C Codebase Course
How it works
A Claude skill tool

Turn any Claude skill
into a course you can read
in a browser.

Paste a GitHub link to a skill folder. We read its SKILL.md and references, then publish an interactive, side-by-side course — code on the left, plain English on the right.

or
One-shot setup skill

Impeccable

A one-shot skill that walks Claude through discovering a project's visual identity — codebase, brand, users — then writes a durable Design Context file so every future session stays on-brand.

Shared design contract

TikTok Design System

The shared design contract layer. Before any platform writes code, this skill stabilizes token semantics, component anatomy, hierarchy, and states — then routes work to the iOS or Web implementation skill.

23 opinionated tools

gstack

Garry Tan's exact Claude Code setup — 23 pre-built skills and slash commands for shipping startup software fast. We unpack three of them so you can see the shape of the whole kit.

Memory on disk

Planning with Files

A Manus-style skill that makes Claude write its plan into local .md files — so when you come back tomorrow, it reads the file and picks up exactly where you left off.

86 PM skills

Lenny Skills

86 product-management skills pulled from Lenny's Podcast episodes — one-shot expert checklists for user research, positioning, growth, pricing, and more. We feature three a designer-crossing-into-product would reach for first.

External guide

Writing Design Skills

A companion guide that walks through how to author your own design-focused Claude skill, step by step. Opens in a new tab.

1.

Paste a skill URL

Any GitHub tree link that points at a folder with a SKILL.md file works.

2.

We read the source

The worker fetches SKILL.md and every referenced file, preserving the verbatim text.

3.

Claude writes the course

A side-by-side reader streams back: source on the left, plain-English explanation on the right.