create_unit · Mealie MCP Server MCP: Risk & Policy

WHAT IT DOES

What create_unit does on Mealie MCP Server

AI agents use create_unit 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 create_unit needs a policy

This tool creates a new measurement unit, which is a data modification operation. It adds a new entity to the system but does not execute arbitrary code, delete data irreversibly, or involve financial transactions. The impact is limited to creating a single unit entry that can be later modified or removed.

From the tool's definition Tool name 'create_unit' and description 'Create a new measurement unit in Mealie' indicate data creation that is reversible through standard delete/update operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

create_unit Rate-limited

create_unit 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": {
    "create_unit": {
      "limits": [
        {
          "counter": "create_unit_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 create_unit

What does the create_unit tool do? +

Create a new measurement unit in Mealie. 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 create_unit? +

Register the Mealie MCP Server MCP server in PolicyLayer and add a rule for create_unit: 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 create_unit? +

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

Can I rate-limit create_unit? +

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

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

create_unit 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.