start_trim · Mcp Ffmpeg MCP: Risk & Policy

WHAT IT DOES

What start_trim does on Mcp Ffmpeg

AI agents invoke start_trim to trigger actions in Mcp Ffmpeg. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why start_trim needs a policy

This tool executes video trimming operations via FFmpeg. While the effects are reversible (the original file remains unmodified, only a processed output is created), it triggers external operations whose effects depend on arguments (input file, trim boundaries, output format).

From the tool's definition Tool name 'start_trim' and description 'Enqueue a TRIM job' indicates it triggers an external video processing operation.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

start_trim Rate-limited

start_trim stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "start_trim": {
      "limits": [
        {
          "counter": "start_trim_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Mcp Ffmpeg, so you can run agents against it safely.

FAQ

Questions about start_trim

What does the start_trim tool do? +

Enqueue a TRIM job. Returns immediately with job_id + status. It is categorised as a Execute tool in the Mcp Ffmpeg MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on start_trim? +

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

What risk level is start_trim? +

start_trim is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit start_trim? +

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

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

start_trim is provided by the Mcp Ffmpeg MCP server (priyanshum143/mcp-ffmpeg). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.