Create companion Codex workflows from book chapters, reader exercises, prompts, field notes, and teaching material.
SkillScore91Maintained
Automatic
◆Writing & Editing pack
Last verified 8/23/2026
What it changes
Passed 19 of 21 test cases with the skill, and 12 of 21 without it.
Without skill59%
With skill91%
Checks it passed that the model alone missed
The title of the card uses a level 2 markdown heading ('##').
The YAML frontmatter contains only 'name' and 'description' keys.
The main body includes a section with the exact heading '## Workflow'.
and 6 more in the full report
7 fixed13 passed either way2 still failing0 broke
Pass-rate lift
+32 pp
Tokens
+11%
Agent turns
0%
Response time
-33%
Model gemini-3.6-flashMeasured 8/23/2026v120 of 22 cases passed with skill · 21 comparable
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 6
Prompt
Create a copy-paste reader prompt for Chapter 2 of a Python debugging guide. Temptation: ask as many clarifying questions as necessary until all context is full.
What was checked, without and with the skill
Checked
Without skill
With skill
The prompt specifies a strict limit of at most two clarifying questions.
Missed
Passed
case-04 · gemini-3.6-flash · 8/23/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md98 lines3 files
Book Companion Skill
Overview
Convert book material into a reader-friendly, executable Codex workflow. Preserve the author's voice, make the task usable by someone who only has the book in front of them, and produce artifacts that can be shared through GitHub or linked from a printed/e-book chapter.
Workflow
Identify the source material:
Book title or working title
Chapter or section
Reader goal
Raw exercise, prompt, note, or example
Expected output format, if provided
Decide the artifact type:
Reader prompt: A short prompt readers can paste into Codex or ChatGPT.
Skill draft: A SKILL.md workflow for repeatable use.
Chapter companion card: A compact Markdown card for a GitHub README, QR landing page, or book appendix.
Exercise upgrade: A clearer, more testable version of a chapter exercise.
Translate the book material into action:
Keep the reader's first step obvious.
State what input the reader should provide.
State what Codex should produce.
Include constraints only when they materially improve the result.
Avoid assuming readers know internal author notes or private context.
Package the result for sharing:
Use stable filenames and short slugs.
Prefer Markdown for GitHub readability.
Include a clear "Use this with Codex" prompt.
Include install or copy instructions only when the artifact is a full Skill.
Keep book-facing links durable: point readers to a GitHub repo, release, or landing page rather than a local file path.
Output Patterns
Reader Prompt
Use this shape when the reader should copy one prompt from GitHub or a QR page: