Claude Code Cheat Sheet - Shortcuts, Commands, Tips [2026]

Claude Code is Anthropic’s AI-powered CLI tool that reads your codebase, edits files, runs commands, and manages git workflows directly from the terminal. It operates as an agentic coding assistant – you describe what you want in plain English, and it figures out which files to read, what commands to run, and what changes to make. This cheat sheet covers every command, shortcut, configuration option, and workflow pattern you need to be productive with Claude Code.

Original content from computingforgeeks.com - post 162997

This cheat sheet is also available as a GitHub repository you can star, fork, and reference offline. Contributions and suggestions are welcome there.

Installation

Install Claude Code on macOS, Linux, or Windows (WSL):

curl -fsSL https://claude.ai/install.sh | bash

On macOS via Homebrew:

brew install --cask claude-code

On Windows (PowerShell):

irm https://claude.ai/install.ps1 | iex

Verify and authenticate:

claude --version
claude auth login

Keyboard Shortcuts

These work in the interactive Claude Code terminal. This is the most-referenced section – bookmark it.

Essential Shortcuts

Shortcut	Action
`Ctrl+C`	Cancel current generation or input
`Ctrl+D`	Exit Claude Code
`Ctrl+L`	Clear terminal screen
`Ctrl+R`	Reverse search command history
`Esc + Esc`	Rewind to previous checkpoint (undo)
`Shift+Tab`	Cycle permission modes (default/plan/yolo)
`Ctrl+G`	Open input in external editor (vim, etc.)
`Ctrl+O`	Toggle verbose output
`Ctrl+T`	Toggle task list
`Ctrl+F`	Kill all background agents (press twice)

Input and Editing

Shortcut	Action
`\ + Enter`	New line (multiline input) – works on macOS, Linux, and Windows
`Option+Enter` (Mac) / `Alt+Enter` (Linux/Win)	New line (platform default)
`Shift+Enter`	New line (iTerm2, WezTerm, Ghostty, Kitty, Windows Terminal)
`Ctrl+K`	Delete to end of line
`Ctrl+U`	Delete entire line
`Ctrl+Y`	Paste deleted text
`Alt+B` / `Alt+F`	Move cursor back/forward one word (all platforms)
`Cmd+V` (Mac) / `Ctrl+V` (Linux/Win)	Paste image from clipboard
`Up/Down`	Navigate command history

Model and Mode Switching

Shortcut	Action
`Option+P` (Mac) / `Alt+P` (Linux/Win)	Switch model (Sonnet/Opus/Haiku)
`Option+T` (Mac) / `Alt+T` (Linux/Win)	Toggle extended thinking
`Shift+Tab` / `Alt+M`	Cycle permission mode (all platforms)
`?`	Show all available shortcuts

Quick Prefixes

Prefix	Action
`/`	Open slash command menu
`!`	Run bash command directly
`@`	Autocomplete file path mention

Slash Commands Reference

Session and Context Management

Command	What It Does
`/clear`	Wipe conversation history and free context window
`/compact [focus]`	Summarize conversation to free context – optionally focus on specific topic
`/cost`	Show token usage and API cost for current session
`/context`	Visualize what is consuming your context window
`/resume`	Pick and resume a previous session
`/rename [name]`	Name current session for easy resuming later
`/rewind`	Rewind to a previous checkpoint
`/diff`	View interactive diff of all changes made
`/copy`	Copy last response to clipboard
`/export [file]`	Export conversation as text file

Configuration and Model

Command	What It Does
`/model [name]`	Switch model (sonnet, opus, haiku)
`/effort [level]`	Set reasoning effort (low, medium, high, max)
`/config`	Open settings interface
`/permissions`	View and manage tool permissions
`/mcp`	Manage MCP server connections
`/terminal-setup`	Configure terminal keybindings for your shell
`/theme`	Change color theme
`/vim`	Toggle vim keybinding mode

