Cut lines from file to buffer (copy and delete from source)
AI agents call buffer_cut to permanently remove resources in Clippy — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool performs an irreversible deletion of file content (the 'cut' operation removes lines from the source file). Although the content is placed in a buffer, the original data is permanently removed from the file. This is a destructive operation that cannot be undone by the tool itself.
From the tool's definition 'Cut lines from file to buffer (copy and delete from source)' - the tool irreversibly deletes content from the source file as part of its operation.
Documented attack patterns abuse exactly the kind of access buffer_cut gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Clippy, and nothing reaches the server without passing your rules. This is the rule we recommend for buffer_cut:
{
"version": "1",
"default": "deny",
"hide": [
"buffer_cut"
]
}buffer_cut disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
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Cut lines from file to buffer (copy and delete from source). It is categorised as a Destructive tool in the Clippy MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Clippy MCP server in PolicyLayer and add a rule for buffer_cut: 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 Clippy. Nothing to install.
buffer_cut is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the buffer_cut 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.
Set action: deny in the PolicyLayer policy for buffer_cut. 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.
buffer_cut is provided by the Clippy MCP server (neilberkman/clippy). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Clippy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
7 Clippy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.