mealie_units_merge · Mealie MCP Server MCP: Risk & Policy

WHAT IT DOES

What mealie_units_merge does on Mealie MCP Server

AI agents use mealie_units_merge 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 mealie_units_merge needs a policy

The merge operation updates multiple records across recipes to consolidate unit definitions. While reversible (the original units could theoretically be separated again), it modifies data structure and affects multiple dependent records. This is a Write operation rather than Destructive because the data itself is not deleted, merely consolidated.

From the tool's definition Tool description states 'Merge one unit into another (combines usage across recipes)' — this modifies the database by consolidating unit records and updating all recipe references, which is a reversible write operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

mealie_units_merge Rate-limited

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

FAQ

Questions about mealie_units_merge

What does the mealie_units_merge tool do? +

Merge one unit into another (combines usage across recipes). 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 mealie_units_merge? +

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

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

Can I rate-limit mealie_units_merge? +

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

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

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