Is the Book Companion Skill skill free?

Yes. The skill itself is free from twhsi/skills. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Book Companion Skill SkillProof Score?

8.0/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 6/10, docs & honesty 4/5.

How do I install Book Companion Skill?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Book Companion Skill with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Book Companion Skill

Turn book chapters and exercises into shareable, reusable AI companion artifacts

by twhsi · twhsi/skills

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.0/10
Tested: Aug 5, 2026
Environment: Claude Code 2.x (agent harness)

⚠ This skill is no longer available upstream. Our re-check on Aug 10, 2026 couldn't find it any more (repo unreachable/deleted). The test below is what we measured on Aug 5, 2026 and we're leaving it up as a record — but there is nothing left to install, so we've removed the command.

Ran a chapter-exercise-to-companion-card task both ways: the skill's fixed templates forced an explicit artifact-type choice, a baked-in 'ask at most two clarifying questions' constraint, and durable GitHub links over local paths — a modest but real consistency edge a cold baseline drifts on. It is a lean 103-line prompt-only skill with no scripts, and it self-identifies as a Codex tool though it runs fine in Claude, and it lives in the repo's archive/ folder.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 6/10
Docs & honesty 4/5

What Book Companion Skill does

Converts book material — chapter excerpts, reader exercises, prompts, worksheets, author notes — into reader-friendly artifacts: paste-ready prompts, SKILL.md drafts, or GitHub companion cards. Loads when an author wants to package chapter content into something readers can run. Provides fixed output templates plus a stable-slug and durable-link discipline.

How to install Book Companion Skill

Nothing to install: the source repository no longer has this skill. If the author brings it back, our daily re-check will pick it up and the command will reappear here.

Commands — how to trigger Book Companion Skill

/book-companion-skill Turn book chapters and exercises into shareable, reusable AI companion artifacts

It also activates on plain-language prompts like these:

Turn this chapter exercise into a reusable shareable AI prompt
Make a companion card for my book's README on GitHub
Convert this worksheet into a paste-ready reader prompt artifact

Frequently asked questions

Is the Book Companion Skill skill free?: Yes. The skill itself is free from twhsi/skills. SkillProof publishes the install command and an independent test verdict at no cost.
Does Book Companion Skill work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Aug 5, 2026. Verdict: Tested · Works. Ran a chapter-exercise-to-companion-card task both ways: the skill's fixed templates forced an explicit artifact-type choice, a baked-in 'ask at most two clarifying questions' constraint, and durable GitHub links over local paths — a modest but real consistency edge a cold baseline drifts on. It is a lean 103-line prompt-only skill with no scripts, and it self-identifies as a Codex tool though it runs fine in Claude, and it lives in the repo's archive/ folder.
What is the Book Companion Skill SkillProof Score?: 8.0/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 6/10, docs & honesty 4/5.
How do I install Book Companion Skill?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Book Companion Skill with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.