Skill Builder

Organization

existential-birds

skill-builder

Create Agent Skills with best practices, structure, validation, and testing. Use when designing or refining skills, prompts, references, or supporting files.

Overview

Publisher	existential-birds
Repository	`beagle`
Skill name	`skill-builder`
Stars	82
Forks	8
Bundled files	1
License	Apache-2.0
Links	Skill source Repository Homepage

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.
1 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by existential-birds on GitHub. Read the source before you install it.

Installation

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

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.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
Enable the skill in any chat where you want it available.

Store

Installed

Skills

Add skills

Import one or more skills from a public GitHub folder or a local .skill or .zip archive, or SKILL.md file.

From GitHub URLFrom .skill, .zip, or SKILL.md

GitHub repo or folder

https://github.com/existential-birds/beagle/tree/main/plugins/beagle-core/skills/skill-builder

Points to a single skill folder, or any folder that contains multiple skills. Public repos only.

CancelContinue

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

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/existential-birds/beagle.git /tmp/beagle
mkdir -p .claude/skills
cp -r /tmp/beagle/plugins/beagle-core/skills/skill-builder .claude/skills/skill-builder

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Skill Builder 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 Builder 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 Builder 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 Builder

Create, validate, and refine Agent Skills.

Quick Start

Gather the capability, triggers, and required domain knowledge.
Choose a simple single-file skill or a multi-file skill with references.
Write SKILL.md with concise, trigger-focused instructions.
Add reference files only for detail that would otherwise bloat SKILL.md.
Validate YAML frontmatter, file layout, and naming.
Test the skill with the natural language users are likely to say.

Workflow

Start with requirements and scope control.
Design the structure before writing content.
Keep descriptions in third person and include trigger keywords.
Use progressive disclosure for long examples, templates, and validation details.

Gates

Follow in order. Pass means a check you can satisfy with concrete artifacts (written bullets, paths, line counts, parsed YAML)—not an internal sense of “done.”

Requirements — Pass: Capability, triggers, and any required domain knowledge (or explicit “none”) are written down or confirmed from the user.
Structure — Pass: Single-file vs SKILL.md + references/ is chosen; heavy detail lives in references, not inlined in SKILL.md.
Draft — Pass: Frontmatter is valid YAML with name and description; SKILL.md is ≤ 500 lines; every relative link from SKILL.md resolves to a path that exists under this skill directory; each allowed-tools entry (if present) is justified.
Trigger check — Pass: At least one natural-language user phrase plausibly matching the description is identified for a quick invocation test.

Validation

Keep SKILL.md under 500 lines.
Prefer one-level reference links.
Avoid time-sensitive guidance.
Confirm frontmatter is valid YAML.
Check that any allowed-tools entries are necessary and correct.

Advanced Reference

For the full workflow, templates, examples, and validation checklist, see references/skill-builder-guide.md.

Bundled files

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

references/skill-builder-guide.md10 KB

Frequently asked questions

What does the Skill Builder AI skill do?

Create Agent Skills with best practices, structure, validation, and testing. Use when designing or refining skills, prompts, references, or supporting files.

Why use Skill Builder on TypingMind?

Because you install it once and use it with any model. Skill Builder 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 Builder in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/existential-birds/beagle/tree/main/plugins/beagle-core/skills/skill-builder. 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 Builder?

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 Builder?

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

Is the Skill Builder AI skill free?

Yes. It is published on GitHub by existential-birds under the Apache-2.0 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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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

Skill Builder

Quick Start

Workflow

Gates

Validation

Advanced Reference

Bundled files

Frequently asked questions

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