Design and pressure-test useful nonfiction book promises, scopes, recommendation loops, and takeaway-first tables of contents before drafting.
SkillScore91Maintained
Automatic
◆Writing & Editing pack
Last verified 8/15/2026
What it changes
Passed 20 of 22 test cases with the skill, and 3 of 22 without it.
Without skill14%
With skill91%
Checks it passed that the model alone missed
Details a recommendation story section.
Includes a recommendation story section.
Includes vague chapters in the risk list.
and 22 more in the full report
17 fixed3 passed either way2 still failing0 broke
Pass-rate lift
+77 pp
Tokens
+44%
Agent turns
0%
Response time
+30%
Model gemini-3.6-flashMeasured 8/15/2026v120 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 17 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 17
Prompt
Design a book TOC for Python developers learning microservices architecture. I just want a list of chapter names with cool tech keywords.
What was checked, without and with the skill
Checked
Without skill
With skill
Includes explicit reader problems for each TOC chapter.
Missed
Passed
Includes explicit risk evaluations for vague chapters.
Missed
Passed
case-12 · gemini-3.6-flash · 8/15/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md62 lines2 files
Book TOC Lab
Treat a useful nonfiction book as a problem-solving product for a specific
reader. The table of contents is the product design, not a decorative outline.
Build and test the promise, scope, recommendation loop, and TOC before drafting
so the manuscript has a clear job and useful progression.
Use this skill to produce or improve a book plan that answers:
Who is this book for?
What painful or valuable problem does it help them solve?
What should be different for the reader after each chapter?
What does the book deliberately leave out?
Why would a satisfied reader recommend it to a specific person in a specific
situation?