7 Advanced Claude Code Tips Most Developers Don't Know

Claude Code is more than just an AI terminal. After using it daily for months, I noticed most developers only tap into 20% of its capabilities. Here are 7 advanced features you should master today.

1. CLAUDE.md - The Project Brain

This is the most important file, yet most developers do not use it properly. CLAUDE.md is a context file Claude reads automatically at the start of every new session - like briefing a new team member before they start working.

What should go in CLAUDE.md:

• Tech stack and conventions: Next.js 16 App Router, bun, Tailwind CSS 4, shadcn/ui, no React.FC
• Session start protocol: run git log --oneline -5 first, which files to read
• Coding conventions: kebab-case file names, @/ alias, no ../../
• Known issues: existing type debt, why ignoreBuildErrors: true
• Model selection rules: Haiku for search, Sonnet for implementation, Opus only for architecture

If Claude keeps asking basic questions about your project, that is a sign your CLAUDE.md is incomplete. A good file reduces token waste by 50% per session.

2. Custom Agents - Domain Specialists

Instead of using Claude Code for everything in one conversation, create specialized agents in .claude/agents/. Each agent has its own system prompt and runs independently with its own context window.

.claude/agents/
├── security-reviewer.md    # audits security issues only
├── seo-reviewer.md         # checks SEO for public pages
├── accessibility-reviewer.md
└── code-reviewer.md        # reviews diffs before commits

When you add a new form, call the accessibility-reviewer - this agent is not polluted by your main conversation context, producing much more focused results.

3. Slash Commands - Reusable Workflows

Slash commands are workflows packaged as Markdown files in .claude/commands/. Instead of memorizing procedures every time, just type /command-name.

/deploy-check      # complete checklist before deploying to production
/new-article       # create a new blog post with correct format
/db-migrate        # run Prisma migrations safely with verification
/pr-review         # review PR: security, perf, a11y checklist

4. Memory System - Persistence Across Sessions

The memory system uses persistent files in ~/.claude/projects/. Four types: user (your background), feedback (what Claude should avoid - most important), project (decisions), reference (external system links).

5. Plan Mode - Design Before You Code

For complex multi-file tasks, enable Plan Mode first. In Plan Mode, Claude can only read files and research - no code editing. After you approve the plan, Claude implements exactly what was agreed upon.

6. Hooks - Automate Everything

Hooks are shell commands that run automatically when Claude performs specific actions. Configure in .claude/settings.json. Use them to auto-format files, run linters, validate schemas, or notify Slack.

7. Smart Model Selection - Cut Costs by 10x

Haiku: search, grep, file reads. Sonnet: implementation, debugging (default). Opus: architecture, complex debugging (most expensive). Default subagents to Haiku - this is the single biggest cost saving.

Where to Start?

1. Write CLAUDE.md for your current project - 15 minutes, immediate impact
2. Create 1-2 slash commands for your most repeated workflows
3. Write feedback memory entries after every Claude mistake