Claude Code Tips — Get the Most from Claude's CLI in 2026

What Is Claude Code?

Claude Codeis Anthropic's official CLI for Claude. It runs in your terminal, reads your files, executes commands, and iterates on solutions. It's the most powerful way to use Claude for coding.

# Install Claude Code
npm install -g @anthropic-ai/claude-code

# Start a session
claude

# Ask a question
claude "fix the bug in auth.ts"

Tip 1: Use CLAUDE.md for Project Context

Create a CLAUDE.md file in your project root. Claude Code reads it automatically at the start of every session. Put your project context there:

# CLAUDE.md

## Project
This is a Next.js 16 app with Tailwind CSS and TypeScript.

## Architecture
- app/ — Next.js App Router pages
- components/ — React components
- lib/ — Utility functions and API clients

## Conventions
- Use functional components
- Prefer server components by default
- Use Tailwind for styling

Tip 2: Add Persistent Memory with Eidos

CLAUDE.md is static — you have to update it manually. For automatic persistent memory, use Eidos Memory:

# Install Eidos
npm install -g eidos-memory
eidos setup

# Use Claude Code with memory
eidos wrap claude "fix the auth bug"
# Claude now has full context about your project

Eidos automatically indexes your codebase, tracks decisions, and injects relevant context into every prompt. You get 95% token savings and Claude remembers everything across sessions.

Tip 3: Use MCP Servers for Extended Capabilities

Claude Code supports MCP servers. Add a memory server, a database server, or any custom tool:

# Add Eidos as MCP server
eidos mcp print-config --client claude-code --copy

# Now Claude can search your codebase, recall decisions,
# and access persistent memory via MCP tools

Tip 4: Be Specific in Your Prompts

Claude Code works best with specific, actionable prompts. Compare:

• Vague:"Something's broken"
• Better:"The login form returns 500 when email is empty"
• Best:"In auth.ts:handleLogin(), the validation fails silently when email is an empty string. Add proper error handling."

Tip 5: Use the Agentic Loop

Claude Code can iterate on solutions: plan, code, test, fix. Give it a goal and let it work:

claude "add user authentication with JWT tokens.
Use bcrypt for password hashing.
Add login, register, and refresh endpoints.
Write tests for all endpoints."

Claude will plan the implementation, write the code, run tests, and fix any failures automatically.

Tip 6: Reference Files with @filename

Claude Code can read files directly. Reference them in your prompts:

claude "look at @src/auth.ts and @src/middleware.ts
Add rate limiting to the login endpoint"

Tip 7: Use Headless Mode for Automation

Claude Code supports headless mode for CI/CD and automation:

# Run in headless mode
claude --print "review this PR" < pr.diff

# Use in CI/CD
claude --print "check for security vulnerabilities" --output-format json

The Bottom Line

Claude Code is the most powerful AI coding CLI available. Combine it with CLAUDE.md for static context, MCP servers for extended capabilities, and Eidos Memory for persistent memory across sessions. This setup gives you 10x productivity with 95% fewer tokens.