Project and Code Tools

Command	What It Does
`/init`	Initialize project – generates CLAUDE.md with project context
`/memory`	View and edit CLAUDE.md files and auto-memory
`/security-review`	Scan pending changes for security vulnerabilities
`/simplify`	Review changed code for quality issues and suggest improvements
`/pr-comments [PR]`	Fetch and address GitHub PR review comments
`/add-dir [path]`	Add another directory to the working context
`/plan`	Enter plan mode – read-only exploration before making changes
`/batch [task]`	Run large-scale changes across 5-30 parallel git worktrees
`/debug [description]`	Troubleshoot problems in the current session

System and Account

Command	What It Does
`/help`	Show all available commands
`/doctor`	Diagnose installation, settings, auth, and MCP issues
`/insights`	Generate session analysis report – patterns, efficiency, suggestions
`/status`	Show version, model, and account info
`/login` / `/logout`	Sign in or out
`/bug`	Submit a bug report with session logs
`/stats`	View usage patterns, daily streaks, and session history
`/usage`	Show plan usage and rate limits
`/release-notes`	View changelog for current version
`/loop [interval] [prompt]`	Run a prompt or command on a recurring schedule
`/voice`	Toggle push-to-talk voice dictation (hold Space)
`/schedule`	Create, update, list, or run scheduled remote agents (cron tasks)
`/fast`	Toggle fast mode (same model, faster output)
`/hooks`	View and manage configured hooks
`/desktop`	Hand off current session to the Desktop app
`/teleport`	Pull a web/iOS session into your terminal

CLI Flags – Non-Interactive and Automation

Starting Sessions

# Start interactive session
claude

# Start with initial prompt
claude "refactor the auth module"

# Continue most recent session
claude -c

# Resume specific session by name
claude -r "auth-refactor"

# Name a session for later
claude -n "feature-payments"

# Run in isolated git worktree
claude -w feature-branch

# Run in worktree with tmux panes
claude -w feature-branch --tmux

# Resume session linked to a GitHub PR
claude --from-pr 42

# Fork a session (new ID, keeps context)
claude -c --fork-session

# Enable auto mode (AI decides permissions)
claude --permission-mode auto

# Bare mode (skip hooks, plugins, auto-memory)
claude --bare

Print Mode (Non-Interactive / Piping)

The -p flag runs Claude Code non-interactively – it processes the prompt and exits. This is the key to integrating Claude Code into scripts, CI/CD pipelines, and Unix pipes:

# Simple query
claude -p "explain this error in server.log"

# Pipe input
cat error.log | claude -p "what caused this crash?"

# Git diff review
git diff main | claude -p "review for security issues"

# JSON output for scripting
claude -p "list all TODO comments" --output-format json

# Structured output with schema validation
claude -p "extract function names from auth.py" \
  --output-format json \
  --json-schema '{"type":"object","properties":{"functions":{"type":"array","items":{"type":"string"}}}}'

# Auto-approve tools (careful with this)
claude -p "run tests and fix failures" --allowedTools "Bash,Read,Edit"

# Set spending limit
claude -p "refactor the API layer" --max-budget-usd 5.00

# Limit turns
claude -p "fix the bug" --max-turns 3

# Fallback model when primary is overloaded
claude -p "review this code" --fallback-model haiku

# Restrict available tools
claude -p "analyze this" --tools "Read,Grep,Glob"

# Block specific tools (deny list)
claude -p "refactor auth module" --disallowedTools "Bash(rm:*),Bash(sudo:*)"

# Override system prompt entirely
claude -p "review this code" --system-prompt "You are a security auditor. Focus only on vulnerabilities."

# Append to default system prompt
claude -p "explain this function" --append-system-prompt "Always include time complexity analysis."

