Delete one or more contacts by ID.
AI agents call contacts_delete_contact to permanently remove resources in Pyfastmail — typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.
This tool permanently removes contact records from the user's account. Deletion is an irreversible operation that cannot be undone (unlike updates which are reversible writes). While not financial, the loss of contact information could have significant consequences for the user. The blast radius is high if an AI agent mistakenly deletes contacts en masse or targets contacts belonging to important relationships.
From the tool's definition Tool name is 'contacts_delete_contact' and description states 'Delete one or more contacts by ID.' The verb 'delete' indicates irreversible removal of data.
Attacks that exploit this kind of access
Delete one or more contacts by ID. It is categorised as a Destructive tool in the Pyfastmail MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Register the Pyfastmail MCP server in PolicyLayer and add a rule for contacts_delete_contact: 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 Pyfastmail. Nothing to install.
contacts_delete_contact 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 contacts_delete_contact 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 contacts_delete_contact. 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.
contacts_delete_contact is provided by the Pyfastmail MCP server (pjosols/pyfastmail-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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