AI agents call excel_delete_worksheet to permanently remove resources in Sage MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Deleting a worksheet removes data that cannot be recovered without external backups. This is an irreversible destructive action that meets the criteria for the Destructive category (delete operation). While the blast radius is somewhat contained to a single worksheet rather than an entire workbook, the permanent data loss justifies 'high' severity.
From the tool's definition The tool name and description explicitly state 'Delete a worksheet' - the delete operation on a workbook component is irreversible data destruction.
Documented attack patterns abuse exactly the kind of access excel_delete_worksheet gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sage MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for excel_delete_worksheet:
{
"version": "1",
"default": "deny",
"hide": [
"excel_delete_worksheet"
]
}excel_delete_worksheet 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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Delete a worksheet (tab) from a workbook. It is categorised as a Destructive tool in the Sage MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Sage MCP server in PolicyLayer and add a rule for excel_delete_worksheet: 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 Sage MCP. Nothing to install.
excel_delete_worksheet 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 excel_delete_worksheet 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 excel_delete_worksheet. 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.
excel_delete_worksheet is provided by the Sage MCP server (sagemcp/sagemcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 359 Sage MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
359 Sage MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.