┌─────────────────────────────────────────────────────────┐
│                    CLAUDE CODE LAYERS                    │
├─────────────────────────────────────────────────────────┤
│  EXTENSION LAYER                                         │
│  ┌─────────┐  ┌─────────┐  ┌─────────┐  ┌─────────┐    │
│  │   MCP   │  │  Hooks  │  │ Skills  │  │ Plugins │    │
│  └─────────┘  └─────────┘  └─────────┘  └─────────┘    │
│  External tools, deterministic automation, domain       │
│  expertise, packaged extensions                          │
├─────────────────────────────────────────────────────────┤
│  DELEGATION LAYER                                        │
│  ┌─────────────────────────────────────────────────┐    │
│  │              Subagents (up to 10 parallel)       │    │
│  │   Explore | Plan | General-purpose | Custom      │    │
│  └─────────────────────────────────────────────────┘    │
│  Isolated contexts for focused work, returns summaries  │
├─────────────────────────────────────────────────────────┤
│  CORE LAYER                                              │
│  ┌─────────────────────────────────────────────────┐    │
│  │         Main Conversation Context                │    │
│  │   Tools: Read, Edit, Bash, Glob, Grep, etc.     │    │
│  └─────────────────────────────────────────────────┘    │
│  Your primary interaction; limited context; costs money │
└─────────────────────────────────────────────────────────┘

apk add libgcc libstdc++ ripgrep
export USE_BUILTIN_RIPGREP=0

# macOS and Linux
curl -fsSL https://claude.ai/install.sh | bash

# Homebrew alternative
brew install --cask claude-code

# Windows PowerShell
irm https://claude.ai/install.ps1 | iex

# Windows CMD
curl -fsSL https://claude.ai/install.cmd -o install.cmd && install.cmd && del install.cmd

# Install specific version
curl -fsSL https://claude.ai/install.sh | bash -s 1.0.58

# Install latest explicitly
curl -fsSL https://claude.ai/install.sh | bash -s latest

# Windows PowerShell - specific version
& ([scriptblock]::Create((irm https://claude.ai/install.ps1))) 1.0.58

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

claude install

# AWS Bedrock
export CLAUDE_CODE_USE_BEDROCK=1
export AWS_REGION=us-east-1
export AWS_PROFILE=your-profile

# Google Vertex AI
export CLAUDE_CODE_USE_VERTEX=1
export CLOUD_ML_REGION=us-east5
export ANTHROPIC_VERTEX_PROJECT_ID=your-project

# Microsoft Foundry
export CLAUDE_CODE_USE_FOUNDRY=1
export ANTHROPIC_FOUNDRY_RESOURCE=your-resource-name
# Optional: API key auth (otherwise uses Entra ID)
export ANTHROPIC_FOUNDRY_API_KEY=your-key

# Corporate proxy
export HTTPS_PROXY='https://proxy.example.com:8080'

# LLM gateway (skip native auth)
export CLAUDE_CODE_USE_BEDROCK=1
export ANTHROPIC_BEDROCK_BASE_URL='https://your-gateway.com/bedrock'
export CLAUDE_CODE_SKIP_BEDROCK_AUTH=1

claude doctor

claude auth login          # Log in or switch accounts
claude auth status         # Check current auth state (account, plan, expiry)
claude auth logout         # Clear stored credentials

claude auth logout && claude auth login

export DISABLE_AUTOUPDATER=1

{
  "env": {
    "DISABLE_AUTOUPDATER": "1"
  }
}

claude update

rm -f ~/.local/bin/claude
rm -rf ~/.claude-code

Remove-Item -Path "$env:LOCALAPPDATA\Programs\claude-code" -Recurse -Force
Remove-Item -Path "$env:LOCALAPPDATA\Microsoft\WindowsApps\claude.exe" -Force

rm -rf ~/.claude
rm ~/.claude.json
rm -rf .claude
rm -f .mcp.json

claude                           # Launch in current directory

cd ~/my-project && claude        # Or launch from any git repo

> "Explain the architecture of this project"
> "Find all TODO comments and create a summary"
> "Add input validation to the signup form"