# Load MCP servers from external config file
claude -p "check open issues" --mcp-config ./ci-mcp.json

# Disable session persistence (ephemeral, for CI/CD)
claude -p "run lint check" --no-session-persistence

# Debug mode (logs API calls, tool usage, timings)
claude -p "fix the build" --debug

# Debug with category filter
claude -p "fix the build" --debug "api,hooks"

# Write debug output to a file
claude -p "fix the build" --debug-file /tmp/claude-debug.log

# Select a specific agent
claude -p "review auth.py" --agent code-reviewer

# Enable Chrome debugging integration
claude --chrome

Model and Effort Flags

# Use specific model
claude --model opus
claude --model sonnet
claude --model haiku

# Set reasoning effort
claude --effort high    # More thorough (costs more)
claude --effort low     # Faster, cheaper

# Custom system prompt
claude --append-system-prompt "Always use TypeScript. Never use any."

# Load system prompt from file
claude --append-system-prompt-file ./coding-rules.txt

CLAUDE.md – Project Instructions

CLAUDE.md is the single most important file for customizing Claude Code behavior on a per-project basis. It is loaded automatically at the start of every session.

File Locations and Scope

Location	Scope	Shared with Team?
`./CLAUDE.md`	This project only	Yes (commit to git)
`./.claude/CLAUDE.md`	This project only	Yes (commit to git)
`~/.claude/CLAUDE.md`	All your projects	No (personal)
`.claude/rules/*.md`	Path-specific rules	Yes (commit to git)

Example CLAUDE.md

vi CLAUDE.md

Add your project instructions:

# My Project

## Build and Test
- Run tests: `npm test`
- Build: `npm run build`
- Lint: `npm run lint`

## Code Style
- Use TypeScript strict mode
- Prefer functional components in React
- All API responses must include error handling
- Never commit .env files

## Architecture
- Backend: Express.js + PostgreSQL
- Frontend: React + TailwindCSS
- Auth: JWT tokens stored in httpOnly cookies

See @README.md for project overview.
See @package.json for available scripts.

The @filename syntax imports content from other files – Claude reads them automatically.

Path-Specific Rules

Rules that only apply to certain files. Create .claude/rules/api.md:

vi .claude/rules/api.md

Add frontmatter with path patterns:

---
paths:
  - "src/api/**/*.ts"
---

# API Rules
- All endpoints must validate input with Zod
- Return proper HTTP status codes
- Include rate limiting on public endpoints

Generate a CLAUDE.md automatically for any project with /init.

Permission Modes

Claude Code asks permission before running commands or editing files. Toggle between modes with Shift+Tab:

Mode	Behavior	Use Case
default	Prompts on first use of each tool	Normal interactive work
plan	Read-only – no edits, no commands	Safe exploration and planning
acceptEdits	Auto-approves file edits, prompts for commands	Trusted editing sessions
dontAsk	Auto-denies unless pre-approved	Strict control
auto	AI classifier decides allow/deny per tool call	Trusted projects with clear CLAUDE.md rules
bypassPermissions	Skips all prompts (dangerous)	Containers/sandboxes only

Pre-Approve Specific Tools

In .claude/settings.json or via the CLI:

# Allow git commands and file reads without prompting
claude --allowedTools "Read,Bash(git *)"

# Block dangerous tools explicitly
claude --disallowedTools "Bash(rm:*),Bash(sudo:*),Bash(chmod:*)"

# Combine both: allow some, block others
claude --allowedTools "Bash(git:*),Read,Edit" --disallowedTools "Bash(rm -rf:*)"

Or in settings:

vi .claude/settings.json

Add permission rules:

{
  "permissions": {
    "allow": [
      "Read",
      "Bash(git *)",
      "Bash(npm run *)",
      "Bash(docker compose *)"
    ],
    "deny": [
      "Bash(rm -rf *)"
    ]
  }
}

Models and Effort Levels

Model	Best For	Speed
sonnet (Claude Sonnet 4.6)	Daily coding – edits, refactors, tests	Fast
opus (Claude Opus 4.6)	Complex architecture, debugging, multi-file changes	Slower
haiku (Claude Haiku 4.5)	Simple tasks, quick questions	Fastest

Switch models mid-session with /model opus or Option+P (Mac) / Alt+P (Linux/Windows).

