a Write tool in the Lightroom Classic MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on invert_mask? +

Register the Lightroom Classic MCP server in PolicyLayer and add a rule for invert_mask: 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 Lightroom Classic MCP. Nothing to install.

What risk level is invert_mask? +

invert_mask is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit invert_mask? +

Yes. Add a rate_limit block to the invert_mask 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_mask completely? +

Set action: deny in the PolicyLayer policy for invert_mask. 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_mask? +

invert_mask is provided by the Lightroom Classic MCP server (4xiomdev/lightroom-classic-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

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