/cost                            # Check token usage and cost
/compact                         # Free up context when it gets large
Alt+T                            # Toggle extended thinking for hard problems
Ctrl+C                           # Cancel current response

claude -c                        # Resume your most recent session
claude --resume                  # Pick from session list

cd your-project
claude

claude "explain the authentication flow in this project"

# Direct query
claude -p "list all TODO comments in this project"

# Process piped input
cat error.log | claude -p "identify the root cause of these failures"

# Chain with other tools
claude -p "generate a README" > README.md

claude -p "count lines by file type" --output-format json

{
  "type": "result",
  "subtype": "success",
  "total_cost_usd": 0.0034,
  "is_error": false,
  "duration_ms": 2847,
  "duration_api_ms": 1923,
  "num_turns": 4,
  "result": "Response text here...",
  "session_id": "abc-123-def"
}

claude -p "build the application" --output-format stream-json | while read line; do
  echo "$line" | jq -r 'select(.result) | .result'
done

# Limit autonomous turns (prevents runaway loops)
claude -p "refactor the auth module" --max-turns 10

# Allow specific tools without prompting
claude -p "fix lint errors" --allowedTools "Edit,Bash(npm run lint)"

# Use with a specific model
claude -p "explain this code" --model claude-sonnet-4-5-20250929

# In a GitHub Action or CI pipeline
result=$(claude -p "review this diff for security issues" --output-format json 2>/dev/null)
is_error=$(echo "$result" | jq -r '.is_error')
if [ "$is_error" = "true" ]; then
  echo "Review failed"
  exit 1
fi
echo "$result" | jq -r '.result'

# Continue most recent session
claude -c

# Continue with additional prompt
claude -c -p "now add error handling"

# Resume specific session by ID
claude -r "abc123" "implement the remaining tests"

# Fork a session for parallel exploration
claude -r "base-session" --fork-session "try a different approach"

claude --from-pr 123                                    # By PR number
claude --from-pr https://github.com/org/repo/pull/123   # By URL

# Name current session
> /rename auth-refactor

# Resume by name or number
> /resume 1                    # Resume first session
> /resume auth-refactor        # Resume by name
claude --resume auth-refactor  # Resume from terminal
claude -r 3                    # Resume by number from terminal

# Fork for parallel exploration
claude --resume auth-refactor --fork-session

# Cycle through modes during a session
Shift+Tab           # Cycles: normal → plan → auto-accept

# Or ask Claude directly
"Plan how to refactor the auth module"   # Claude may enter plan mode automatically

{
  "$schema": "https://json.schemastore.org/claude-code-settings.json",
  "model": "claude-sonnet-4-5-20250929",
  "permissions": {
    "allow": [
      "Read",
      "Glob",
      "Grep",
      "Bash(npm run:*)",
      "Bash(git:*)",
      "Bash(make:*)",
      "Edit(src/**)",
      "Write(src/**)",
      "mcp__github"
    ],
    "deny": [
      "Read(.env*)",
      "Read(secrets/**)",
      "Bash(rm -rf:*)",
      "Bash(sudo:*)",
      "Edit(package-lock.json)",
      "Edit(.git/**)"
    ],
    "ask": [
      "WebFetch",
      "Bash(curl:*)",
      "Bash(docker:*)"
    ],
    "additionalDirectories": [
      "../shared-lib",
      "../docs"
    ],
    "defaultMode": "acceptEdits"
  },
  "env": {
    "NODE_ENV": "development",
    "DEBUG": "app:*"
  },
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "npx prettier --write \"$FILE_PATH\""
          }
        ]
      }
    ]
  },
  "sandbox": {
    "enabled": false,
    "autoAllowBashIfSandboxed": true,
    "excludedCommands": ["git", "docker"]
  },
  "statusLine": {
    "type": "command",
    "command": "~/.claude/statusline.sh"
  },
  "includeCoAuthoredBy": true,
  "cleanupPeriodDays": 30,
  "outputStyle": "Explanatory",
  "language": "en",
  "respectGitignore": true,
  "showTurnDuration": true,
  "plansDirectory": ".claude/plans",
  "spinnerVerbs": ["Thinking", "Processing", "Analyzing"],
  "spinnerTipsOverride": {
    "tips": ["Custom tip 1", "Custom tip 2"],
    "excludeDefault": true
  }
}

