Skill Development logo

Skill Development

Organization
letta-ai
skill-development

Create and contribute skills to the communal knowledge base. Use when creating new skills, updating existing skills, or contributing learnings back to the repository.

Overview

Publisherletta-ai
Repositoryskills
Skill nameskill-development
Stars
144
Forks
25
Bundled files
8
LicenseMIT
Links
  • Markdown instructions

    A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.

  • Works with any LLM

    AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.

  • 8 bundled files

    Scripts, templates, and references the model can read while it works. Files are read-only and never executed.

  • Open source

    Published by letta-ai on GitHub. Read the source before you install it.

Installation

Install the Skill Development AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

1

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

  1. Open the app and go to Plugins → Skills.
  2. Choose "Install from GitHub".
  3. Paste the skill folder URL below and confirm.
  4. Enable the skill in any chat where you want it available.
Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.
2

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills
git clone --depth 1 https://github.com/letta-ai/skills.git /tmp/skills
mkdir -p .claude/skills
cp -r /tmp/skills/meta/skill-development .claude/skills/skill-development
Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Skill Development in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Skill Development on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Skill Development is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

  • Loaded only when it is needed

    The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.

  • Switch models mid-chat

    Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

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 output

SKILL.md Requirements

yaml
---
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/:

  1. Metadata (~100 words) - Always in context
  2. SKILL.md body (<5k words) - When skill triggers
  3. 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+ timesOne-off solutions
General API/tool patternsProject-specific configs
Battle-tested workaroundsPersonal preferences
Gap in existing skillsAlready 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

  1. Recognize - Notice patterns during work (time investment, repetition, corrections)
  2. Validate - Confirm pattern is general, not specific to your context
  3. Create branch - add/skill-name or fix/skill-name
  4. 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 structure
  • scripts/package_skill.py - Package skill for distribution
  • scripts/quick_validate.py - Validate SKILL.md format

References

  • references/recognizing-learnings.md - Patterns for spotting valuable learnings
  • references/validation-criteria.md - Detailed validation guidelines
  • references/pr-workflow.md - PR process and templates
  • references/contribution-examples.md - Real contribution examples
  • references/progressive-disclosure-research.md - Research on skill organization

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Skill Development AI skill do?

Create and contribute skills to the communal knowledge base. Use when creating new skills, updating existing skills, or contributing learnings back to the repository.

Why use Skill Development on TypingMind?

Because you install it once and use it with any model. Skill Development is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Skill Development in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/letta-ai/skills/tree/main/meta/skill-development. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Skill Development?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Skill Development?

As many as you like. As long as a model supports skills, you can use Skill Development with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Skill Development AI skill free?

Yes. It is published on GitHub by letta-ai under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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