Beehiiv New Subscriber Agent with Codex

Look the subscriber up, read the UTM values and the referring site, apply tags, write two or three custom fields, and usually say nothing. That is API-shaped work with a short and obvious ending, which is the kind of job Codex finishes quickly and without ceremony.
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Free to start · guided setup · switch agents any time.

Live demo

Watch it work before it's live

Run a staged conversation — no account needed. The agent handles it for real while a simulated world answers its tool calls; nothing touches real accounts, and nothing is actually sent.

New subscriber

hanna.lindqvist@northvolt-supply.seThe Grid Weekly

Free tier. utm_source=partner-swap, utm_campaign=aug-crosspost, referring site theampereletter.com. Signed up 07:41 CEST on mobile and confirmed the double opt in four minutes later. Her email domain matches a company already listed on the sponsor prospect sheet.

What you'll need

Set up in minutes

Using this template drops you into a guided setup. It asks exactly this, nothing else:

  1. Connect beehiiv

    One sign-in. The agent acts through your account, scoped to what this template uses.

  2. Connect Slack

    One sign-in. The agent acts through your account, scoped to what this template uses.

  3. Tagging rules

    Which tags go on a signup and where each one comes from, the custom fields worth filling from the subscription record, and what makes a subscriber notable enough to interrupt someone for, usually a company domain you sell to or anyone on a paid plan.

  4. Runs on Codex

    Preselected for this page — connect your Codex account during setup, or switch to NoClick's built-in models with one click.

  5. Watch it handle a test run

    A staged conversation against a simulated world — then it’s live.

A considered pairing

Why Codex for this agent

Record in, tags out

Everything the agent needs is on the subscription record and everything it does is a small write back to beehiiv. In the common case there is nothing to reason about.

Three facts, three tags

Source, referrer and tier stay separate rather than collapsing into one blended label. Keeping fields apart is precision work rather than interpretation.

Good to know

Before you fork

Can it move somebody between tiers or remove them?

No. The workflow holds tagging and custom field writes and nothing else, so status changes, tier moves, deletions and sending are absent rather than merely forbidden. That matters more here than in most templates, because billing sits behind the tier field and an agent with no reach into it cannot start a refund conversation.

Other editions

Run it with a different agent

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Make it yours

Put Beehiiv New Subscriber Agent to work on Codex.

Free to start. Guided setup, a staged test run, and a workflow you can change at every step.