ANTHROPIC_API_KEY=sk-ant-...                    # Direct API authentication
ANTHROPIC_AUTH_TOKEN=token                      # Custom authorization header
ANTHROPIC_CUSTOM_HEADERS="X-Key: val"           # Additional request headers

ANTHROPIC_MODEL=claude-opus-4-6                 # Override default model
ANTHROPIC_DEFAULT_OPUS_MODEL=claude-opus-4-6    # Opus 4.6 (Feb 2026)
ANTHROPIC_DEFAULT_SONNET_MODEL=claude-sonnet-4-5-20250929
ANTHROPIC_DEFAULT_HAIKU_MODEL=claude-haiku-4-5-20251001
CLAUDE_CODE_SUBAGENT_MODEL=sonnet               # Model for subagents
MAX_THINKING_TOKENS=10000                       # Enable extended thinking
CLAUDE_CODE_MAX_OUTPUT_TOKENS=4000              # Limit output length
CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS=1          # Enable agent teams (v2.1.32+)

CLAUDE_CODE_USE_BEDROCK=1                       # Use AWS Bedrock
CLAUDE_CODE_USE_VERTEX=1                        # Use Google Vertex AI
CLAUDE_CODE_USE_FOUNDRY=1                       # Use Microsoft Foundry
ANTHROPIC_BEDROCK_BASE_URL=https://...          # Custom Bedrock endpoint
CLAUDE_CODE_SKIP_BEDROCK_AUTH=1                 # Skip Bedrock auth (for gateways)
CLAUDE_CODE_SKIP_VERTEX_AUTH=1                  # Skip Vertex auth
AWS_BEARER_TOKEN_BEDROCK=token                  # Bedrock bearer token
VERTEX_REGION_CLAUDE_3_7_SONNET=us-west1        # Override Vertex region

DISABLE_AUTOUPDATER=1                           # Prevent automatic updates
DISABLE_TELEMETRY=1                             # Opt out of usage telemetry
DISABLE_ERROR_REPORTING=1                       # Disable Sentry
DISABLE_BUG_COMMAND=1                           # Disable /bug command
DISABLE_COST_WARNINGS=1                         # Hide cost warnings
DISABLE_PROMPT_CACHING=1                        # Disable prompt caching globally
DISABLE_PROMPT_CACHING_SONNET=1                 # Disable for Sonnet only
DISABLE_PROMPT_CACHING_OPUS=1                   # Disable for Opus only
DISABLE_NON_ESSENTIAL_MODEL_CALLS=1             # Skip non-critical API calls

BASH_DEFAULT_TIMEOUT_MS=30000                   # Bash command timeout (30s)
BASH_MAX_TIMEOUT_MS=600000                      # Maximum bash timeout (10min)
BASH_MAX_OUTPUT_LENGTH=50000                    # Bash output limit
CLAUDE_BASH_MAINTAIN_PROJECT_WORKING_DIR=1     # Reset CWD after each bash
MCP_TIMEOUT=5000                                # MCP server startup timeout
MCP_TOOL_TIMEOUT=30000                          # MCP tool execution timeout
MAX_MCP_OUTPUT_TOKENS=25000                     # MCP output limit
SLASH_COMMAND_TOOL_CHAR_BUDGET=15000            # Slash command context limit

HTTP_PROXY=http://proxy:8080                    # HTTP proxy
HTTPS_PROXY=https://proxy:8080                  # HTTPS proxy
NO_PROXY=localhost,example.com                  # Bypass proxy for domains
CLAUDE_CODE_CLIENT_CERT=/path/to/cert           # mTLS certificate
CLAUDE_CODE_CLIENT_KEY=/path/to/key             # mTLS private key
CLAUDE_CODE_CLIENT_KEY_PASSPHRASE=pass          # mTLS passphrase

