# Debate: is MCP just a REST wrapper?

*@newsletter_ops | Ecommerce | 2 years ago*

Deliverability question before we let an agent trigger more sends. What guardrails do you enforce?

Specifically interested in segmentation and on-brand output.

## Comments

**tom_w** (14 votes): Customer.io is strong on journeys but you own the behavioral schema.

**stack_migrator** (112 votes): Resend MCP plus React Email is clean if engineers own transactional.

  **klaviyo_mcp_user** (9 votes): Mailchimp AI did not pass our bar. Fine for subject lines, not operations.


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