Claude Code Advanced: CLAUDE.md and MCP Configuration Guide - 2026

Claude Code's basic usage is simple, but true power users rely on CLAUDE.md and MCP tools. This article walks you through mastering both, doubling Claude Code's efficiency and accuracy.

💡 What You Will Learn

Claude Code's basic usage is simple, but true power users rely on CLAUDE.md and MCP tools. This article walks you through mastering both, doubling Claude Code's efficiency and accuracy.

📜 Table of Contents

• ---
• Hands-OnResultsComparison
• MCP What Is
• Configuration MCP
• Notes
• Summary
• |:----|:-----------|:--------|

---

# Project conventions

## Tech Stack
- Frontend: React 18 + TypeScript + TailwindCSS
- Backend: Node.js + Express + SQLite
- Vitest

## 
- TypeScript 
-  + Hooks
- async/await 
- 80 

## 
- PascalCase
- /camelCase
- UPPER_SNAKE_CASE
- kebab-case

## 
src/
  components/    # UI 
  hooks/         #  Hooks
  utils/         # 
  types/         # 
  pages/         # 

|:----|:-----|:-----|

# General-purpose

-  README
-  npm package.json  pip
- 
-  Conventional Commits 
- 

Hands-OnResultsComparison

Claude login.php ...
 Next.js

Claude CLAUDE.md → Next.js + TypeScript
 src/pages/api/auth/ ...

MCP What Is

Configuration MCP

{
  "mcpServers": {
    "sqlite": {
      "command": "uvx",
      "args": ["mcp-server-sqlite", "--db-path", "./data.db"]
    },
    "filesystem": {
      "command": "npx",
      "args": ["-y", "@anthropic/mcp-server-filesystem", "./data"]
    }
  }
}

 users 

 Express 

 APIhttps://api.openweathermap.org/...
Return value

|:-----------|:-----|:-----| | mcp-server-sqlite || uvx mcp-server-sqlite | | mcp-server-filesystem || npx @anthropic/mcp-server-filesystem | | mcp-server-github || uvx mcp-server-github | | mcp-server-puppeteer || npx @anthropic/mcp-server-puppeteer | | mcp-server-postgres || uvx mcp-server-postgres |

# Installation/Setup uv
curl -LsSf https://astral.sh/uv/install.sh | sh

# Configuration .claude/settings.json 

template/
  CLAUDE.md       # Project conventions
  .claude/
    settings.json  # MCP 
  README.md        # 

{
  "test": "Testing",
  "deploy": "Deployment Vercel",
  "review": ""
}

/test

 @src/utils/api.ts 
 @src/types/api.ts 

Notes

Summary

|:----|:-----------|:--------|