CLAUDE_CODE_DISABLE_TERMINAL_TITLE=1            # Don't update terminal title
CLAUDE_CODE_IDE_SKIP_AUTO_INSTALL=1             # Skip IDE extension install
CLAUDE_CODE_SHELL=/bin/zsh                      # Override shell detection
USE_BUILTIN_RIPGREP=1                           # Use included ripgrep (default)
CLAUDE_CONFIG_DIR=~/.myconfig                   # Custom config directory
IS_DEMO=1                                       # Hide sensitive UI elements[^37]
CLAUDE_CODE_DISABLE_BACKGROUND_TASKS=1          # Disable background tasks and Ctrl+B[^46]
CLAUDE_CODE_TMPDIR=/path/to/tmp                 # Override temp directory[^50]
CLAUDE_CODE_DISABLE_1M_CONTEXT=1               # Disable 1M context window (use standard 200K)[^103]
CLAUDE_CODE_PLUGIN_GIT_TIMEOUT_MS=120000       # Plugin marketplace git timeout (default 120s, was 30s)[^105]

CLAUDE_CODE_ACCOUNT_UUID=uuid                  # Provide account UUID synchronously for SDK callers
CLAUDE_CODE_USER_EMAIL=[email protected]        # Provide user email for SDK callers
CLAUDE_CODE_ORGANIZATION_UUID=uuid             # Provide organization UUID for SDK callers

ANTHROPIC_LOG=debug                             # Enable API request logging

> /model opus
> /model sonnet
> /model haiku

claude --model opus

export ANTHROPIC_MODEL=opus

{
  "model": "claude-sonnet-4-5-20250929"
}

export CLAUDE_CODE_SUBAGENT_MODEL=haiku

claude --model sonnet[1m]
claude --model opus[1m]           # Opus 4.6 with 1M context (beta)

> /model sonnet[1m]
> /model opus[1m]

> /status

> /fast            # Toggle fast mode on/off

> /cost

Total cost:            $0.55
Total duration (API):  6m 19.7s
Total duration (wall): 6h 33m 10.2s
Total code changes:    247 lines added, 89 lines removed

curl "https://api.anthropic.com/v1/organizations/usage_report/claude_code?starting_at=2026-01-15" \
  -H "x-api-key: sk-ant-admin..." \
  -H "anthropic-version: 2023-06-01"

# Connect to remote MCP server with OAuth
claude mcp add --transport http linear https://mcp.linear.app/sse
# Browser opens for OAuth flow, tokens stored securely

{
  "mcpToolSearchAutoEnable": "auto:15"  // Enable when tools exceed 15% of context
}

claude mcp add --transport http github https://api.githubcopilot.com/mcp/

# With authentication
claude mcp add --transport http api https://api.example.com/mcp \
  --header "Authorization: Bearer $API_TOKEN"

claude mcp add --transport sse asana https://mcp.asana.com/sse \
  --header "X-API-Key: your-key"

# PostgreSQL
claude mcp add --transport stdio postgres \
  --env "DATABASE_URL=postgresql://user:pass@localhost/db" \
  -- npx -y @anthropic-ai/mcp-server-postgres

# Custom server
claude mcp add --transport stdio custom -- python /path/to/server.py --port 8000

claude mcp add --transport stdio my-server -- cmd /c npx -y @some/package

claude mcp add --scope project --transport http github https://...
claude mcp add --scope user --transport stdio personal-tool -- ./my-tool

