Klaviyo Just Shipped Composer and Customer Agent. Here's What Actually Changes for Your Brand.

Klaviyo's just shipped the biggest product release since they launched their CDP. Three big swings: Composer (AI-generated campaigns from a single prompt), Customer Agent for email and WhatsApp, and a dedicated Deliverability Hub. Plus a stack of supporting features — multilingual AI in 100+ languages, personalised send time at the individual level, RCS messaging, and next-best-product recommendations in SMS and WhatsApp.

I run a Klaviyo Gold Partner agency. I've been inside the beta for parts of this. Here's the honest version of what's worth your attention and what isn't.

What Composer actually is

Composer is the headline feature. You type a prompt — "create a spring product launch campaign for high-value customers who haven't bought in 60 days" — and Composer builds the entire campaign: subject line, copy, hero image, audience segment, send-time logic.

The early version is genuinely impressive on routine campaigns. Welcome flows, replenishment emails, restock alerts. The kind of stuff that should already exist but doesn't in 70% of accounts we audit through our free Klaviyo audit process.

It is not going to replace strategists for the campaigns that matter — BFCM, brand launches, complex multi-touch flows. The output is good. It's not opinionated. And the campaigns that drive disproportionate revenue are usually the opinionated ones.

What Composer will do — and this is the actual story most agencies are missing — is collapse the time cost of running the boring 80% of email marketing. The flows that should exist but don't. The segment-specific campaigns that get skipped because nobody has time to build them.

The opportunity for brands: stop using "we don't have time" as a reason for skipping the basics. Composer killed that excuse. If you don't have a working replenishment flow, a browse abandonment sequence, a winback ladder, and segment-specific seasonal campaigns by Q4 — you'll be competing against brands who do. (If It Barks tripled email revenue in 2 months on exactly this kind of foundational rebuild — and that was before Composer existed.)

Customer Agent — the underrated launch

The release everyone's overlooking is Customer Agent moving into email and WhatsApp with handling for order tracking, order editing, subscription management, returns/exchanges, and loyalty lookup.

Why this matters: your support team's calendar is the bottleneck on a lot of retention work. Every minute your team spends answering "where's my order?" is a minute they're not spending on win-back, VIP outreach, or product Q&A that actually converts.

If you do 500+ orders/month, you're spending real money on support. Customer Agent handling 60–70% of routine tickets at near-instant response time changes that math. We're modelling it for clients now (and have been mapping the operational layer for years through our AI automation services) — for a typical Shopify brand at $2M+ ARR with a 2-person support team, the savings are real, but the bigger unlock is the second-order effect: that team starts doing the retention work they never had time for.

Important: Customer Agent is not a magic "fire your support team" button. The brands rolling it out well are using it as Tier 1 with clear escalation paths to humans for anything complex. Set it up wrong and you'll erode trust faster than a refund mistake.

Multilingual AI is a quiet game-changer for DTC

Klaviyo's Multilingual Customer Agent auto-detects and responds in 100+ languages across email, SMS, WhatsApp, and web chat. Configure once.

If you're a Shopify brand selling internationally — which is most ambitious DTC brands at this point — the friction tax on multilingual support just dropped to roughly zero. Brands that previously couldn't justify the cost of European or Latin American support now can.

This is the kind of feature that doesn't show up in the press release headline but reshapes who can compete in which markets.

The Deliverability Hub — about time

Klaviyo's new Deliverability Hub consolidates pre-built reports on engagement metrics that impact inbox placement, breakdowns by inbox provider, a detailed bounce report, and alerts when something starts trending wrong.

Why this matters: deliverability is the silent killer most brands don't even know they have. We've seen accounts post 30% YoY revenue growth with what looked like a healthy email program — but spam complaints had quietly tripled, sender reputation was decaying, and a single bad BFCM campaign would have sent the whole thing into Gmail's promotions tab for six months.

Before the Hub, monitoring this required cobbling together reports across Klaviyo's existing analytics, Google Postmaster Tools, sometimes a third-party tool like 250ok. Now it's centralised inside the same surface where you're already running email and SMS marketing.

We covered the cost of ignoring deliverability in our Phoenix case study — the moment 11,392 spam complaints hit in a single month and we had to cut a 12 million-recipient list down to its engaged core. The Hub doesn't prevent that situation. But it gives you the early warning system to catch it before it becomes a crisis. Same playbook saved Raw Rev's account from a 90-day-cold-list deliverability collapse — 0 spam complaints across a 5,633-recipient reactivation send to a dormant list.

Personalised send time at the individual level

Klaviyo's new send time AI delivers each message at the moment that individual subscriber is most likely to open, click, and buy. Not the segment. The individual.

For brands with a list larger than 50K, this matters. Send-time optimisation at the segment level was already worth 5–15% lift in opens. At the individual level — if Klaviyo's modeling holds up at scale — you're looking at meaningfully higher engagement on the same content.

One caveat: this works only if your data signal is strong enough for the AI to model. Brands with thin engagement history will see weaker results than brands with two years of click data. Build your data foundation first — that's the unglamorous prerequisite for most of what Klaviyo just shipped. (Simpli Home's 153.6% YoY revenue lift was built on exactly that — segmentation-first, send-time second.)

RCS and Next Best Product in SMS/WhatsApp

Two more worth noting:

• RCS messaging — Klaviyo now supports Rich Communication Services for Android natively. Branded sender names, rich media, interactive buttons inside the messaging app. If your audience skews Android, RCS will start outperforming plain SMS within 12 months for engagement-rate metrics.
• Next Best Product (NBP) in SMS and WhatsApp — personalised product recommendations now work in the channels where customers already shop. The conversion-rate lift on personalised SMS recommendations vs. static SMS is meaningfully higher in our test campaigns.

What we're telling clients to do this quarter

A short, prioritised list:

1. Spin up Composer for the basic flows you've been deferring. Replenishment, browse abandonment, winback, post-purchase Tier 2. Don't overthink. The point is to fill the gaps, not to win awards.
2. Pilot Customer Agent on email-only first, with a tight escalation policy. Once you trust the output, expand to WhatsApp.
3. Open the Deliverability Hub weekly. If your sender reputation is trending wrong, you want six weeks of warning, not six days.
4. Enable personalised send time on top-of-funnel campaigns first (newsletter, weekly broadcast) — the audience is broad enough for the AI to learn fast.
5. Don't disable your senior email strategist. The boring 80% just got automated. The 20% that drives disproportionate revenue still needs a human running it.

The bigger picture

What Klaviyo just shipped is the same story we're seeing across every marketing platform right now: AI is collapsing the cost of the routine 80% so the human team can focus on the strategic 20%. Brands that lean into this will free their teams to do the work that actually moves revenue. Brands that try to replace people with AI will find out the hard way that customer trust doesn't survive Tier 3 support handled by a bot.

The opportunity isn't "use AI." It's "build the operating model that pairs AI with the right humans on the right work."

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If you want context on how we approach these builds at scale, we have a Klaviyo Gold Partner agency page walking through the methodology, and our Klaviyo + email case studies show the actual outputs — from Bully Beds' $893K YoY (SMS + flow architecture) to TheLiquorStore.com's 296.9% YoY in their "dead quarter" (segmentation-first quarterly strategy).

Sources:

• Klaviyo — What's New (Spring 2026)
• Klaviyo Q1 2026 Product Updates: Composer Launch + Key Features
• 9 New Klaviyo AI Features for Autonomous Marketing & Customer Service
• Klaviyo Deliverability Hub
• Klaviyo February 2026 Product Updates