bazarr_download_subtitle · Homelab MCP: Risk & Policy

WHAT IT DOES

What bazarr_download_subtitle does on Homelab

AI agents invoke bazarr_download_subtitle to trigger actions in Homelab. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why bazarr_download_subtitle needs a policy

This tool triggers an external operation (subtitle download) in the Bazarr media management system. It causes a side effect by initiating a network download and writing subtitle files to the filesystem. It spans Write and Execute categories; Execute is more appropriate since it triggers an external operation whose effects depend on arguments (which movie/episode to download subtitles for).

From the tool's definition Trigger a manual subtitle download for a specific movie or episode in Bazarr

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

bazarr_download_subtitle Rate-limited

bazarr_download_subtitle stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "bazarr_download_subtitle": {
      "limits": [
        {
          "counter": "bazarr_download_subtitle_rate",
          "window": "minute",
          "max": 10,
          "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 bazarr_download_subtitle

What does the bazarr_download_subtitle tool do? +

Trigger a manual subtitle download for a specific movie or episode in Bazarr. It is categorised as a Execute tool in the Homelab MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on bazarr_download_subtitle? +

Register the Homelab MCP server in PolicyLayer and add a rule for bazarr_download_subtitle: 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 bazarr_download_subtitle? +

bazarr_download_subtitle is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit bazarr_download_subtitle? +

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

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

bazarr_download_subtitle 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.