preview_exposure_bracket · Rawtherapee MCP: Risk & Policy

WHAT IT DOES

What preview_exposure_bracket does on Rawtherapee

AI agents invoke preview_exposure_bracket to trigger actions in Rawtherapee. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why preview_exposure_bracket needs a policy

This tool executes multiple rendering/processing operations through the RawTherapee CLI to generate bracketed exposure previews. It is not purely reading existing data (it actively renders images), nor is it writing/modifying stored settings in a reversible structured way. It triggers external compute operations whose outputs depend on arguments, placing it in the Execute category.

From the tool's definition 'Simulate exposure bracketing by rendering multiple EV previews' — triggers multiple rendering operations via RawTherapee CLI

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

preview_exposure_bracket Rate-limited

preview_exposure_bracket 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.

View as policy code

policy.json

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

RATE-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 preview_exposure_bracket

What does the preview_exposure_bracket tool do? +

Simulate exposure bracketing by rendering multiple EV previews. It is categorised as a Execute tool in the Rawtherapee MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on preview_exposure_bracket? +

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

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

Can I rate-limit preview_exposure_bracket? +

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

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

preview_exposure_bracket 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.