{
  "mcpServers": {
    "github": {
      "type": "http",
      "url": "https://api.githubcopilot.com/mcp/"
    },
    "database": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@anthropic-ai/mcp-server-postgres"],
      "env": {
        "DATABASE_URL": "${DATABASE_URL}"
      }
    },
    "sentry": {
      "type": "http",
      "url": "https://mcp.sentry.dev/mcp",
      "headers": {
        "Authorization": "Bearer ${SENTRY_API_KEY}"
      }
    },
    "internal-api": {
      "type": "http",
      "url": "${API_BASE_URL:-https://api.example.com}/mcp",
      "headers": {
        "X-API-Key": "${INTERNAL_API_KEY}"
      }
    }
  }
}

claude mcp list                      # View all configured servers
claude mcp get github                # Get specific server details
claude mcp remove github             # Remove a server
claude mcp reset-project-choices     # Reset project-scoped approvals
claude mcp add-from-claude-desktop   # Import from Claude Desktop
claude mcp add-json weather '{"type":"http","url":"..."}'  # Add from JSON

# Within Claude Code REPL
> /mcp                               # Interactive MCP management

> /mcp
# Follow browser-based OAuth flow
# Tokens stored securely and auto-refreshed
# Use "Clear authentication" to revoke access

@github:issue://123
@postgres:schema://users
@docs:file://api/authentication

/mcp__github__list_prs
/mcp__github__pr_review 456
/mcp__jira__create_issue "Bug title" high

export MAX_MCP_OUTPUT_TOKENS=50000

> Review PR #456
> List all open issues assigned to me
> Create a bug issue for the authentication failure we found

> What's our total revenue this quarter?
> Show the schema for the users table
> Find customers with no purchases in 90 days

> What errors occurred in production today?
> Show the stack trace for error ABC123
> Which deployment introduced these errors?

{
  "allowedMcpServers": [
    { "serverName": "github" },
    { "serverName": "sentry" },
    { "serverCommand": ["npx", "-y", "@approved/server"] }
  ],
  "deniedMcpServers": [
    { "serverName": "dangerous-server" }
  ]
}

> Use the explore agent to find all authentication-related files

> Have a subagent analyze the database schema thoroughly

> Spawn an agent to research how error handling works in this codebase

---
name: security-reviewer
description: Expert security code reviewer. Use PROACTIVELY after any code changes to authentication, authorization, or data handling.
tools: Read, Grep, Glob, Bash
model: opus
permissionMode: plan
---

You are a senior security engineer reviewing code for vulnerabilities.

When invoked:
1. Identify the files that were recently changed
2. Analyze for OWASP Top 10 vulnerabilities
3. Check for secrets, hardcoded credentials, SQL injection
4. Report findings with severity levels and remediation steps

Focus on actionable security findings, not style issues.

claude --agents '{
  "code-reviewer": {
    "description": "Expert code reviewer. Use proactively after code changes.",
    "prompt": "You are a senior code reviewer. Focus on code quality and security.",
    "tools": ["Read", "Grep", "Glob", "Bash"],
    "model": "sonnet"
  }
}'

> /agents                    # 대화형 관리
> /agents create             # 새 subagent 생성
> /agents edit               # 기존 수정
> /agents delete             # subagent 삭제
> /agents list               # 전체 보기

> Run a thorough security review in the background

> /agents  # Check status of running agents

> First use the code-analyzer subagent to find performance issues, then use the optimizer subagent to fix them

> Have three explore agents search in parallel:
> 1. Authentication code
> 2. Database models
> 3. API routes

> Resume agent abc123 and continue the analysis

> Run security review in the background while I continue frontend work
> /tasks                    # Check status of running agents

// settings.json
{
  "env": {
    "CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS": "1"
  }
}

Create an agent team to review PR #142. Spawn three reviewers:
- One focused on security implications
- One checking performance impact
- One validating test coverage

Spawn a team with 4 teammates to refactor these modules in parallel.
Use Sonnet for each teammate.