Effort levels control how much reasoning Claude applies:

Level	Use Case
`/effort low`	Simple questions, quick lookups
`/effort medium`	Default – balanced speed and quality
`/effort high`	Complex debugging, architecture decisions
`/effort max`	Hardest problems (Opus only, unlimited thinking budget)

MCP Servers – Extend Claude Code

MCP (Model Context Protocol) lets Claude Code connect to external tools and data sources. Configure servers in .mcp.json at the project root or ~/.claude/.mcp.json for all projects.

vi .mcp.json

Example configuration with GitHub and PostgreSQL servers:

{
  "mcpServers": {
    "github": {
      "type": "stdio",
      "command": "npx",
      "args": ["@modelcontextprotocol/server-github"],
      "env": {
        "GITHUB_PERSONAL_ACCESS_TOKEN": "$GITHUB_TOKEN"
      }
    },
    "postgres": {
      "type": "stdio",
      "command": "npx",
      "args": ["@modelcontextprotocol/server-postgres"],
      "env": {
        "DATABASE_URL": "postgresql://user:pass@localhost:5432/mydb"
      }
    }
  }
}

Manage MCP connections with /mcp in the interactive session or pass a config file on the CLI:

# Load MCP servers from an external config
claude --mcp-config ./team-mcp.json

# Load multiple configs
claude --mcp-config ./github-mcp.json ./db-mcp.json

# Ignore all other MCP sources, only use this config
claude --mcp-config ./ci-mcp.json --strict-mcp-config

The --mcp-config flag is useful in CI/CD where you need consistent MCP server configuration across runs. --strict-mcp-config ensures only the specified servers are loaded, ignoring any from .mcp.json or user settings.

Custom Skills – Your Own Slash Commands

Skills are reusable prompts that show up as slash commands. Create them at .claude/skills/ (project) or ~/.claude/skills/ (personal).

Example – create a deploy skill:

mkdir -p .claude/skills/deploy
vi .claude/skills/deploy/SKILL.md

Add the skill definition:

---
name: deploy
description: Deploy the application to production
argument-hint: "[environment]"
user-invocable: true
---

Deploy the application to the $0 environment (default: staging).

Steps:
1. Run the test suite
2. Build the production bundle
3. Deploy using the deploy script
4. Verify the deployment health check

Now use it: /deploy production

Custom Subagents

Subagents are specialized AI agents that Claude can delegate tasks to. Create them at .claude/agents/:

mkdir -p .claude/agents/code-reviewer
vi .claude/agents/code-reviewer/AGENT.md

Define the agent:

---
name: code-reviewer
description: Expert code reviewer. Use proactively after code changes.
tools: Read, Grep, Glob, Bash
model: sonnet
---

You are a senior code reviewer. When reviewing code:
- Check for security vulnerabilities (SQL injection, XSS, etc.)
- Verify error handling is complete
- Flag any hardcoded secrets or credentials
- Suggest performance improvements
- Check for proper input validation

Claude automatically delegates code review tasks to this agent, or you can invoke it directly with @code-reviewer check my latest changes.

From the CLI, select an agent for the entire session:

# Use a named agent from .claude/agents/
claude --agent code-reviewer

# In print mode (CI/CD)
claude -p "review the latest commit" --agent code-reviewer

# Define agents inline (no files needed)
claude --agents '{"qa": {"description": "QA tester", "prompt": "You are a QA engineer. Write test cases for every change."}}'

Hooks – Automation Triggers

Hooks run shell commands automatically in response to Claude Code events. Configure in .claude/settings.json:

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "npx prettier --write $(jq -r '.tool_input.file_path')"
          }
        ]
      }
    ],
    "Notification": [
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": "osascript -e 'display notification \"Claude needs input\" with title \"Claude Code\"'"
          }
        ]
      }
    ]
  }
}

Common hook events: SessionStart, PreToolUse, PostToolUse, Stop, Notification, UserPromptSubmit.

