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Lifecycle email is the workhorse of B2B marketing — and the place that scales worst with headcount. A lifecycle Agent drafts the sequences that match each segment, lifecycle stage, and trigger so you can run more campaigns without copying templates into Google Docs.

When this pays off

Lifecycle is templated

You’re copy-pasting “Welcome Series v3” docs between every product launch instead of running per-launch sequences.

Trigger moments are missed

Trial ending, contract renewing, feature unused — these moments deserve sequences and currently get nothing.

Brand voice drift

Different team members write each campaign and the voice has slipped across them.

Re-engagement is overdue

A dormant-list re-engagement campaign keeps getting deprioritized because the copy work is the bottleneck.

The shape of this use case

A lifecycle Agent takes a segment + trigger and returns a multi-step email sequence in your voice.

Inputs

Segment definition, lifecycle stage, triggering event, campaign goal.

Sources

Brand voice docs, past-campaign copy, persona definitions, product positioning, your marketing automation platform.

Output

A drafted sequence — subject lines, body copy, send timing, CTA per step — ready for review.

Delivery

Drafted into HubSpot or Marketo for review, written to a doc for marketing approval, queued in your ESP.

Where to start

Two ways in, depending on whether you want something running today or built to your exact spec.

Clone a pre-built Agent

Build your own

Start from scratch in the builder, or by describing it in Claude Code or Cursor with Programmatic GTM.
Either way, these are prompts your team can use on day one:
  • “Draft a 4-step welcome series for new free-trial users in HubSpot — friendly tone, focus on activating the dashboard feature.”
  • “Write a re-engagement sequence for trial users who haven’t logged in for 30 days.”
  • “Give me a 3-touch renewal sequence for accounts in the 90-day renewal window.”

Where to take it

Once it’s running, deepen it in three moves:

Give it a playbook

Shape it with a prompt, your brand voice in Knowledge, and Bulk Schedule.

Automate it on signals

Wrap it in a workflow that fires on a trigger.

Let it improve

Feed opens, clicks, and conversion back into the Agent’s evals so drafts track what converts.

Common pitfalls

Without persona-specific Knowledge, every sequence reads like a watered-down version of the welcome email. Upload distinct persona docs and force the prompt to reference them.
The HubSpot trigger fires on the wrong field and the sequence drafts the wrong campaign. Gate triggers tightly and review what actually causes them to fire in week one.
A prompt tweak changes tone everywhere. Use evals on a few canonical drafts to catch drift before it ships to subscribers.
Tempting to skip marketing approval and queue directly. Don’t — one bad subject line in production costs trust. Gate L3 with a Slack approval until you’ve watched it run for a quarter.