legendary-sales-letter: long-form sales copy

Copywriting Cowork-ready

What it does

legendary-sales-letter is your long-form copywriter. Give it a brand URL and a product, and it produces a sales letter or advertorial the way the masters built them: Schwartz’s awareness levels, Halbert’s slippery slide, Sugarman’s triggers, Bencivenga’s proof architecture, Carlton’s bullets, synthesized into one coherent piece.

It’s not a template filler. It runs deep research first (triggering apollo for customer intelligence, voice-of-customer language, competitor gaps, and belief architecture), then writes copy that sounds like your buyer’s internal monologue. The output is a finished copy document on real customer language: headline options, lead, body, bullets, proof sections, and close.

When to reach for it

You’re writing a sales page, long-form landing page, or direct mail piece at a professional level.
You need an advertorial that warms cold traffic before the offer.
You want to know what lead type fits your market (Problem-Agitate-Solve, Big Secret, Prediction, Proclamation, and more) before writing.
You have a product with a complex story a short ad can’t tell.
You want to audit or improve existing copy against the masters’ frameworks.

Where it runs

Cowork ✓ Desktop ✓

legendary-sales-letter works in both environments. It’s a pure writing skill (no image generation, no deploys), so nothing is desktop-only, but because it triggers apollo, a live web connection is required for research. It writes the letter: turning it into a deployable page is a separate job for page-architect (desktop only).

How to run it

Point it at a URL and tell it what you’re writing:

“Write a sales letter for examplebrand.com, targeting busy professionals who’ve tried every sleep supplement and given up.”

Or name the format:

“/um-toolkit:legendary-sales-letter write an advertorial for examplebrand.com, problem-aware, 3,000 words max.”

Or steer the format:

Advertorial: 1,500 to 4,000 words, editorial style, reads like an article.
Sales letter: 3,000 to 8,000 words, classic direct response, front-loaded with the big idea.
Direct mail: 2,000 to 6,000 words, controlled messaging for physical or email.

What it needs from you

A brand URL. The anchor for all research; the more real the URL, the sharper the output.
(Optional) The audience’s awareness level (unaware, problem-aware, solution-aware). If unsure, give your best guess and it calibrates.
(Optional) The format (advertorial, sales letter, or direct mail).
(Optional) A word count target (“keep it under 4,000 words”).

It works best after you’ve onboarded your brand, but it can research cold from any URL.

What you get back

A complete copy document in five layers:

Research summary: the key customer insight, the dominant purchase emotion, the sophistication level, and the belief chain to walk through.
Strategic foundation: the big idea (one sentence), the unique mechanism, and the lead type chosen.
Headline options: three to five candidates ranked by fit to the awareness level.
Full copy draft: lead, body, proof sections, bullets, and close, written in full.
Notes on the close: offer elements present or missing, plus any compliance flags to review.

A worked example

An illustrative opening for a fictional sleep supplement, problem-aware level, “Big Secret” lead:

Headline: The reason you wake up at 3am has nothing to do with stress (and everything to do with one missing mineral)

Lead: If you’ve tried melatonin, magnesium, and every “sleep stack” the biohackers recommend and you’re still lying awake doing math on the hours left before your alarm, this is the most important thing you’ll read today. Not because I’m selling you something different, but because I’ll tell you why none of it worked.

That’s the slippery slide: the mechanism creates curiosity without revealing the answer, and the self-qualifier makes the copy feel written for the reader. In a real run, the skill writes the full body through the close.

Tips & gotchas

Don’t cut the research phase short. The customer language apollo surfaces is what makes copy sound real. The best lines come from a customer review, not a clever writer.
Awareness level matters more than almost anything. An unaware prospect needs the problem surfaced first; a solution-aware one needs to know why yours is different. Tell it where your traffic comes from and it calibrates.
It won’t invent proof. With no testimonials, case studies, or clinical data, the skill flags the gap before the close, far safer surfaced now than after copy goes live.
The output is a copy document, not a web page. Hand the draft to page-architect for a styled, deployed page.
Long-form is supposed to be long. For warm or solution-aware buyers on a considered purchase, long copy beats short because it handles every objection before they leave. Don’t ask it to “keep it short” without a reason.

It runs apollo automatically; to review the research before writing starts, run apollo manually and pass the brief. For the finished page, pair with page-architect (turns the copy document into a deployed web page). For the ads that drive traffic there, use meta-image-ad-generator or seedance-video-ad-generator after the letter is written, since the letter surfaces the best angles and hooks.