Book to Skill Converter
virgiliojr94/book-to-skill
Converts books and documents in PDF, EPUB, DOCX, HTML, Markdown, text, RTF or MOBI form into agent skills built from frameworks, principles, techniques and anti-patterns.
Create and contribute skills to the communal knowledge base.
Install Skill Development
$ npx skills add letta-ai/skills --skill skill-development -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install letta-ai/skills skill-development --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/letta-ai/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/meta/skill-development .claude/skills/skill-development && 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 "skill-development" agent skill from https://github.com/letta-ai/skills/tree/main/meta/skill-development into .claude/skills/skill-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-development", 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/letta-ai/skills/tree/main/meta/skill-developmentType 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 letta-ai/skills --skill skill-development -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install letta-ai/skills skill-development --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/letta-ai/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/meta/skill-development .agents/skills/skill-development && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "skill-development" agent skill from https://github.com/letta-ai/skills/tree/main/meta/skill-development into .agents/skills/skill-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-development", 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 letta-ai/skills --skill skill-development -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install letta-ai/skills skill-development --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/letta-ai/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/meta/skill-development .cursor/skills/skill-development && 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 "skill-development" agent skill from https://github.com/letta-ai/skills/tree/main/meta/skill-development into .cursor/skills/skill-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-development", 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/letta-ai/skills.git --path meta/skill-development--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 letta-ai/skills --skill skill-development -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install letta-ai/skills skill-development --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/letta-ai/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/meta/skill-development .gemini/skills/skill-development && 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 "skill-development" agent skill from https://github.com/letta-ai/skills/tree/main/meta/skill-development into .gemini/skills/skill-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-development", 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 letta-ai/skills skill-developmentInstalls 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 letta-ai/skills --skill skill-development -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/letta-ai/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/meta/skill-development .github/skills/skill-development && 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 "skill-development" agent skill from https://github.com/letta-ai/skills/tree/main/meta/skill-development into .github/skills/skill-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-development", 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 letta-ai/skills --skill skill-development -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install letta-ai/skills skill-development --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/letta-ai/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/meta/skill-development .opencode/skills/skill-development && 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 "skill-development" agent skill from https://github.com/letta-ai/skills/tree/main/meta/skill-development into .opencode/skills/skill-development/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "skill-development", 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
skill-development- GitHub stars
- 147
- Token cost
- ~941 tokens
- SKILL.md length
- 345 words
- Files
- 10 (incl. scripts, references)
- Skills in repo
- 22
- Repo updated
- First seen
- Licence
- MIT
At a glance
Create and contribute skills to the communal knowledge base.
- Works in 3 steps: Metadata (~100 words) - Always in context → SKILL.md body (<5k words) - When skill… → References (unlimited) - Loaded as…
- Creating new skills
- SKILL.md covers When to Use This Skill, Part 1: Creating Skills, Part 2: Contributing Skills and Scripts, plus 1 more section
- Runs Python scripts from its folder
What it does
Skill Development is an agent skill from letta-ai/skills. Create and contribute skills to the communal knowledge base. Use when creating new skills, updating existing skills, or contributing learnings back to the repository.
Its SKILL.md is about 940 tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including scripts and reference files (for example `references/contribution-examples.md`, `references/pr-workflow.md` and `references/progressive-disclosure-research.md`).
It sits in Knowledge Management, covering Skill authoring and Knowledge bases. The repository describes itself as: A shared repository for skills. Intended to be used with Letta Code, Claude Code, Codex CLI, and other agents that support skills. The licence is MIT.
When your agent uses it
- Creating new skills
- Updating existing skills
- Contributing learnings back to the repository
Example prompts
- “/skill-development”
Requirements
- Python 3
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Metadata (~100 words) - Always in context
- SKILL.md body (<5k words) - When skill triggers
- References (unlimited) - Loaded as needed by agent
What it can do on your machine
Read from SKILL.md and the folder at commit 6785511. 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
Ships 3 files in scripts/ (Python), which the agent can run.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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
Skill Development loads about 941 tokens when it runs, and up to ~17k if it reads all its reference files. Until then it costs about 46 tokens; SKILL.md has 345 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); the scripts in this folder are not scanned.
SKILL.md
The full file from letta-ai/skills at commit 6785511, republished under its MIT licence (© letta-ai). 345 words, ~941 tokens.
Download SKILL.mdSave it as
.claude/skills/skill-development/SKILL.md (or your agent's skills folder). This skill also uses 9 other files; get the full folder from GitHub.- name
- skill-development
- description
- Create and contribute skills to the communal knowledge base. Use when creating new skills, updating existing skills, or contributing learnings back to the repository.
- license
- MIT
Skill Development
Guide for creating effective skills and contributing them to the communal knowledge base.
When to Use This Skill
Creating skills:
- Building a new skill for a specific domain or workflow
- Updating an existing skill with improvements
- Packaging skills for distribution
Contributing skills:
- You discovered something that took significant time to figure out
- Existing skill instructions were incomplete or led you astray
- You repeatedly solve the same undocumented problem
Part 1: Creating Skills
Skill Structure
skill-name/
├── SKILL.md (required)
│ ├── YAML frontmatter (name, description)
│ └── Markdown instructions
└── Bundled Resources (optional)
├── scripts/ - Executable code
├── references/ - Documentation loaded as needed
└── assets/ - Files used in outputSKILL.md Requirements
---
name: skill-name
description: What this skill does. Use when [triggers].
