Remove a contact property by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this contact property. Reference the KEY of the property when double-checking, and warn the user that removing a contact property is irreversible and will remove the p...
AI agents call remove-contact-property to permanently remove resources in Email Sending MCP — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool irreversibly deletes contact properties across all contacts in the system. The description explicitly states the action is 'irreversible' and affects multiple records ('all contacts').
From the tool's definition Remove a contact property by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this contact property... removing a contact property is irreversible and will remove the property from all contacts.
Documented attack patterns abuse exactly the kind of access remove-contact-property gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Email Sending MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for remove-contact-property:
{
"version": "1",
"default": "deny",
"hide": [
"remove-contact-property"
]
}remove-contact-property disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.
Free to start. No card required.
Remove a contact property by ID from Resend. Before using this tool, you MUST double-check with the user that they want to remove this contact property. Reference the KEY of the property when double-checking, and warn the user that removing a contact property is irreversible and will remove the property from all contacts. You may only use this tool if the user explicitly confirms they want to remove the contact property after you double-check. It is categorised as a Destructive tool in the Email Sending MCP MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Email Sending MCP server in PolicyLayer and add a rule for remove-contact-property: 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 Email Sending MCP. Nothing to install.
remove-contact-property 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 remove-contact-property 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 remove-contact-property. 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.
remove-contact-property is provided by the Email Sending MCP server (resend/resend-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 77 Email Sending MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
77 Email Sending MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.