Seven chapters. The 4-agent architecture (Segmenter → Writer → Sender → Optimizer). The agent-to-agent inbox reality. AI-SMS compliance under TX SB 140 + VA SB 1339. Plus the bonus chapter for the brands still rebuilding after Yotpo Email/SMS sunset Dec 31, 2025.
7
chapters · ~12,000 words
Source-cited throughout
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Every chapter cites at least one primary source (Klaviyo newsroom, Litmus, Red Sift, Varnum LLP, BusinessWire, the VA LIS, the Texas AG settlement) and at least one numerical benchmark.
Why 2026 is the inflection point. Composer + Customer Agent + MCP + Klaviyo Personalized Send Time as evidence of the platform admitting the future.
Segmenter → Writer → Sender → Optimizer. JSON contract handoffs. The 4 human-in-the-loop checkpoints that prevent silent failure.
Gmail / Yahoo / Apple AI rewrite your subject lines and preheaders. Open rate is dead. What to measure instead — and why BIMI is the highest-ROI deliverability move.
TX SB 140 (Sept 1, 2025) + AG settlement. VA SB 1339 (Jan 1, 2026) 10-year STOP retention. T-Mobile's $10K SHAFT fines. The kill-switch policy.
Klaviyo's 500+180-day eligibility vs the 1,500-customer trust floor. The 3 failure modes. The CLV-cohort alternative for early stages.
This is for you if...
This is NOT for you if...
Seven chapters, source-cited, distilled from the operators who actually shipped Composer + Customer Agent rollouts in Q2 2026.
The 7 most common post-migration failure modes. The 30/60/90 day remediation plan. Why the first BFCM post-migration is a controlled rebuild, not a velocity sprint.
The 6 governance layers. The 6 auto-kill triggers. The 'human-of-record' policy. Why brands that win 2026–2027 look light on AI adoption and heavy on AI governance.
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