fw_pause

THE RISK

High Risk

Why fw_pause needs a policy

This tool triggers an external operation (pausing audio playback on a hardware device). It is reversible (can be resumed), so it does not qualify as Destructive. It controls an external device/system, making it Execute. The blast radius is low as it only affects audio playback on glasses.

From the tool's definition Pause the currently-playing audio stream on the glasses. Playback can be resumed with fw_resume.

Documented attack patterns abuse exactly the kind of access fw_pause gives an agent:

POLICY

How to control fw_pause

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for fw_pause:

policy.json

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

fw_pause 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.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
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FAQ

Questions about fw_pause

What does the fw_pause tool do? +

Pause the currently-playing audio stream on the glasses. Playback can be resumed with fw_resume. It is categorised as a Execute tool in the Crow MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on fw_pause? +

Register the Crow MCP server in PolicyLayer and add a rule for fw_pause: 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 Crow. Nothing to install.

What risk level is fw_pause? +

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

Can I rate-limit fw_pause? +

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

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

fw_pause is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →