upload_user_image · Mealie MCP Server MCP: Risk & Policy

WHAT IT DOES

What upload_user_image does on Mealie MCP Server

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

WHY IT NEEDS A POLICY

Why upload_user_image needs a policy

This tool creates new image data in the Mealie system. While reversible (images can typically be deleted or replaced), it modifies user state. It does not execute arbitrary code, delete data irreversibly, or move money.

From the tool's definition Tool description states 'Upload one user's image from base64 data.' The verb 'upload' indicates creating/adding new data. The tool accepts base64 image data and persists it, modifying the user's profile/data.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

upload_user_image Rate-limited

upload_user_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": {
    "upload_user_image": {
      "limits": [
        {
          "counter": "upload_user_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 Mealie MCP Server, so you can run agents against it safely.

FAQ

Questions about upload_user_image

What does the upload_user_image tool do? +

Upload one user's image from base64 data. It is categorised as a Write tool in the Mealie MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on upload_user_image? +

Register the Mealie MCP Server MCP server in PolicyLayer and add a rule for upload_user_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 Mealie MCP Server. Nothing to install.

What risk level is upload_user_image? +

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

Can I rate-limit upload_user_image? +

Yes. Add a rate_limit block to the upload_user_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 upload_user_image completely? +

Set action: deny in the PolicyLayer policy for upload_user_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 upload_user_image? +

upload_user_image is provided by the Mealie MCP Server MCP server (nikopol666/mealie-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.