Module 12 — Building your own tools

Name: Harness Engineering — Claude Code Mastery
Price: 89 EUR
Availability: InStock

In this module

You will learn to build your own MCP servers (local and remote), package a complete Claude Code plugin with commands, skills, hooks and agents, and orchestrate advanced workflows.

Contents

12.1 — Why build your own tools Key takeaways 12.2 — Architecture of an MCP server Key takeaways

12.3 — Building a local MCP server (stdio) Key takeaways 12.4 — Remote MCP server (HTTP) Key takeaways 12.5 — Anatomy of a Claude Code plugin Key takeaways 12.6 — Slash commands and skills Etapes Format du rapport Critiques (bloquants) Suggestions (non-bloquants) Points positifs Conventions de nommage Regles d'architecture Key takeaways 12.7 — Hooks: automating reactions Key takeaways 12.8 — Custom agents and orchestration Regles Key takeaways 12.9 — Claude as an MCP server Key takeaways 12.10 — Advanced patterns: composition and agent teams Key takeaways

12.1 — Why build your own tools Key takeaways 12.2 — Architecture of an MCP server Key takeaways

12.1 — Why build your own tools

Claude Code covers most needs with its native tools: Read, Edit, Bash, Grep, Glob, Write. But your domain context always ends up exceeding what a generic tool can offer. Your internal API, your proprietary database, your in-house deployment pipeline -- no community tool knows them as well as you do.

The Claude Code ecosystem was designed as an open platform. The Model Context Protocol (MCP) is a standardized protocol that lets any developer create tools that Claude Code will discover and use as naturally as its built-in tools. It is not a late addition: it is an architectural pillar.

Building your own tools addresses three families of needs. Integration: connecting Claude Code to your internal systems -- your

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