Context Window Management

Claude Code has a finite context window. Managing it well is the difference between a productive session and hitting walls.

Key Commands

Command	When to Use
`/compact`	Summarize conversation to free space mid-task
`/compact Focus on auth module`	Summarize but keep specific context intact
`/clear`	Complete reset between unrelated tasks
`/context`	See what is consuming your context

Tips for Long Sessions

Use /clear between unrelated tasks – do not carry old context into new work
Run /compact proactively when you notice slowdowns
Use subagents for verbose operations (test runs, log analysis) – their output stays in the subagent context
Move detailed instructions to skills instead of typing them every time
Keep CLAUDE.md under 200 lines – move details to separate files and import with @filename

Git Worktrees – Parallel Work

Work on multiple tasks simultaneously without branch switching conflicts:

# Start Claude in a new worktree
claude -w feature-auth

# Batch changes across many files in parallel
/batch migrate all components from class-based to functional

The -w flag creates an isolated git worktree. Changes happen in the worktree without affecting your main working directory. When the agent finishes, merge the worktree branch back.

Settings File Reference

File	Scope
`.claude/settings.json`	Project (shared via git)
`.claude/settings.local.json`	Project (gitignored, personal)
`~/.claude/settings.json`	All projects (personal)

Common settings:

{
  "model": "sonnet",
  "effortLevel": "medium",
  "defaultMode": "default",
  "autoMemoryEnabled": true,
  "permissions": {
    "allow": ["Read", "Bash(git *)"],
    "deny": ["Bash(rm -rf *)"]
  }
}

Environment Variables

Variable	Purpose
`ANTHROPIC_MODEL`	Default model (e.g., `opus`)
`ANTHROPIC_API_KEY`	API key for direct API access
`CLAUDE_CODE_EFFORT_LEVEL`	Default effort (low/medium/high/max)
`CLAUDE_CODE_DISABLE_AUTO_MEMORY`	Set to `1` to disable auto-memory
`CLAUDE_CODE_DISABLE_1M_CONTEXT`	Set to `1` to disable 1M token context
`MAX_THINKING_TOKENS`	Custom thinking budget (default varies)
`HTTPS_PROXY`	HTTP proxy for corporate networks

File Structure Reference

# User-level (personal, all projects)
~/.claude/
  settings.json          # Global settings
  keybindings.json       # Custom keyboard shortcuts
  CLAUDE.md              # Personal instructions
  rules/                 # Personal rules
  agents/                # Personal subagents
  skills/                # Personal skills
  .mcp.json              # Global MCP servers

# Project-level (shared with team)
.claude/
  settings.json          # Project settings (git tracked)
  settings.local.json    # Local overrides (gitignored)
  CLAUDE.md              # Project instructions
  rules/                 # Path-specific rules
  agents/                # Project subagents
  skills/                # Project skills
.mcp.json                # Project MCP servers
CLAUDE.md                # Project instructions (alternative location)

Practical Workflow Tips

Start Every Project Right

# In your project root
claude
/init

This scans your project and generates a CLAUDE.md with build commands, test instructions, and code conventions. Review and edit it – this file shapes every future interaction.

Plan Before You Build

Press Shift+Tab to enter plan mode before asking Claude to make changes. In plan mode, Claude reads and analyzes but cannot edit anything. Once you approve the plan, switch back to default mode and say “implement the plan”.

Undo Mistakes Instantly

Press Esc + Esc to open the rewind menu. Choose “Restore code and conversation” to undo both the code changes and the conversation that led to them. This is faster than git stash for quick experiments.