.claude/skills/
├── security-review/
│   ├── skill.md           # Instructions and prompts
│   ├── checklist.md       # Security checklist
│   └── common-vulns.sh    # Detection scripts
└── performance-audit/
    ├── skill.md
    └── profiling-guide.md

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "npx prettier --write \"$FILE_PATH\""
          }
        ]
      }
    ],
    "PreToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": ".claude/hooks/validate-bash.sh"
          }
        ]
      }
    ],
    "UserPromptSubmit": [
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": ".claude/hooks/inject-context.sh"
          }
        ]
      }
    ]
  }
}

{"matcher": "*"}              // Match all tools
{"matcher": "Bash"}           // Match Bash only
{"matcher": "Edit|Write"}     // Match Edit or Write
{"matcher": "mcp__github"}    // Match MCP server tools
{"matcher": ""}               // Match for events without tools (like UserPromptSubmit)

{
  "tool_name": "Bash",
  "tool_input": {
    "command": "npm test",
    "description": "Run test suite"
  },
  "session_id": "abc-123"
}

{
  "session_id": "abc-123",
  "last_assistant_message": "I've completed the refactoring. Here's what changed..."
}

{
  "decision": "allow",
  "message": "Command validated and modified",
  "modifications": {
    "tool_input": {
      "command": "npm test -- --coverage"
    }
  }
}

{
  "hookSpecificOutput": {
    "hookEventName": "PreToolUse",
    "permissionDecision": "allow",
    "permissionDecisionReason": "Command validated and modified",
    "updatedInput": {
      "command": "npm test -- --coverage --ci"
    },
    "additionalContext": "Note: This database has a 5-second query timeout."
  }
}

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": ".claude/hooks/notify-slack.sh",
            "async": true
          }
        ]
      }
    ]
  }
}

{
  "hooks": {
    "Stop": [
      {
        "hooks": [
          {
            "type": "prompt",
            "prompt": "Evaluate if Claude should stop: $ARGUMENTS. Check if all requested tasks are complete and tests pass.",
            "timeout": 30
          }
        ]
      }
    ]
  }
}

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "http",
            "url": "https://api.example.com/notify",
            "headers": {
              "Authorization": "Bearer $MY_TOKEN"
            },
            "allowedEnvVars": ["MY_TOKEN"]
          }
        ]
      }
    ]
  }
}

{
  "hooks": {
    "Stop": [
      {
        "hooks": [
          {
            "type": "agent",
            "prompt": "Verify all unit tests pass. Run the test suite and check results. $ARGUMENTS",
            "timeout": 120
          }
        ]
      }
    ]
  }
}

#!/bin/bash
if [ -n "$CLAUDE_ENV_FILE" ]; then
  echo 'export NODE_ENV=production' >> "$CLAUDE_ENV_FILE"
fi
exit 0

{
  "hooks": {
    "PostToolUse": [{
      "hooks": [{
        "type": "command",
        "command": "curl -H 'Authorization: Bearer $MY_TOKEN' https://api.example.com/notify",
        "allowedEnvVars": ["MY_TOKEN"]
      }]
    }]
  }
}

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "bash -c '[[ \"$FILE_PATH\" == *.ts ]] && npx prettier --write \"$FILE_PATH\" || true'"
          }
        ]
      }
    ]
  }
}

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Bash",
        "hooks": [
          {
            "type": "command",
            "command": "jq -r '.tool_input.command' >> ~/.claude/bash-history.log"
          }
        ]
      }
    ]
  }
}

#!/bin/bash
# .claude/hooks/protect-files.sh
data=$(cat)
path=$(echo "$data" | jq -r '.tool_input.file_path // empty')

if [[ "$path" == *".env"* ]] || [[ "$path" == *"secrets/"* ]] || [[ "$path" == *".pem"* ]]; then
  echo "Blocked: Cannot access sensitive file $path" >&2
  exit 2  # Exit 2 = block the tool call. Exit 1 = non-blocking error (hook failure only).
fi
exit 0

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit",
        "hooks": [
          {
            "type": "command",
            "command": "bash -c '[[ \"$FILE_PATH\" == *.test.ts ]] || npm run test:affected'"
          }
        ]
      }
    ]
  }
}

{
  "hooks": {
    "Notification": [
      {
        "matcher": "",
        "hooks": [
          {
            "type": "command",
            "command": "notify-send 'Claude Code' 'Waiting for your input'"
          }
        ]
      }
    ]
  }
}

