Claude Code Cheatsheet

Complete reference for Anthropic's agentic coding assistant

Claude Code is an agentic coding tool that lives in your terminal. It understands your codebase, can edit files, run commands, and help you code faster with AI. This cheatsheet covers CLI commands, keyboard shortcuts, configuration, MCP integrations, hooks, subagents, skills, plugins, and best practices.

175

Commands

Quick Workflow

1. Install

npm i -g @anthropic-ai/claude-code

2. Start

cd project && claude

3. Context

@file or @dir/

4. Task

"fix the bug"

5. Review

verify changes

6. Clear

/clear

CLAUDE.md Memory File

# Project Context

## Tech Stack
- Next.js 15 with App Router
- TypeScript, Tailwind CSS

## Commands
- `pnpm dev` - Start dev server
- `pnpm test` - Run tests

## Coding Standards
- Use TypeScript for all new code
- Follow ESLint configuration

Auto-Format Hook

{
  "hooks": {
    "PostToolUse": [{
      "matcher": "Edit|Write",
      "hooks": [{
        "type": "command",
        "command": "npx prettier --write $FILE_PATH"
      }]
    }]
  }
}

Custom Slash Command

.claude/commands/review.md:

---
allowed-tools: Read, Grep, Glob
description: Review code for issues
argument-hint: [file-or-feature]
---

Review this code for:
1. Security vulnerabilities
2. Performance issues
3. Best practices

Focus on: $ARGUMENTS

Subagent Definition

.claude/agents/code-reviewer.md:

---
name: code-reviewer
description: Expert code review. Use proactively after writing code.
tools: Read, Grep, Glob
model: inherit
---

You are a senior code reviewer.
Review checklist:
- Code is simple and readable
- Proper error handling
- No exposed secrets
- Good test coverage

Permission Settings

.claude/settings.json:

{
  "permissions": {
    "allow": [
      "Bash(npm run *)",
      "Bash(git *)"
    ],
    "deny": [
      "Read(./.env*)",
      "Read(./secrets/**)",
      "Bash(rm -rf:*)",
      "Bash(curl:*)"
    ]
  }
}

MCP Configuration

.mcp.json:

{
  "mcpServers": {
    "github": {
      "command": "npx",
      "args": ["-y", "@anthropic-ai/mcp-server-github"],
      "env": { "GITHUB_TOKEN": "${GITHUB_TOKEN}" }
    },
    "notion": {
      "transport": "http",
      "url": "https://mcp.notion.com/mcp"
    }
  }
}

Pricing Tiers

Pro - $20/mo

Medium-high workload, limited Opus

Max5 - $100/mo

5x tokens, full Opus access

Max20 - $200/mo

20x tokens, larger context

💡 Sessions last 5 hours. Opus burns tokens faster. Use /clear between tasks and separate sessions for different work.

Resources

Official Docs →GitHub →MCP Protocol →Awesome Claude →Claude Code Course →

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