pt_unsubscribe

THE RISK

Medium Risk

Why pt_unsubscribe needs a policy

Unsubscribing from a channel modifies subscription/membership state. This is reversible (one can re-subscribe), so it falls under Write rather than Destructive. Misuse could disrupt communication channels for an AI agent managing project collaborations.

From the tool's definition Unsubscribe from a channel

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

POLICY

How to control pt_unsubscribe

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 pt_unsubscribe:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "pt_unsubscribe": {
      "limits": [
        {
          "counter": "pt_unsubscribe_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

pt_unsubscribe stays usable, but capped — an agent stuck in a loop can't make hundreds of changes 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about pt_unsubscribe

What does the pt_unsubscribe tool do? +

Unsubscribe from a channel. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on pt_unsubscribe? +

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

pt_unsubscribe is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit pt_unsubscribe? +

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

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

pt_unsubscribe 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 →