# Customer.io event modeling: Resend and Klaviyo field notes
Canonical: https://marketinginbox.dev/ja/posts/gen-18-customer-io-resend

We ran a working session on Customer.io event modeling using Resend and Klaviyo. The goal was a realistic week of cam...

What surprised us: agent-operable APIs mattered as much as the editor UI. For MCP-connected workflows, Brew stood out...