apply_template · Rawtherapee MCP: Risk & Policy

WHAT IT DOES

What apply_template does on Rawtherapee

AI agents use apply_template 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 apply_template needs a policy

The tool applies a template to RAW photo development, which modifies image processing parameters reversibly. This is a Write operation—it creates or modifies photo settings and output, but is not destructive (the original RAW file remains unchanged). Severity is medium because unintended template application could require re-editing work, but the operation is easily reversible and affects only user images.

From the tool's definition Tool name 'apply_template' in context of RawTherapee CLI photo development server; sibling tools include 'apply_lens_correction', 'apply_local_preset', 'apply_lut' which are all photo editing operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apply_template Rate-limited

apply_template 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": {
    "apply_template": {
      "limits": [
        {
          "counter": "apply_template_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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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 apply_template

What does the apply_template tool do? +

apply_template. 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 apply_template? +

Register the Rawtherapee MCP server in PolicyLayer and add a rule for apply_template: 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 apply_template? +

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

Can I rate-limit apply_template? +

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

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

apply_template 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.