Builtin Skills

OrganizationPopular

charmbracelet

builtin-skills

Use when creating a new builtin skill for Crush, editing an existing builtin skill (internal/skills/builtin/), or when the user needs to understand how the embedded skill system works.

Overview

Publisher	charmbracelet
Repository	`crush`
Skill name	`builtin-skills`
Stars	28.6K
Forks	2.3K
Bundled files	Instructions only
Links	Skill source Repository

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.
Self-contained
Everything the model needs lives in the instructions — no extra files to sync.
Open source
Published by charmbracelet on GitHub. Read the source before you install it.

Installation

Install the Builtin Skills 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.
https://github.com/charmbracelet/crush/tree/main/.agents/skills/builtin-skills
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.

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/charmbracelet/crush.git /tmp/crush
mkdir -p .claude/skills
cp -r /tmp/crush/.agents/skills/builtin-skills .claude/skills/builtin-skills

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

Use it in TypingMind

Enable Builtin Skills 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 Builtin Skills 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 Builtin Skills 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.

Builtin Skills

Crush embeds skills directly into the binary via internal/skills/builtin/. These are always available without user configuration.

How It Works

Each skill lives in internal/skills/builtin/<skill-name>/SKILL.md.
The tree is embedded at compile time via //go:embed builtin/* in internal/skills/embed.go.
DiscoverBuiltin() walks the embedded FS, parses each SKILL.md, and sets paths with the crush://skills/ prefix (e.g., crush://skills/jq/SKILL.md).
The View tool resolves crush:// paths from the embedded FS, not disk.
User skills with the same name override builtins (last occurrence wins in Deduplicate()).

Adding a New Builtin Skill

Create internal/skills/builtin/<skill-name>/SKILL.md with YAML frontmatter (name, description) and markdown instructions. The directory name must match the name field.
No extra wiring needed — //go:embed builtin/* picks up new directories automatically.
Add a test assertion in TestDiscoverBuiltin in internal/skills/skills_test.go to verify discovery.
Build and test: go build . && go test ./internal/skills/...

Existing Builtin Skills

Skill	Directory	Description
`crush-config`	`builtin/crush-config/`	Crush configuration help
`crush-hooks`	`builtin/crush-hooks/`	Authoring, configuring and debugging hooks
`jq`	`builtin/jq/`	jq JSON processor usage guide

Frequently asked questions

What does the Builtin Skills AI skill do?

Use when creating a new builtin skill for Crush, editing an existing builtin skill (internal/skills/builtin/), or when the user needs to understand how the embedded skill system works.

Why use Builtin Skills on TypingMind?

Because you install it once and use it with any model. Builtin Skills 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 Builtin Skills in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/charmbracelet/crush/tree/main/.agents/skills/builtin-skills. TypingMind reads its SKILL.md and installs it as a skill you can enable per chat.

Which AI models can use Builtin Skills?

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 Builtin Skills?

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

Is the Builtin Skills AI skill free?

It is published on GitHub by charmbracelet. Check the repository for licensing terms. 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

Builtin Skills

How It Works

Adding a New Builtin Skill

Existing Builtin Skills

Frequently asked questions

Related AI Skills

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