Critical-risk tools in Resend

Critical severity Resend MCP Server 6 of 44 tools

6 of the 44 tools in Resend 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

cancel-email Destructive

Cancel a scheduled email
remove-api-key Destructive

Remove an API key
remove-broadcast Destructive

Remove a broadcast campaign
remove-contact Destructive

Remove a contact from an audience
remove-segment Destructive

Remove an audience segment
remove-topic Destructive

Remove a subscription topic

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 Resend

Tools at critical risk

Attacks that target this class

More on Resend

Let agents act without letting them run wild.