Custom AI

Use case: a Newsletter Writer that knows your newsletter

Build a Custom AI around your past issues, your voice, and your ideas board — then never re-explain your newsletter to an AI again.

·5 min read

Every time you ask a generic AI for help with your newsletter, you spend the first ten minutes re-explaining it: who it's for, how it's structured, how you sound. A Newsletter Writer Custom AI makes that explanation permanent. Open a chat and it already knows — you start at the actual work.

This is the clearest everyday case for a narrowed context: your newsletter is a small, specific world, and the AI helping you write it should live entirely inside that world.

What to build

Create a Custom AI called Newsletter Writer and connect:

  • Past issues — your best 5–10, as saved items or a board. This teaches structure and standard, not just style.
  • Your voice profile — the document from your voice Custom AI, so drafts come out in your cadence.
  • Your ideas board — the running list of things you might write about, as a live source. Add ideas all week; the AI sees them at writing time.
  • One or two inspiration creators — newsletter writers you admire, attached as an ideas reference.

Then instructions that encode your format, for example:

Help me write my weekly newsletter for [audience]. Structure: hook, one core idea developed deeply, one practical application, soft CTA. 800–1,200 words. Always propose three angles before drafting. Never use hashtags or emoji.

Add starters like "Propose three angles from my ideas board" and "Draft the next issue".

The weekly rhythm

  1. 01

    Angles first

    Open the Newsletter Writer and tap "Propose three angles". It reads your ideas board and recent issues, and suggests directions that don't repeat what you just published.

  2. 02

    Draft

    Pick an angle and ask for a draft. The context line under the reply shows which past issues and notes it drew from — click through if something reads off.

  3. 03

    Edit in your voice

    Push back the way you would with an editor: "the hook is weak", "tighten section two". It keeps your voice profile in play the whole time.

Every issue's conversation collects on the Custom AI's page, so "what did we decide about the October series?" is a scroll away, not lost in a generic chat list.

Variations

  • Marketers: the same build works per client — see one Custom AI per client.
  • Podcasters and YouTubers: swap past issues for transcripts and outlines; the pattern is identical.
Related articles

Connecting knowledge to a Custom AI

Attach boards, notes, files, links, and creators. Live sources stay current on their own, and every answer shows you exactly which sources it used.

Building a voice Custom AI

Turn your writing style into a Custom AI. Eden studies your samples, writes a voice profile document you can read and edit, and drafts in your cadence from then on.

Create your first Custom AI

Three ways to build one — a guided chat that interviews you, a voice builder that studies your writing, or a blank form where you set everything yourself.

Still stuck?

Email us. A real person reads every message.

Tell us what you tried and where you got stuck. We answer within one business day.

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