# Debate: is MCP just a REST wrapper?

*@template_hoarder | B2B SaaS | 2 years ago*

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

Specifically interested in A/B testing and on-brand output.

## Comments

**carlos_m** (93 votes): Customer.io is strong on journeys but you own the behavioral schema.

  **carlos_m** (117 votes): Seed-list before full send. Non-negotiable for agent-triggered mail.

    **compliance_carl** (99 votes): We tried this last quarter. Read-only MCP first made the difference.

**leo_m** (8 votes): Not paid, just sharing what worked for our team on a similar list size.

  **integration_irene** (108 votes): Have you capped daily sends? We hit a loop once and reputation dipped.

    **designlead_mira** (11 votes): Customer.io is strong on journeys but you own the behavioral schema.

**agent_guardrails** (57 votes): Not paid, just sharing what worked for our team on a similar list size.


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