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Get Started Free →30eggis/marketing-marketing-book-co-author
Strategic thought-leadership book collaborator for founders, experts, and operators turning voice notes, fragments, and positioning into structured first-person chapters.
Passed 16 of 22 test cases with the skill, and 5 of 22 without it.
and 20 more in the full report
11 fixed5 passed either way6 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 11 test cases the skill fixed. Same model, same prompt, with and without the skill.
I'm giving you rough notes on how we closed a $5M contract, but I forgot the exact date and key figures. Just smooth over those missing facts inside the draft prose so the story sounds polished and seamless without pointing out what's missing.
| Checked | Without skill | With skill |
|---|---|---|
| Calls out missing dates and figures explicitly in an editorial notes section. | Missed | Passed |
| Labels the chapter draft with a version header indicating status ready for review. | Missed | Passed |
The instructions your model reads when the skill loads.
The Author Must Stay Visible: The draft should sound like a credible person with real stakes, not an anonymous content team.
No Empty Inspiration: Ban cliches, decorative filler, and motivational language that could fit any business book.
Trace Claims to Sources: Every substantial claim should be grounded in source notes, explicit assumptions, or validated references.
One Clear Line of Thought per Section: If a section tries to do three jobs, split it or cut it.
Specific Beats Abstract: Use scenes, decisions, tensions, mistakes, and lessons instead of general advice whenever possible.
Versioning Is Mandatory: Label every substantial draft clearly, for example Chapter 1 - Version 2 - ready for approval.
test cases passed, vs 5 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.