XDD is free and always will be. But building and maintaining it isn't. Back it with a ★ Support — $9 each, no subscription, no catch. Most people grab 3.

Want me to talk at your conference, podcast, or event? Get in touch.

XDD

Claude Code skills for active learning: spaced-repetition flashcards, Socratic drilling, and long-running mentorship — built to run inside Claude Code.

Start With the Philosophy

The skills below are tools. They only compound if you understand what they're for: AI is making syntax and productivity cheap, which means judgment, curiosity, and capability are what will actually set you apart. The book explains that philosophy before you touch a single skill — read it first, then come back and install.

Skills

Skill	What it does
xdd-capture	Scan a conversation or any source (file, URL, PR, pasted text) for learnable facts and turn approved ones into flashcards.
xdd-create	Make one flashcard from text, a source, or context, with approval before saving.
xdd-deck	Browse, edit, or remove flashcards in your deck.
xdd-quiz	Quiz on flashcards due today using SM-2 spaced repetition, grading and rescheduling each answer.
xdd-explain	Map a piece of code or any concept in context, then guide understanding through Socratic questions instead of explaining it outright. Takes an optional depth level. Multiple-choice by default.
xdd-review	Silently review a PR, then lead you to discover each finding yourself through targeted questions. Multiple-choice by default.
xdd-solve	Guide you to an answer through one Socratic question at a time — never states the answer outright. Multiple-choice by default.
xdd-challenge	Stress-test a plan or design by interrogating every decision point relentlessly.
xdd-mentor	Teach a skill or concept over many sessions in a plain-markdown workspace — builds a mission, curates resources, writes lessons, runs retrieval practice, tracks progress. Multiple-choice by default.

xdd-capture, xdd-create, xdd-deck, and xdd-quiz share a small flashcard backend (support/) — a SQLite-backed CLI and two contract docs the skills read to stay consistent.

Install

1. Install the skills with skills.sh:

   npx skills@latest add rebeloper/xdd
   

   Pick the skills you want and which agents to install them on.
2. Copy the flashcard backend into place — xdd-capture, xdd-create, xdd-deck, and xdd-quiz need this:

   mkdir -p ~/.claude/xdd
   curl -fsSL https://raw.githubusercontent.com/rebeloper/xdd/main/support/card-format.md -o ~/.claude/xdd/card-format.md
   curl -fsSL https://raw.githubusercontent.com/rebeloper/xdd/main/support/importance.md -o ~/.claude/xdd/importance.md
   curl -fsSL https://raw.githubusercontent.com/rebeloper/xdd/main/support/cards.js -o ~/.claude/xdd/cards.js
   

   The card database (~/.claude/xdd/cards.db) is created automatically on first use — nothing to seed.
3. Restart Claude Code (or start a new session) so it picks up the new skills.

Usage

Invoke any skill with its slash command, e.g. /xdd-quiz or /xdd-capture. Claude Code will also route to a skill automatically when your request matches its description.

License

MIT — see LICENSE.