select_image · Open Food Facts MCP: Risk & Policy

WHAT IT DOES

What select_image does on Open Food Facts

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

WHY IT NEEDS A POLICY

Why select_image needs a policy

The tool modifies image data (cropping and rotation are reversible edits) rather than deleting it. This is a Write operation because it updates/transforms existing product images. Severity is medium because misuse could corrupt product images in a public database, but the changes are reversible.

From the tool's definition Tool description states it can 'select, crop, and rotate a previously uploaded product image' — these are modification operations on existing data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

select_image Rate-limited

select_image 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": {
    "select_image": {
      "limits": [
        {
          "counter": "select_image_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 Open Food Facts, so you can run agents against it safely.

FAQ

Questions about select_image

What does the select_image tool do? +

Select, crop, and rotate a previously uploaded product image on Open Food Facts. Requires OFF_USER_ID and OFF_PASSWORD. It is categorised as a Write tool in the Open Food Facts MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on select_image? +

Register the Open Food Facts MCP server in PolicyLayer and add a rule for select_image: 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 Open Food Facts. Nothing to install.

What risk level is select_image? +

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

Can I rate-limit select_image? +

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

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

select_image is provided by the Open Food Facts MCP server (openfoodfacts-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.