maker_revoke_batch

THE RISK

Critical Risk

Why maker_revoke_batch needs a policy

Revoking sessions is an irreversible operation that terminates active user sessions and access. While admin-only and logged, the batch nature and inability to undo the revocation of potentially many sessions classifies this as Destructive rather than Write. High severity due to potential impact on multiple users' access and disruption to ongoing work.

From the tool's definition Tool name 'revoke_batch' and description 'Revoke every session in a batch' indicates irreversible revocation of multiple sessions.

Risk signalsBulk/mass operation — affects multiple targets · Admin/system-level operation

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

POLICY

How to control maker_revoke_batch

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 maker_revoke_batch:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "maker_revoke_batch"
  ]
}

maker_revoke_batch disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

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EXPLORE

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Go deeper

Critical-risk tools in Crow → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about maker_revoke_batch

What does the maker_revoke_batch tool do? +

Revoke every session in a batch (use when a printed QR sheet is lost). Admin-only. Requires a reason (logged). It is categorised as a Destructive tool in the Crow MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on maker_revoke_batch? +

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

maker_revoke_batch is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit maker_revoke_batch? +

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

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

maker_revoke_batch 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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