prev_video · Social Video MCP: Risk & Policy

WHAT IT DOES

What prev_video does on Social Video

AI agents invoke prev_video to trigger actions in Social Video. 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 prev_video needs a policy

This tool triggers an external operation on a native mpv player window, controlling playback state by navigating to the previous video. It executes a media player action rather than simply reading data or writing/modifying stored data. The blast radius is low as it only affects local video playback.

From the tool's definition Go back to the previous video in the current playlist

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

prev_video Rate-limited

prev_video 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": {
    "prev_video": {
      "limits": [
        {
          "counter": "prev_video_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 Social Video, so you can run agents against it safely.

FAQ

Questions about prev_video

What does the prev_video tool do? +

Go back to the previous video in the current playlist. It is categorised as a Execute tool in the Social Video MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on prev_video? +

Register the Social Video MCP server in PolicyLayer and add a rule for prev_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 Social Video. Nothing to install.

What risk level is prev_video? +

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

Can I rate-limit prev_video? +

Yes. Add a rate_limit block to the prev_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 prev_video completely? +

Set action: deny in the PolicyLayer policy for prev_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 prev_video? +

prev_video is provided by the Social Video MCP server (ronantakizawa/social-video-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.