crow_room_close

THE RISK

Medium Risk

Why crow_room_close needs a policy

This tool modifies the state of a project management/collaboration resource (closing a room, invalidating tokens) but does not permanently delete underlying data. The action is reversible through reopening or recreating the room. The blast radius is medium: a malicious actor could disrupt ongoing collaboration and communications within a room, but the core project data and memories appear to persist.

From the tool's definition Tool closes/invalidates an active companion room and optionally notifies participants. The description uses 'close' and 'invalidates,' indicating it modifies the state of a shared collaboration space.

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

POLICY

How to control crow_room_close

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 crow_room_close:

policy.json

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

crow_room_close 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 →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_room_close

What does the crow_room_close tool do? +

Close an active companion room. Invalidates the room token and optionally notifies participants. 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 crow_room_close? +

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

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

Can I rate-limit crow_room_close? +

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

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

crow_room_close 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 →