#!/bin/bash
# .claude/hooks/inject-context.sh
# Add current git branch and recent commits to every prompt

branch=$(git branch --show-current 2>/dev/null)
commits=$(git log --oneline -3 2>/dev/null | tr '\n' ' ')

if [ -n "$branch" ]; then
  echo "[Context: Branch '$branch', Recent: $commits]"
fi
exit 0

claude --debug

---
name: secure-deployment
description: Deployment skill with security validation
hooks:
  PreToolUse:
    - matcher: Bash
      command: ".claude/hooks/validate-deploy.sh"
  PostToolUse:
    - matcher: Bash
      command: ".claude/hooks/log-deploy.sh"
  Stop:
    - command: ".claude/hooks/cleanup.sh"
      once: true  # Run only once per session
---

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Edit",
        "hooks": [
          {
            "type": "command",
            "command": "npm run lint && npm run typecheck",
            "timeout": 60000
          }
        ]
      }
    ],
    "Stop": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "npm test || echo 'Tests failing - Claude should fix before stopping'"
          }
        ]
      }
    ]
  }
}

# Connect to remote MCP server with OAuth
claude mcp add --transport http linear https://mcp.linear.app/sse
# Browser opens for OAuth flow, tokens stored securely

{
  "mcpToolSearchAutoEnable": "auto:15"  // Enable when tools exceed 15% of context
}

claude mcp add --transport http github https://api.githubcopilot.com/mcp/

# With authentication
claude mcp add --transport http api https://api.example.com/mcp \
  --header "Authorization: Bearer $API_TOKEN"

claude mcp add --transport sse asana https://mcp.asana.com/sse \
  --header "X-API-Key: your-key"

# PostgreSQL
claude mcp add --transport stdio postgres \
  --env "DATABASE_URL=postgresql://user:pass@localhost/db" \
  -- npx -y @anthropic-ai/mcp-server-postgres

# Custom server
claude mcp add --transport stdio custom -- python /path/to/server.py --port 8000

claude mcp add --transport stdio my-server -- cmd /c npx -y @some/package

claude mcp add --scope project --transport http github https://...
claude mcp add --scope user --transport stdio personal-tool -- ./my-tool

{
  "mcpServers": {
    "github": {
      "type": "http",
      "url": "https://api.githubcopilot.com/mcp/"
    },
    "database": {
      "type": "stdio",
      "command": "npx",
      "args": ["-y", "@anthropic-ai/mcp-server-postgres"],
      "env": {
        "DATABASE_URL": "${DATABASE_URL}"
      }
    },
    "sentry": {
      "type": "http",
      "url": "https://mcp.sentry.dev/mcp",
      "headers": {
        "Authorization": "Bearer ${SENTRY_API_KEY}"
      }
    },
    "internal-api": {
      "type": "http",
      "url": "${API_BASE_URL:-https://api.example.com}/mcp",
      "headers": {
        "X-API-Key": "${INTERNAL_API_KEY}"
      }
    }
  }
}

claude mcp list                      # View all configured servers
claude mcp get github                # Get specific server details
claude mcp remove github             # Remove a server
claude mcp reset-project-choices     # Reset project-scoped approvals
claude mcp add-from-claude-desktop   # Import from Claude Desktop
claude mcp add-json weather '{"type":"http","url":"..."}'  # Add from JSON

# Within Claude Code REPL
> /mcp                               # Interactive MCP management

> /mcp
# Follow browser-based OAuth flow
# Tokens stored securely and auto-refreshed
# Use "Clear authentication" to revoke access

@github:issue://123
@postgres:schema://users
@docs:file://api/authentication

/mcp__github__list_prs
/mcp__github__pr_review 456
/mcp__jira__create_issue "Bug title" high

export MAX_MCP_OUTPUT_TOKENS=50000

> Review PR #456
> List all open issues assigned to me
> Create a bug issue for the authentication failure we found

> What's our total revenue this quarter?
> Show the schema for the users table
> Find customers with no purchases in 90 days

> What errors occurred in production today?
> Show the stack trace for error ABC123
> Which deployment introduced these errors?

