add_device_preset_tool · Rawtherapee MCP: Risk & Policy

WHAT IT DOES

What add_device_preset_tool does on Rawtherapee

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

WHY IT NEEDS A POLICY

Why add_device_preset_tool needs a policy

This tool creates new presets (reversible writes) and stores them persistently. It does not delete data (Destructive), execute code (Execute), handle money (Financial), or merely read data (Read).

From the tool's definition Tool creates and persists a custom device/format preset. The words 'Create and persist' indicate data is being written and stored. This modifies configuration state rather than performing destructive operations or executing arbitrary commands.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

add_device_preset_tool Rate-limited

add_device_preset_tool 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": {
    "add_device_preset_tool": {
      "limits": [
        {
          "counter": "add_device_preset_tool_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Rawtherapee, so you can run agents against it safely.

FAQ

Questions about add_device_preset_tool

What does the add_device_preset_tool tool do? +

Create and persist a custom device/format preset for cropping and resizing. It is categorised as a Write tool in the Rawtherapee MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on add_device_preset_tool? +

Register the Rawtherapee MCP server in PolicyLayer and add a rule for add_device_preset_tool: 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 Rawtherapee. Nothing to install.

What risk level is add_device_preset_tool? +

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

Can I rate-limit add_device_preset_tool? +

Yes. Add a rate_limit block to the add_device_preset_tool 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 add_device_preset_tool completely? +

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

add_device_preset_tool is provided by the Rawtherapee MCP server (lucamarien/rawtherapee-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.