apply_lens_correction · Rawtherapee MCP: Risk & Policy

WHAT IT DOES

What apply_lens_correction does on Rawtherapee

AI agents use apply_lens_correction 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_lens_correction needs a policy

Lens correction in RAW development modifies image parameters (distortion, vignetting, chromatic aberration) reversibly. This is a data modification operation (Write category) rather than Execute (no arbitrary code/CLI commands triggered) or Destructive (corrected images can be reverted).

From the tool's definition Tool name 'apply_lens_correction' combined with server context showing RAW photo development via RawTherapee CLI. Sibling tools like 'adjust_profile', 'apply_local_preset', and 'apply_template' all modify image data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

apply_lens_correction Rate-limited

apply_lens_correction 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_lens_correction": {
      "limits": [
        {
          "counter": "apply_lens_correction_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_lens_correction

What does the apply_lens_correction tool do? +

apply_lens_correction. 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_lens_correction? +

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

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

Can I rate-limit apply_lens_correction? +

Yes. Add a rate_limit block to the apply_lens_correction 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_lens_correction completely? +

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

apply_lens_correction 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.