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Vol. 01 Issue 04 April 2026
The masterclass for builders inskillclaude.com
— The Builder's Masterclass

Stop searching.
Start building.

A practitioner-led course on Claude, Cowork, Skills, MCP and subagents — for engineers and operators who would rather ship than scroll.

Vol. 01 · 2026Haythem Rehouma — founder & instructorCover · Haythem Rehouma
— What you will build

The artifacts you walk away with — not slides, real things you can run, fork and ship the day you finish the masterclass.

~/build-list — what you will build
6 artifacts
claude --plan capstone --ship
  • A reusable Claude Project + custom instructions
  • A production-grade CLAUDE.md
  • 3 personal Skills (your own slash-commands)
  • A subagent pipeline for code review
  • An MCP integration with your DB or repo
  • A capstone project + verifiable certificate
— Editor's note
Most AI courses sell you slides. This one hands you a toolkit you'll still be using six months later — Skills you wrote, a CLAUDE.md you'll defend, a pipeline you'll trust.
— Haythem Rehouma, Senior Practitioner

The method.

Three principles that separate a working masterclass from a content farm. Every module reflects them — no exceptions.

N°01

Anthropic-specific

XML structure, Constitutional AI, Cowork briefs, MCP, Skills frontmatter — covered in depth, not as side notes after a generic GPT chapter.

N°02

Tool-first, not theory-first

Each module ends with a real artifact: a Skill, a CLAUDE.md, a subagent pipeline, an MCP integration. Theory only where theory pays.

N°03

Ship, don’t memorize

The capstone is a real project with deliverables. Your certificate is verifiable and the workflow stays useful long after.

The Skills Atlas

Beyond the course: a library of 1,441 playbooks.

A free, open catalogue of 1,441 reusable Claude skills across 71 categories — installable in Claude Code, Cursor, Codex CLI and Gemini CLI.

Search 1,441 skills…
S001Uncategorized

brainstorming

Use before creative or constructive work (features, architecture, behavior). Transforms vague ideas into validated designs through disciplined reasoning and collaboration.

Mediumcommunity
S002AI / ML

claude-api

Build apps with the Claude API or Anthropic SDK. TRIGGER when: code imports `anthropic`/`@anthropic-ai/sdk`/`claude_agent_sdk`, or user asks to use Claude API, Anthropic SDKs, or Agent SDK. DO NOT TRIGGER when: code imports `openai`/other AI SDK, general programming, or ML/data-science tasks.

Mediumgithub.com/anthropics
S003Security

security-auditor

Expert security auditor specializing in DevSecOps, comprehensive cybersecurity, and compliance frameworks.

Mediumcommunity
S004Front-End

frontend-design

You are a frontend designer-engineer, not a layout generator.

Mediumcommunity
S005Development & Testing

debugging-strategies

Transform debugging from frustrating guesswork into systematic problem-solving with proven strategies, powerful tools, and methodical approaches.

Safecommunity
S006Backend

api-design-principles

Master REST and GraphQL API design principles to build intuitive, scalable, and maintainable APIs that delight developers and stand the test of time.

Safecommunity
S007DevOps

terraform-skill

Terraform infrastructure as code best practices

Safegithub.com/antonbabenko
S008Automation

prompt-engineer

Transforms user prompts into optimized prompts using frameworks (RTF, RISEN, Chain of Thought, RODES, Chain of Density, RACE, RISE, STAR, SOAP, CLEAR, GROW)

Safecommunity

Simple, fair pricing.

Three days free, no card required. Cancel any time. Pricing is per learner; team plans on request.

Free

Trial

3 days, full access to Module 01.

$0/forever
  • Module 01: Discover Claude
  • 5 languages
  • Modules 02–12
  • Verifiable certificate
Start free
For builders

Expert

Full mastery — Claude Code, Skills, Subagents, MCP.

$490/yr
  • All 12 modules + capstone
  • Everything in Pro
  • Monthly group mentoring (max 8)
  • CLAUDE.md, Skills, Subagents, MCP
  • API + integrations
  • Expert certificate
Choose Expert

Field notes

Latest articles

Hands-on field guides on Claude Code, RAG, AI architecture and the workflows of AI-augmented developers.

  • Claude Code Mastery#12

    The Future of Agentic Development

    Where this is going in 2026 and beyond. What I'd bet on, what I would not, and the line where I get sceptical of the hype.

    Read
  • Claude Code Mastery#11

    Advanced Patterns — Hooks, MCP Servers, Custom Tools, System Prompts

    Once you've outgrown the defaults: hooks for deterministic side effects, MCP servers for org-specific data, custom tools, and system-prompt surgery.

    Read
  • Claude Code Mastery#10

    Team Workflows

    How engineering teams are actually integrating Claude Code today. The shared .claude/ folder, the review rituals, and the anti-patterns I keep seeing in the wild.

    Read
  • Claude Code Mastery#9

    Testing and Debugging

    Letting Claude Code own the entire test loop. Including the parts that make engineers nervous: regressions, flakies, integration tests, and the stack-trace whisperer.

    Read

Browse all articles

— Reader questions

Frequently asked.

Do I need a Claude account to start?+
No, you can sign up here first. To follow the labs you will need a free claude.ai account; a Claude paid plan is recommended from Module 06 onwards.
Haythem Rehouma — editor
— Editor's column

Who's writing this.

I'm Haythem Rehouma. I've spent the last decade shipping software, teaching engineers, and burning hours inside Anthropic's stack so you don't have to. This masterclass is what I wish I'd had on day one.

I won't pretend Claude is magic. I'll show you exactly where it earns its keep — and where it'll waste your afternoon. Every artifact you build here, I've shipped to production at least once.

10+ yrsEngineering & teaching
50+Projects shipped
5Languages I teach in
— Last call

Become the builder
your team needed yesterday.

Three days free, no card required. Keep your Skills, your CLAUDE.md and your habits — forever.

Begin Vol. 01 →