Markitdown
ImCa0/just-laws
Convert files and office documents to Markdown. An agent skill from ImCa0/just-laws.
Take any book (EPUB/PDF), produce a personalized chapter-by-chapter analysis with two-column tables.
Install Book Mirror
$ npx skills add inbrainfun/inbrain --skill book-mirror -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install inbrainfun/inbrain book-mirror --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/book-mirror .claude/skills/book-mirror && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "book-mirror" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirror into .claude/skills/book-mirror/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "book-mirror", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirrorType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add inbrainfun/inbrain --skill book-mirror -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install inbrainfun/inbrain book-mirror --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/book-mirror .agents/skills/book-mirror && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "book-mirror" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirror into .agents/skills/book-mirror/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "book-mirror", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add inbrainfun/inbrain --skill book-mirror -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install inbrainfun/inbrain book-mirror --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/book-mirror .cursor/skills/book-mirror && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "book-mirror" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirror into .cursor/skills/book-mirror/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "book-mirror", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/inbrainfun/inbrain.git --path skills/book-mirror--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add inbrainfun/inbrain --skill book-mirror -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install inbrainfun/inbrain book-mirror --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/book-mirror .gemini/skills/book-mirror && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "book-mirror" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirror into .gemini/skills/book-mirror/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "book-mirror", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install inbrainfun/inbrain book-mirrorInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add inbrainfun/inbrain --skill book-mirror -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/book-mirror .github/skills/book-mirror && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "book-mirror" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirror into .github/skills/book-mirror/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "book-mirror", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add inbrainfun/inbrain --skill book-mirror -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install inbrainfun/inbrain book-mirror --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/inbrainfun/inbrain.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/book-mirror .opencode/skills/book-mirror && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "book-mirror" agent skill from https://github.com/inbrainfun/inbrain/tree/main/skills/book-mirror into .opencode/skills/book-mirror/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "book-mirror", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
book-mirror- GitHub stars
- 142
- Token cost
- ~3.3k tokens
- SKILL.md length
- 1,338 words
- Files
- 2
- Skills in repo
- 52
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Take any book (EPUB/PDF), produce a personalized chapter-by-chapter analysis with two-column tables.
- Works in 6 steps: Acquiring the book → Text extraction → Context gathering → …
- Tasks that involve PDF
- SKILL.md covers What this does, Trust contract (read this…, The pipeline and 1. Acquiring the book, plus 12 more sections
- Calls python3, pdftotext and pip3
What it does
Book Mirror is an agent skill from inbrainfun/inbrain. Take any book (EPUB/PDF), produce a personalized chapter-by-chapter analysis with two-column tables. Left column preserves the chapter content; right column maps every idea to the reader's actual life using brain context. Output is a single brain page at media/books/<slug-personalized.md plus an optional PDF via brain-pdf.
Its SKILL.md is about 3.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file.
It sits in Documents & Office, covering PDF.
When your agent uses it
- Tasks that involve PDF
Example prompts
- “/book-mirror”
Requirements
- Python 3
Workflow steps
6 steps, taken from the step headings in SKILL.md.
- Acquiring the book
- Text extraction
- Context gathering
- Analysis: invoke inbrain book-mirror
- PDF (optional)
- Fact-check and cross-link
What it can do on your machine
Read from SKILL.md and the folder at commit 5231990. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
python3pdftotextpip3
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use pip3, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Book Mirror loads about 3.3k tokens when it runs. Until then it costs about 84 tokens; SKILL.md has 1,338 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 1,338 words (~3,296 tokens).
“Given a book (EPUB or PDF), produce a brain page where every chapter is summarized in detail on the left and mirrored back to the reader's actual life on the right, using their own words, situations, people, and patterns from…”
- name
- book-mirror
- version
- 0.1.0
- triggers
- personalized version of this book, mirror this book, two-column book analysis, apply this book to my life, how does this book apply to me
- mutating
- true
- writes_pages
- true
- writes_to
- media/books/
Files
SKILL.md and 1 other file in skills/book-mirror of inbrainfun/inbrain.
- SKILL.md
- routing-eval.jsonl
Open the folder on GitHubat commit 5231990
Compare with similar skills
Book Mirror next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Book Mirror this skillinbrainfun/inbrain | 142 | — | ~3.3k | Automated safety check: Pass | Custom licence | |
| MarkitdownImCa0/just-laws | 781 | 14 repos | ~3.2k | Automated safety check: Notes | MIT | |
| Gzh Designisjiamu/gzh-design-skill | 3.9k | 1 repos | ~2.2k | Automated safety check: Pass | AGPL-3.0 | |
| GenOffice Document CLIgenspark-ai/genoffice | 8.9k | — | ~19k | Automated safety check: Pass | Apache-2.0 | |
| Harness Book Best Practicewquguru/harness-books | 3.2k | — | ~4.1k | Automated safety check: Pass | None | |
| Bookforge Korean Ebook PDF Makergongnyang/bookforge | 314 | 1 repos | ~1.7k | Automated safety check: Pass | MIT |
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Categories
Questions about Book Mirror
What does Book Mirror do?
Take any book (EPUB/PDF), produce a personalized chapter-by-chapter analysis with two-column tables. Book Mirror is an agent skill from inbrainfun/inbrain. Take any book (EPUB/PDF), produce a personalized chapter-by-chapter analysis with two-column tables.
When should I use Book Mirror?
Book Mirror fits situations like: tasks that involve PDF.
How do I install Book Mirror in Claude Code?
Run `npx skills add inbrainfun/inbrain --skill book-mirror -a claude-code`. Or copy the skill folder (skills/book-mirror in inbrainfun/inbrain) into .claude/skills/book-mirror in your project. Claude Code loads it when a task matches its description.
How do I install Book Mirror in Codex?
Run `npx skills add inbrainfun/inbrain --skill book-mirror -a codex`. Or copy the skill folder (skills/book-mirror in inbrainfun/inbrain) into .agents/skills/book-mirror in your project. Codex loads it when a task matches its description.
Can I use Book Mirror in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add inbrainfun/inbrain --skill book-mirror -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/book-mirror, .gemini/skills/book-mirror, .github/skills/book-mirror and .opencode/skills/book-mirror in your project.
What does Book Mirror need to run?
Going by SKILL.md and its folder, Book Mirror needs the command-line tools its instructions call (python3, pdftotext and pip3). Our summary lists: Python 3.
Does Book Mirror access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Book Mirror safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Book Mirror use?
Book Mirror has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Book Mirror use?
About 3.3k tokens (SKILL.md is roughly 13k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Book Mirror?
Skills that share tags, products or a category with Book Mirror: Markitdown (ImCa0/just-laws, 781 stars), Gzh Design (isjiamu/gzh-design-skill, 3.9k stars), GenOffice Document CLI (genspark-ai/genoffice, 8.9k stars) and Harness Book Best Practice (wquguru/harness-books, 3.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Book Mirror?
inbrainfun (a GitHub user) maintains it in inbrainfun/inbrain, which has 142 GitHub stars. The repository holds 52 skills in this directory. The repository was last updated on July 17, 2026.
Source: inbrainfun/inbrain on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.