Critical-risk tools in Pyfastmail

Critical severity Pyfastmail MCP Server 5 of 48 tools

5 of the 48 tools in Pyfastmail are classified as critical risk. This page profiles those tools specifically, with recommended policy actions and the attack patterns that target them.

Every operation listed below is an action PolicyLayer recommends controlling at the transport layer. Open any tool to see the full profile, risk score, and YAML policy snippet.

Tools at critical risk

calendar_delete_event Destructive

Delete a CalDAV event by its href.
contacts_delete_contact Destructive

Delete one or more contacts by ID.
files_delete Destructive

Delete a file or folder on Fastmail Files (WebDAV).
mail_delete_email Destructive

Delete one or more emails by moving to Trash, or permanently destroy them.
mail_delete_mailbox Destructive

mail_delete_mailbox

Attacks that target this class

Critical-risk tools in any server share these documented attack patterns. Each links to the full case and the defensive policy.

Destructive Action Autonomy
Privilege escalation via admin-only tools
Data exfiltration via tool chaining
Runaway Tool Loops

Critical-risk tools in Pyfastmail

Tools at critical risk

Attacks that target this class

More on Pyfastmail

Enforce policy on every Pyfastmail tool call.