generate-subtitles · Video Toolkit MCP: Risk & Policy

WHAT IT DOES

What generate-subtitles does on Video Toolkit

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

WHY IT NEEDS A POLICY

Why generate-subtitles needs a policy

The tool creates subtitle files (SRT/VTT) which are new data artifacts written to the filesystem. This is reversible (files can be deleted) and has no destructive, financial, or code execution implications. Severity is medium because the tool processes local files and creates output, but the blast radius is limited to subtitle file generation without side effects on the source video or external systems.

From the tool's definition The tool "generates subtitles for a local video file" and "creates an SRT or VTT file alongside the video." This is a write operation that creates new files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

generate-subtitles Rate-limited

generate-subtitles 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": {
    "generate-subtitles": {
      "limits": [
        {
          "counter": "generate-subtitles_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 Video Toolkit, so you can run agents against it safely.

FAQ

Questions about generate-subtitles

What does the generate-subtitles tool do? +

Generate subtitles for a local video file using AI speech-to-text (OpenAI Whisper or local whisper). Creates an SRT or VTT file alongside the video. It is categorised as a Write tool in the Video Toolkit MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on generate-subtitles? +

Register the Video Toolkit MCP server in PolicyLayer and add a rule for generate-subtitles: 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 Video Toolkit. Nothing to install.

What risk level is generate-subtitles? +

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

Can I rate-limit generate-subtitles? +

Yes. Add a rate_limit block to the generate-subtitles 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 generate-subtitles completely? +

Set action: deny in the PolicyLayer policy for generate-subtitles. 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 generate-subtitles? +

generate-subtitles is provided by the Video Toolkit MCP server (jamesanz/transcript-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.