download_subtitle · OpenSubtitles MCP Server MCP

WHAT IT DOES

What download_subtitle does on OpenSubtitles MCP Server

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

WHY IT NEEDS A POLICY

Why download_subtitle needs a policy

This tool downloads external content and writes it to the local filesystem. It creates new files on the system, which is a Write operation. It is not purely Read (it has the side effect of writing a file locally), not Execute (no code is run), and not Destructive. Severity is medium because a misused agent could fill disk space or overwrite files with arbitrary subtitle content from external sources.

From the tool's definition 'Download subtitle content by file ID' and 'Downloads in original format with force_download=true by default for direct file download'

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

download_subtitle Rate-limited

download_subtitle 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": {
    "download_subtitle": {
      "limits": [
        {
          "counter": "download_subtitle_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 OpenSubtitles MCP Server, so you can run agents against it safely.

FAQ

Questions about download_subtitle

What does the download_subtitle tool do? +

Download subtitle content by file ID. Downloads in original format with force_download=true by default for direct file download. It is categorised as a Write tool in the OpenSubtitles 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 download_subtitle? +

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

What risk level is download_subtitle? +

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

Can I rate-limit download_subtitle? +

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

Set action: deny in the PolicyLayer policy for 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 download_subtitle? +

download_subtitle is provided by the OpenSubtitles MCP Server MCP server (opensubtitles/mcp.opensubtitles.com). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.