---
# Skill Name
[Instructions in imperative form...]Metadata rules:
name: lowercase, hyphens, gerund form (e.g.,creating-skills)description: Lead with action verbs, end with "Use when [triggers]"
Writing Style
Write in imperative/infinitive form (verb-first), not second person:
- ✅ "To accomplish X, do Y"
- ❌ "You should do X"
Progressive Disclosure
Keep SKILL.md lean (<5k words). Move detailed content to references/:
- Metadata (~100 words) - Always in context
- SKILL.md body (<5k words) - When skill triggers
- References (unlimited) - Loaded as needed by agent
Scripts
Include scripts for tasks that:
- Are repeatedly rewritten
- Require deterministic reliability
- Save significant tokens
Part 2: Contributing Skills
Core Philosophy
This repository is a living knowledge base. Skills must contain general-purpose knowledge that helps many agents - not project-specific configs or personal preferences.
What to Contribute
| ✅ Contribute | ❌ Don't Contribute |
|---|---|
| Patterns that appear 3+ times | One-off solutions |
| General API/tool patterns | Project-specific configs |
| Battle-tested workarounds | Personal preferences |
| Gap in existing skills | Already documented elsewhere |
Validation Checklist
Before contributing, verify:
- Is this generalizable beyond your specific context?
- Have you seen this pattern multiple times?
- Does this address a real gap vs. personal preference?
- Would this help an agent on a completely different project?
Contribution Process
- Recognize - Notice patterns during work (time investment, repetition, corrections)
- Validate - Confirm pattern is general, not specific to your context
- Create branch -
add/skill-nameorfix/skill-name - Submit PR - Clear description with rationale and evidence
See references/pr-workflow.md for detailed PR process.
Scripts
scripts/init_skill.py- Initialize skill directory structurescripts/package_skill.py- Package skill for distributionscripts/quick_validate.py- Validate SKILL.md format
References
references/recognizing-learnings.md- Patterns for spotting valuable learningsreferences/validation-criteria.md- Detailed validation guidelinesreferences/pr-workflow.md- PR process and templatesreferences/contribution-examples.md- Real contribution examplesreferences/progressive-disclosure-research.md- Research on skill organization
© letta-ai, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 9 other files (scripts, references) in meta/skill-development of letta-ai/skills.
- SKILL.md
- LICENSE
- references/contribution-examples.md
- references/pr-workflow.md
- references/progressive-disclosure-research.md
- references/recognizing-learnings.md
- references/validation-criteria.md
- scripts/init_skill.py
- scripts/package_skill.py
- scripts/quick_validate.py
Open the folder on GitHubat commit 6785511
Compare with similar skills
Skill Development 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 |
|---|---|---|---|---|---|---|
| Skill Development this skillletta-ai/skills | 147 | — | ~941 | Automated safety check: Pass | MIT | |
| Book to Skill Convertervirgiliojr94/book-to-skill | 34k | — | ~14k | Automated safety check: Pass | MIT | |
| Open Knowledge Write Skillinkeep/open-knowledge | 4.4k | — | ~3.7k | Automated safety check: Pass | GPL-3.0 | |
| Otodock PlatformOtoDock/oto-dock | 190 | — | ~2.3k | Automated safety check: Pass | Custom licence | |
| Work Operating ModelNateBJones-Projects/OB1 | 4.7k | — | ~2.2k | Automated safety check: Pass | Custom licence | |
| Memory ImportPrismer-AI/PrismerCloud | 1.6k | — | ~665 | Automated safety check: Pass | MIT |
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Related
Categories
Questions about Skill Development
What does Skill Development do?
Create and contribute skills to the communal knowledge base. Skill Development is an agent skill from letta-ai/skills. Create and contribute skills to the communal knowledge base.
When should I use Skill Development?
Skill Development fits situations like: creating new skills; updating existing skills; contributing learnings back to the repository.
How do I install Skill Development in Claude Code?
Run `npx skills add letta-ai/skills --skill skill-development -a claude-code`. Or copy the skill folder (meta/skill-development in letta-ai/skills) into .claude/skills/skill-development in your project. Claude Code loads it when a task matches its description.
How do I install Skill Development in Codex?
Run `npx skills add letta-ai/skills --skill skill-development -a codex`. Or copy the skill folder (meta/skill-development in letta-ai/skills) into .agents/skills/skill-development in your project. Codex loads it when a task matches its description.
Can I use Skill Development 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 letta-ai/skills --skill skill-development -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/skill-development, .gemini/skills/skill-development, .github/skills/skill-development and .opencode/skills/skill-development in your project.
What does Skill Development need to run?
Going by SKILL.md and its folder, Skill Development needs Python for the scripts in its folder. Our summary lists: Python 3.
Does Skill Development 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 Skill Development 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. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Skill Development use?
Skill Development is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Skill Development use?
About 941 tokens (SKILL.md is roughly 3.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 16k tokens, read only when the agent opens those files.
What are the alternatives to Skill Development?
Skills that share tags, products or a category with Skill Development: Book to Skill Converter (virgiliojr94/book-to-skill, 34k stars), Open Knowledge Write Skill (inkeep/open-knowledge, 4.4k stars), Otodock Platform (OtoDock/oto-dock, 190 stars) and Work Operating Model (NateBJones-Projects/OB1, 4.7k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Skill Development?
letta-ai (a GitHub organization) maintains it in letta-ai/skills, which has 147 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 1, 2026.
Source: letta-ai/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.