resize_video · FFmpeg MCP Tool MCP: Risk & Policy

WHAT IT DOES

What resize_video does on FFmpeg MCP Tool

AI agents use resize_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 resize_video needs a policy

Resizing a video creates or overwrites a modified version of the file. This is a Write operation as it modifies media data. It is not Destructive because the original is typically preserved, not irreversibly deleted. Severity is medium because misuse could overwrite important video files or produce unintended output dimensions, but the blast radius is limited to media files.

From the tool's definition Tool name 'resize_video' and description '调整视频尺寸' (meaning 'adjust video dimensions/size') indicate a transformation/modification operation on video files.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

resize_video Rate-limited

resize_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": {
    "resize_video": {
      "limits": [
        {
          "counter": "resize_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 resize_video

What does the resize_video tool do? +

调整视频尺寸. 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 resize_video? +

Register the FFmpeg MCP Tool MCP server in PolicyLayer and add a rule for resize_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 resize_video? +

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

Can I rate-limit resize_video? +

Yes. Add a rate_limit block to the resize_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 resize_video completely? +

Set action: deny in the PolicyLayer policy for resize_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 resize_video? +

resize_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.