fw_playlists

THE RISK

Low Risk

Why fw_playlists needs a policy

This tool retrieves information about the authenticated user (likely playlists or user data), which is a read-only operation. There is no indication of modification, deletion, execution, or financial impact. The blast radius is low since it only returns user-specific information that the authenticated user should have access to.

From the tool's definition Tool name 'fw_playlists' and description 'List the authenticated user' indicate data retrieval with no modification or side effects.

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

POLICY

How to control fw_playlists

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_playlists:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "fw_playlists": {}
  }
}

fw_playlists is read-only, so it stays allowed — but 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.

CAP THIS TOOL →

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EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about fw_playlists

What does the fw_playlists tool do? +

List the authenticated user. It is categorised as a Read tool in the Crow MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on fw_playlists? +

Register the Crow MCP server in PolicyLayer and add a rule for fw_playlists: 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_playlists? +

fw_playlists is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit fw_playlists? +

Yes. Add a rate_limit block to the fw_playlists 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_playlists completely? +

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

fw_playlists 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.

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