Pipe Everything

# Analyze logs
tail -500 /var/log/app.log | claude -p "find the root cause of errors"

# Review a PR
gh pr diff 42 | claude -p "security review this PR"

# Generate commit message
git diff --staged | claude -p "write a conventional commit message" --model haiku

# Translate
cat README.md | claude -p "translate to Japanese" > README.ja.md

# Docker container analysis
docker ps --format json | claude -p "which containers are using the most resources?"

# Kubernetes pod debugging
kubectl logs deployment/api --tail=200 | claude -p "why are requests failing?"

# Database structure review
pg_dump --schema-only mydb | claude -p "suggest index improvements"

# Summarize recent commits
git log --oneline -20 | claude -p "write release notes from these commits"

# Find config issues
cat /etc/nginx/nginx.conf | claude -p "check for misconfigurations"

For deeper walkthroughs of Docker and Kubernetes workflows with Claude Code, see the Docker guide and Kubernetes guide.

Automation Scripts

Chain multiple claude -p calls in a bash script for repeatable workflows:

#!/bin/bash
# Automated PR review pipeline
git diff HEAD~1 > /tmp/diff.txt
cat /tmp/diff.txt | claude -p "review for security issues" --model sonnet > security_review.md
cat /tmp/diff.txt | claude -p "check for performance regressions" --model sonnet > perf_review.md
cat /tmp/diff.txt | claude -p "write a one-paragraph summary" --model haiku > summary.md

Batch process multiple files:

#!/bin/bash
# Generate docstrings for all Python files missing them
for f in $(grep -rL '"""' src/*.py); do
  claude -p "add docstrings to functions missing them in $f" \
    --allowedTools "Read,Edit" --max-turns 3
done

Generate a changelog from git tags:

git log v1.0.0..v2.0.0 --oneline | \
  claude -p "create a changelog grouped by feature, fix, and chore" \
  --output-format text > CHANGELOG.md

Side Questions with /btw

Need to ask something without derailing the current task? Use /btw:

/btw what was the name of that config file we edited earlier?

The response is ephemeral (not saved to context), low-cost (uses cache), and does not use any tools.

Cost Control

Use /cost to check spend at any time
Use Sonnet for most work, Opus only for complex problems
Use /effort low for simple tasks
Run /compact to reduce context size (fewer tokens per request)
Be specific in prompts – vague requests cause more back-and-forth
Use --max-budget-usd 5.00 in CI/CD to prevent runaway costs

Prompting Tips – Get Better Results

The quality of Claude Code’s output depends heavily on how you prompt it. These patterns consistently produce better results.

Be Specific, Not Vague

Bad Prompt	Good Prompt
“fix the bug”	“the login endpoint returns 500 when email contains a plus sign – fix the input validation in src/auth/login.ts”
“make it faster”	“the /api/users endpoint takes 3s on 10k rows – add database indexing and pagination”
“write tests”	“write unit tests for the calculateDiscount function in src/pricing.ts covering edge cases: zero price, negative quantity, expired coupon”
“clean up the code”	“extract the duplicate validation logic in src/api/orders.ts and src/api/returns.ts into a shared validator”

Use Plan Mode First

For complex tasks, switch to plan mode (Shift+Tab) and ask Claude to explore before coding:

# In plan mode:
"I need to add OAuth2 login with Google. Look at the existing auth flow
in src/auth/ and propose where to add the Google provider without
breaking the current email/password login."

Review the plan, then switch back to default mode and say “implement the plan”.

Give Verification Targets

Tell Claude how to verify its own work:

"Add rate limiting to the /api/auth endpoints. After implementing,
run npm test to make sure nothing breaks, and verify the rate limiter
works by checking the middleware is registered in the Express app."

Use @file Mentions for Context

Point Claude at specific files instead of making it search:

"look at @src/db/schema.ts and @src/api/users.ts - the User model
has a new 'role' field in the schema but the API doesn't expose it.
Add the role field to the GET /users/:id response."

Course-Correct Early

If you see Claude going in the wrong direction, press Ctrl+C to stop and redirect. Do not wait for it to finish a large wrong change – interrupt and clarify. If it already made bad changes, press Esc + Esc to rewind.

