Master Claude Code: From Installation to Advanced AI‑Powered Programming Assistant

Claude Code Overview

Claude Code is an AI‑powered programming assistant that combines Claude large‑language‑model reasoning with tool‑use capabilities. It is part of the Claude Certified Architect (CCA) program.

Installation

Supported platforms:

macOS (Homebrew): brew install --cask claude-code macOS / Linux / WSL: curl -fsSL https://claude.ai/install.sh | bash Windows CMD:

curl -fsSL https://claude.ai/install.cmd -o install.cmd && install.cmd && del install.cmd

After installation run claude and follow the authentication prompt.

Cloud integrations

AWS Bedrock – see https://code.claude.com/docs/en/amazon-bedrock

Google Cloud Vertex – see https://code.claude.com/docs/en/google-vertex-ai

Project setup

Install Node.js.

Download and unzip uigen.zip from the article resources.

Run npm run setup to install dependencies and create a local SQLite database.

Optional: place an Anthropic API key in .env at the project root to enable full Claude functionality. Without a key the project generates static example code.

Context management

Running /init in a new project creates CLAUDE.md, which summarises the project purpose, architecture, key commands and coding patterns. This file is included in every Claude request as a persistent system prompt.

File locations

CLAUDE.md

– generated by /init, committed to source control. CLAUDE.local.md – personal, not shared. ~/.claude/CLAUDE.md – global settings applied to all projects.

Custom instructions

Add directives directly to CLAUDE.md. Example:

# Limit comments to complex code only.

File references

Use @ followed by a path (e.g., @auth) to include a file’s content in a request. The same syntax works inside CLAUDE.md for reusable references.

How does the authentication system work? @auth

Modifying code

Paste a screenshot (Ctrl+V / Cmd+V) and ask Claude to make UI changes. Claude generates the required code changes, which can be applied with npm run dev. For complex changes enable Plan Mode (double‑Shift+Tab) to let Claude explore the codebase, produce a detailed plan and await approval before execution.

Think modes

Think

– basic reasoning. Think more – extended reasoning. Think a lot – comprehensive reasoning. Think longer – longer time budget. Ultrathink – maximum token allocation.

Specify the mode in the prompt, e.g., “Use ultrathink to explore the best implementation.”

Dialogue control

Press Escape to interrupt an off‑track response. Commands to manage context: /compact – summarises the conversation while preserving key knowledge. /clear – wipes the dialogue history for a fresh start.

Custom commands

Create a .claude/commands folder and add markdown files named after the desired command (e.g., audit.md creates /audit). Use $ARGUMENTS placeholders for parameters.

Run `npm audit` to check for vulnerabilities, then `npm audit fix`, and finally run tests to ensure nothing broke.

Write comprehensive tests for $ARGUMENTS using Vitest and React Testing Library.

Extending with MCP servers

Install a Model Context Protocol (MCP) server to give Claude new capabilities. Example – Playwright MCP for browser automation:

claude mcp add playwright npx @playwright/mcp@latest

This registers a server named playwright and provides the command to start it locally.

Using Playwright MCP

Ask Claude to navigate to localhost:3000, generate a component, review its visual style, and then update the prompt file ( @src/lib/prompts/generation.tsx) for better future outputs.

Navigate to `localhost:3000`, generate a basic component, review its style, then improve the generation prompt accordingly.

Permission management

Edit .claude/settings.local.json and add the server to the allow array:

{
  "permissions": {
    "allow": ["mcp__playwright"],
    "deny": []
  }
}

The double underscore links the permission to the playwright MCP.

Other MCP use cases

MCP servers exist for database interaction, API testing, filesystem operations, cloud service integration, and development‑tool automation, turning Claude into a full‑stack development partner.

Summary

By installing Claude Code, configuring the environment, managing context with CLAUDE.md, using plan/think modes, controlling dialogue flow, creating custom commands, and extending functionality with MCP servers, developers can integrate a secure, customizable AI programming assistant into modern development workflows.