pause_playback · MCP Media Server MCP: Risk & Policy

WHAT IT DOES

What pause_playback does on MCP Media Server

AI agents invoke pause_playback to trigger actions in MCP Media Server. 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 pause_playback needs a policy

While the action is reversible and non-destructive, it executes a command against an external application (MPV media player) whose behavior depends on the current playback state. This fits the Execute category: 'runs code, shell commands, browser actions, or triggers external operations.' The severity is low because pausing/unpausing media has minimal blast radius and no persistent side effects.

From the tool's definition The tool 'pause_playback' toggles playback state in MPV, which is an external media player application. The description states it 'Pause or unpause the currently playing video in MPV,' indicating execution of a system operation that triggers external behavior.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

pause_playback Rate-limited

pause_playback 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": {
    "pause_playback": {
      "limits": [
        {
          "counter": "pause_playback_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 Media Server, so you can run agents against it safely.

FAQ

Questions about pause_playback

What does the pause_playback tool do? +

Pause or unpause the currently playing video in MPV. Toggles between pause and play. It is categorised as a Execute tool in the MCP Media Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on pause_playback? +

Register the MCP Media Server MCP server in PolicyLayer and add a rule for pause_playback: 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 Media Server. Nothing to install.

What risk level is pause_playback? +

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

Can I rate-limit pause_playback? +

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

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

pause_playback is provided by the MCP Media Server MCP server (neal3000/mcp_media_server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.