speed · Ffmpeg MCP: Risk & Policy

WHAT IT DOES

What speed does on Ffmpeg

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

WHY IT NEEDS A POLICY

Why speed needs a policy

This tool creates or modifies media files by altering playback speed—a reversible transformation. It does not delete data (Destructive), execute arbitrary code (Execute), involve financial transactions (Financial), or merely read data (Read).

From the tool's definition Tool modifies media playback speed, creating a new output file with altered temporal characteristics. Description states it 'change[s] playback speed' with a range from 0.25x to 4x, indicating file transformation rather than inspection.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

speed Rate-limited

speed 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": {
    "speed": {
      "limits": [
        {
          "counter": "speed_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 Ffmpeg, so you can run agents against it safely.

FAQ

Questions about speed

What does the speed tool do? +

Change playback speed of video and audio (0.25x slow-mo to 4x fast forward). It is categorised as a Write tool in the Ffmpeg MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on speed? +

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

What risk level is speed? +

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

Can I rate-limit speed? +

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

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

speed is provided by the Ffmpeg MCP server (yuan66-hub/ffmpeg-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.