If You Installed Claude Code and Only Chat With It — You’re Missing the Point

You installed Claude Code. You type claude. A chat opens. You ask it to fix bugs and write tests.

If that’s where you stopped, you’re using maybe 20% of it.

Claude Code’s real power lives in three config files: CLAUDE.md, Hooks settings, and MCP server connections.

Set these up and the experience completely changes.

CLAUDE.md — Memory That Survives Sessions

Claude Code forgets everything when a session ends.

You taught it “always use the -v flag with pytest” yesterday? Gone.

CLAUDE.md fixes this.

Drop a CLAUDE.md file in your project root. Claude Code reads it automatically when a session starts.

# Project Guide

## Dev Rules
- Always run tests with `pytest tests/ -v`
- Create backups before any DB operations
- Commit messages use feat/fix/docs prefixes

## Tech Stack
- Python 3.11, FastAPI, PostgreSQL
- Frontend: Next.js 14 App Router

Hooks — Automation That Never Forgets

Hooks force shell commands to run at specific lifecycle points.

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "jq -r '.tool_input.file_path' | { read f; if echo \"$f\" | grep -qE '\\.(ts|tsx)$'; then npx prettier --write \"$f\" 2>/dev/null; fi; }"
          }
        ]
      }
    ]
  }
}

Blocking example:

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "python3 -c \"import json,sys; d=json.load(sys.stdin); p=d.get('tool_input',{}).get('file_path',''); sys.exit(2 if '.env' in p else 0)\""
          }
        ]
      }
    ]
  }
}

MCP — Plug New Abilities Into Claude Code

# GitHub
claude mcp add github -s user \
  -e GITHUB_PERSONAL_ACCESS_TOKEN=your-token \
  -- npx -y @modelcontextprotocol/server-github

# Context7
claude mcp add context7 -s user -- npx -y @upstash/context7-mcp@latest

# Playwright
claude mcp add playwright -s project -- npx -y @playwright/mcp@latest

# PostgreSQL
claude mcp add postgres -s project \
  -e DATABASE_URL="postgresql://user:pass@localhost:5432/mydb" \
  -- npx -y @modelcontextprotocol/server-postgres

Use -s user for global tools, and -s project for project-specific tools.

Put All Three Together

• CLAUDE.md teaches rules
• Hooks enforce quality
• MCP extends capabilities

Thirty minutes of setup saves you time every single day after that.

Claude Code’s real power isn’t in the conversation. It’s in the configuration.