Using Claude Design, Claude Code, and Courier AI to Create a Multichannel Onboarding Series in 30 Minutes

A walkthrough of building a four-part multichannel onboarding series (email, in-app inbox, mobile push, and Slack) in 30 minutes using Claude Code and Cowork to orchestrate, Claude Design to mock each channel, the courier-template-builder skill to translate mocks into Elemental JSON, the Courier MCP to publish templates, and the Courier CLI to test sends. Covers the strategy behind the sequence and recommendations for anyone doing the same.