compress_video · FFmpeg MCP Tool MCP: Risk & Policy

WHAT IT DOES

What compress_video does on FFmpeg MCP Tool

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

WHY IT NEEDS A POLICY

Why compress_video needs a policy

Compressing a video file creates or overwrites output data. This is a Write operation (creates a new compressed file or modifies in place). It is not Destructive in the irreversible sense unless it overwrites the original, but the primary action is producing a modified file. Severity is medium because misuse could result in loss of video quality or unintended overwriting of media files.

From the tool's definition compress_video / 压缩单个视频文件 — compresses a single video file, modifying/overwriting the media data

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compress_video Rate-limited

compress_video 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": {
    "compress_video": {
      "limits": [
        {
          "counter": "compress_video_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 MCP Tool, so you can run agents against it safely.

FAQ

Questions about compress_video

What does the compress_video tool do? +

压缩单个视频文件. It is categorised as a Write tool in the FFmpeg MCP Tool MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on compress_video? +

Register the FFmpeg MCP Tool MCP server in PolicyLayer and add a rule for compress_video: 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 MCP Tool. Nothing to install.

What risk level is compress_video? +

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

Can I rate-limit compress_video? +

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

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

compress_video is provided by the FFmpeg MCP Tool MCP server (lbjwt/ffmpeg-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.