Break Large Tasks Into Steps

Instead of “build a user management system”, split it:

“Create the User database schema with id, email, name, role, created_at”
“Add CRUD API endpoints for users with input validation”
“Write tests for the user endpoints”
“Add role-based access control middleware”

Each step gets verified before moving to the next. This avoids wasting tokens on a bad foundation.

Token Saving Strategies

Every message sent to Claude includes the full conversation context. Larger context means higher cost and slower responses. These strategies keep your sessions efficient.

Context Hygiene

Strategy	How	Savings
Clear between tasks	`/clear` when switching to unrelated work	Biggest impact – resets to zero
Compact proactively	`/compact Focus on the auth module changes`	Keeps relevant context, drops noise
Check context usage	`/context` to see what is consuming space	Identifies bloat sources
Use @file mentions	`@src/auth.ts` instead of “find the auth file”	Avoids exploratory file reads
Use subagents	Delegate verbose tasks (test runs, log analysis)	Output stays in subagent context

Model Selection

Task	Model	Effort
Simple edits, renames, formatting	Sonnet	`/effort low`
Standard coding, tests, refactoring	Sonnet	`/effort medium`
Complex debugging, architecture	Opus	`/effort high`
Quick questions	Haiku (via `/btw`)	N/A

CLAUDE.md Optimization

Keep the main CLAUDE.md under 200 lines – it loads on every message
Move detailed instructions into skills – they only load when invoked
Use @file imports for large reference docs instead of pasting content
Put path-specific rules in .claude/rules/ – they only load when Claude touches matching files

MCP and Tool Optimization

Disable unused MCP servers with /mcp – each server adds tool definitions to context
Use CLI tools (gh, aws, gcloud) instead of MCP when a single command works
Set ENABLE_TOOL_SEARCH=auto:5 to auto-defer tool definitions when they exceed 5% of context

CI/CD Budget Controls

# Hard spending limit
claude -p "fix failing tests" --max-budget-usd 2.00

# Limit agentic turns
claude -p "review this file" --max-turns 3

# Use cheapest model for simple CI tasks
claude -p "check for linting errors" --model haiku

Diagnostics – /doctor and /insights

Three tools for understanding what Claude Code is doing under the hood:

–debug – Verbose Logging

When you need to see exactly what Claude Code is doing (API calls, tool invocations, timing), use --debug:

# Full debug output to stderr
claude --debug

# Filter to specific categories
claude --debug "api,hooks"

# Write debug logs to a file (keeps terminal clean)
claude --debug-file /tmp/claude-debug.log

This is especially useful when MCP servers are not connecting, hooks are not firing, or API calls are failing silently.

/doctor – Health Check

Run /doctor when something is not working right. It checks:

Claude Code version and auto-updater status
Authentication state and token validity
API connectivity
Settings file syntax and conflicts
MCP server health
Permission configuration

/insights – Session Analysis

Run /insights after a long session to get an analysis report covering:

Token usage breakdown by category
Most expensive operations in the session
Patterns in how you use Claude Code
Suggestions for improving efficiency
Time spent waiting vs. actively working

Use this to identify habits that waste tokens and adjust your workflow.

IDE Integrations

Claude Code integrates with VS Code and JetBrains IDEs for inline diffs, context sharing, and side-by-side conversations.

VS Code

Install the “Claude Code” extension from the VS Code marketplace
Open Command Palette (Cmd+Shift+P on Mac / Ctrl+Shift+P on Linux/Windows) and search “Claude Code”
Works with Cursor editor too

JetBrains (IntelliJ, PyCharm, WebStorm, etc.)

