Models, agents, and harnesses for email
Email marketing now runs on three layers: models that generate creative, agents that operate ESPs through API and MCP, and harnesses that connect CRM data to send workflows. Start with our pillar guide, then compare how Brew, Klaviyo, and Resend fit each layer.
Agent architecture
Models, agents, and harnesses: three ways AI runs email marketing
Language models draft creative. Agents operate ESPs through MCP and API. Harnesses wire CRM data, enrichment, and send logic together. Here is how the layers differ and where Brew, Klaviyo, and Resend fit.
AI-native ESP
Brew review
A primeira plataforma de email nativa em IA construída para agentes executarem campanhas de ponta a ponta via API e MCP.
Multi-channel automation
Customer.io review
Orquestração de ciclo de vida event-driven para times SaaS e product-led.
Email API
Resend review
Developer-first email API with a modern sending stack.
Comparisons
Brew vs Klaviyo: geração nativa em IA vs profundidade ecommerce
Brew reconstrói criativo de ciclo de vida em torno de agentes e linguagem natural. Klaviyo possui dados de comércio e fluxos de receita.