radarr_add_movie · Homelab MCP: Risk & Policy

WHAT IT DOES

What radarr_add_movie does on Homelab

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

WHY IT NEEDS A POLICY

Why radarr_add_movie needs a policy

This tool creates a new movie entry in Radarr (a movie management system) and triggers a download search, which modifies system state reversibly. While it initiates external operations (download searches), the primary action is data creation/addition rather than arbitrary code execution. The operation is reversible (the movie can be removed from Radarr), so it does not meet the Destructive threshold.

From the tool's definition Tool name 'radarr_add_movie' and description 'Add a movie to Radarr and trigger an automatic download search' indicate creation of a new entry and initiation of a download operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

radarr_add_movie Rate-limited

radarr_add_movie 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": {
    "radarr_add_movie": {
      "limits": [
        {
          "counter": "radarr_add_movie_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Homelab, so you can run agents against it safely.

FAQ

Questions about radarr_add_movie

What does the radarr_add_movie tool do? +

Add a movie to Radarr and trigger an automatic download search. It is categorised as a Write tool in the Homelab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on radarr_add_movie? +

Register the Homelab MCP server in PolicyLayer and add a rule for radarr_add_movie: 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 Homelab. Nothing to install.

What risk level is radarr_add_movie? +

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

Can I rate-limit radarr_add_movie? +

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

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

radarr_add_movie is provided by the Homelab MCP server (nainounen/homelab-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.