Install “Claude Code” from the JetBrains Marketplace
Works across all JetBrains IDEs
Supports interactive diffs and context sharing

Start Claude with IDE auto-detection:

claude --ide

Quick Reference Card

The 20 commands and shortcuts you will use every day:

Action	How
Start new session	`claude`
Continue last session	`claude -c`
Initialize project	`/init`
Switch to plan mode	`Shift+Tab`
Switch model	`/model opus` or `Option+P` / `Alt+P`
Undo changes	`Esc + Esc`
Free context space	`/compact`
Start fresh	`/clear`
Check costs	`/cost`
Review changes	`/diff`
Security scan	`/security-review`
Name session	`/rename my-feature`
Resume session	`/resume` or `claude -r`
Mention a file	`@path/to/file`
Run bash directly	`!ls -la`
Multiline input	`\ + Enter`
Cancel generation	`Ctrl+C`
Exit	`Ctrl+D`
Non-interactive	`claude -p "query"`
Show all commands	`/help`

Auto Mode

Auto mode uses an AI classifier to decide whether each tool call needs your approval. Instead of prompting on every command, it allows safe operations (reads, git status, test runs) and blocks risky ones (force push, rm -rf, production deploys) automatically. Enable it with --permission-mode auto or press Shift+Tab to cycle to it.

Inspect the classifier rules with the claude auto-mode subcommand:

# View current auto-mode config
claude auto-mode config

# View default allow/deny rules
claude auto-mode defaults

# Get AI feedback on your custom rules
claude auto-mode critique

Customize rules in .claude/settings.json or ~/.claude/settings.json under the autoMode key with allow, soft_deny, and environment arrays. The classifier reads these plus the defaults to make per-tool-call decisions.

/loop – Recurring Tasks

The /loop slash command runs a prompt or another slash command on a repeating interval within your session. Useful for polling deploy status, watching test results, or checking a service health endpoint.

# Check deploy status every 5 minutes
/loop 5m check if the deploy on staging is complete

# Run tests every 10 minutes (default interval)
/loop /test

# Custom interval with a slash command
/loop 2m /security-review

The loop runs in the background until you stop it or end the session. Each iteration gets its own context, so long-running loops do not bloat the conversation.

Subcommands Reference

Claude Code provides subcommands for management tasks outside of interactive sessions:

Subcommand	What It Does
`claude agents`	List configured agents and their descriptions
`claude auth`	Manage authentication (login, logout, token info)
`claude auto-mode config`	Print effective auto-mode classifier rules
`claude auto-mode defaults`	Show default allow/deny rules
`claude auto-mode critique`	Get AI feedback on your custom auto-mode rules
`claude doctor`	Health check for auto-updater, auth, MCP, settings
`claude install [target]`	Install specific version (stable, latest, or version number)
`claude mcp`	Configure and manage MCP servers from the CLI
`claude plugins`	Manage Claude Code plugins
`claude setup-token`	Set up a long-lived auth token (requires subscription)
`claude update`	Check for and install updates

Claude Code for DevOps – Full Guide Series

This cheat sheet covers the commands and configuration. The DevOps series goes deeper with real-world demos, tested on actual infrastructure:

Set Up Claude Code for DevOps Engineers – CLAUDE.md rules, permission lockdowns, hooks, and safety configuration for production use
Manage Servers with Claude Code via SSH – multi-server health checks, log analysis, config audits, and incident response over SSH
Build and Debug Docker Containers with Claude Code – Dockerfile generation, multi-stage builds, Compose workflows, and container debugging
Deploy Infrastructure with Claude Code and Terraform – HCL generation, plan review, state management, and module refactoring
Generate and Debug Ansible Playbooks with Claude Code – playbook generation, role scaffolding, multi-OS support, and Vault integration
Deploy and Debug Kubernetes Apps with Claude Code – manifest generation, pod debugging, Helm chart management, and cluster troubleshooting
Set Up Claude Code in GitHub Actions for Infrastructure Review – automated PR reviews, Terraform plan analysis, and CI/CD integration

Conclusion

Claude Code replaces a large part of the manual terminal workflow for developers and sysadmins. The key to getting the most out of it: set up CLAUDE.md for every project, use plan mode before making changes, keep context clean with /compact and /clear, and use print mode (-p) to integrate it into your existing scripts and CI/CD pipelines. If you need multi-provider support, check out OpenCode (75+ providers) or Aider (git-native AI pair programming). For the latest features and documentation, visit the official Claude Code docs.