emailrules_delete
AI agents call emailrules_delete to permanently remove resources in M365 — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
Email rules are data that govern mail filtering and organization. Deleting them is irreversible and cannot be undone through normal operations. This falls squarely into the Destructive category. While the description is empty (lowering confidence slightly), the tool name itself is sufficiently explicit.
From the tool's definition Tool name 'emailrules_delete' explicitly indicates deletion functionality. The 'delete' verb combined with 'emailrules' context indicates irreversible removal of email rules that users have configured.
Attacks that exploit this kind of access
emailrules_delete. It is categorised as a Destructive tool in the M365 MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the M365 MCP server in PolicyLayer and add a rule for emailrules_delete: 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 M365. Nothing to install.
emailrules_delete 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 emailrules_delete 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 emailrules_delete. 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.
emailrules_delete is provided by the M365 MCP server (robin-collins/m365-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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