crow_glasses_undo_last_append

THE RISK

Critical Risk

Why crow_glasses_undo_last_append needs a policy

This tool irreversibly removes data (deletes the most recently appended line) from a note session. While it could be argued as a reversible undo operation, it permanently removes content from the record with no described recovery mechanism, making it Destructive. Severity is medium as it affects only the last line of a single note session.

From the tool's definition Remove the most recently appended line from an active glasses note session

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

POLICY

How to control crow_glasses_undo_last_append

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_glasses_undo_last_append:

policy.json

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

crow_glasses_undo_last_append 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.

RESTRICT THIS TOOL →

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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.
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FAQ

Questions about crow_glasses_undo_last_append

What does the crow_glasses_undo_last_append tool do? +

Remove the most recently appended line from an active glasses note session. Use when the user says. 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 crow_glasses_undo_last_append? +

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

crow_glasses_undo_last_append 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 crow_glasses_undo_last_append? +

Yes. Add a rate_limit block to the crow_glasses_undo_last_append 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_glasses_undo_last_append completely? +

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

crow_glasses_undo_last_append 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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