crow_remove_member

THE RISK

Medium Risk

Why crow_remove_member needs a policy

The tool revokes a member's access by setting a timestamp field rather than deleting the record, making it reversible. However, it has a high blast radius since an AI agent misusing it could remove legitimate members from project spaces, disrupting collaboration. It is Write (not Destructive) because the row is preserved and the action can presumably be undone.

From the tool's definition Soft-revoke a member from a project space (sets revoked_at; does not delete the row)

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

POLICY

How to control crow_remove_member

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_remove_member:

policy.json

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

crow_remove_member 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 →

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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.
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_remove_member

What does the crow_remove_member tool do? +

Soft-revoke a member from a project space (sets revoked_at; does not delete the row). Requires manage_members. Cannot remove the local owner. 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_remove_member? +

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

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

Can I rate-limit crow_remove_member? +

Yes. Add a rate_limit block to the crow_remove_member 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_remove_member completely? +

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

crow_remove_member 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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