convert · Ffmpeg MCP: Risk & Policy

WHAT IT DOES

What convert does on Ffmpeg

AI agents use convert 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 convert needs a policy

The tool creates or modifies media files by converting between formats—a reversible write operation. While it processes files, it does not execute arbitrary code, delete data, or cause financial impact. The risk is medium because misuse could overwrite important media files or consume significant computational resources, but the operation itself is reversible (output can be deleted or reconverted).

From the tool's definition Tool performs format conversion which creates new media files with transformed content. Description states it 'Convert[s] media between formats' and 'Supports custom codecs', indicating file creation/modification operations.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

convert Rate-limited

convert 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": {
    "convert": {
      "limits": [
        {
          "counter": "convert_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 convert

What does the convert tool do? +

Convert media between formats (e.g., MP4→MKV, AVI→MP4, WAV→MP3, MOV→MP4). Supports custom codecs. 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 convert? +

Register the Ffmpeg MCP server in PolicyLayer and add a rule for convert: 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 convert? +

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

Can I rate-limit convert? +

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

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

convert 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.