{
  "allowedMcpServers": [
    { "serverName": "github" },
    { "serverName": "sentry" },
    { "serverCommand": ["npx", "-y", "@approved/server"] }
  ],
  "deniedMcpServers": [
    { "serverName": "dangerous-server" }
  ]
}

> Use the explore agent to find all authentication-related files

> Have a subagent analyze the database schema thoroughly

> Spawn an agent to research how error handling works in this codebase

---
name: security-reviewer
description: Expert security code reviewer. Use PROACTIVELY after any code changes to authentication, authorization, or data handling.
tools: Read, Grep, Glob, Bash
model: opus
permissionMode: plan
---

You are a senior security engineer reviewing code for vulnerabilities.

When invoked:
1. Identify the files that were recently changed
2. Analyze for OWASP Top 10 vulnerabilities
3. Check for secrets, hardcoded credentials, SQL injection
4. Report findings with severity levels and remediation steps

Focus on actionable security findings, not style issues.

claude --agents '{
  "code-reviewer": {
    "description": "Expert code reviewer. Use proactively after code changes.",
    "prompt": "You are a senior code reviewer. Focus on code quality and security.",
    "tools": ["Read", "Grep", "Glob", "Bash"],
    "model": "sonnet"
  }
}'

> /agents                    # 대화형 관리
> /agents create             # 새 subagent 생성
> /agents edit               # 기존 항목 수정
> /agents delete             # subagent 삭제
> /agents list               # 전체 보기

claude agents                # Shows agents grouped by source (built-in, user, project, plugin)

claude remote-control        # Start serving local environment for external builds

> Run a thorough security review in the background

> /agents  # Check status of running agents

> First use the code-analyzer subagent to find performance issues, then use the optimizer subagent to fix them

> Have three explore agents search in parallel:
> 1. Authentication code
> 2. Database models
> 3. API routes

> Resume agent abc123 and continue the analysis

> Run security review in the background while I continue frontend work
> /tasks                    # Check status of running agents

// settings.json
{
  "env": {
    "CLAUDE_CODE_EXPERIMENTAL_AGENT_TEAMS": "1"
  }
}

Spawn an architect teammate to refactor the authentication module.
Require plan approval before they make any changes.

Create an agent team to review PR #142. Spawn three reviewers:
- One focused on security implications
- One checking performance impact
- One validating test coverage

Spawn a team with 4 teammates to refactor these modules in parallel.
Use Sonnet for each teammate.

.claude/skills/
├── security-review/
│   ├── skill.md           # Instructions and prompts
│   ├── checklist.md       # Security checklist
│   └── common-vulns.sh    # Detection scripts
└── performance-audit/
    ├── skill.md
    └── profiling-guide.md

Press Alt+T to toggle thinking on/off

# Set custom budget (default is 31,999)
export MAX_THINKING_TOKENS=8000
claude

# Double the default for complex tasks
export MAX_THINKING_TOKENS=63999
claude

export MAX_THINKING_TOKENS=8000  # Reduce from default 31,999

> /output-style Explanatory
> /output-style Learning

{
  "outputStyle": "Explanatory"
}

# my-style

## Instructions
- Always explain the WHY behind each decision
- Include relevant documentation links
- Format code examples with comments
- End with a "What to do next" section

## Format
Use markdown headers for organization.
Keep explanations under 200 words per section.

---
description: Security-focused code review
allowed-tools: Read, Grep, Glob
model: claude-sonnet-4-5
---

Review this code for security vulnerabilities:

1. Injection attacks (SQL, command, XSS)
2. Authentication and authorization flaws
3. Sensitive data exposure
4. Insecure dependencies

Focus on actionable findings with specific line references.

---
description: Brief description for /help
allowed-tools: Read, Edit, Bash(npm:*)
model: opus
argument-hint: [arg1] [arg2]
disable-model-invocation: false
---

---
description: Fix GitHub issue
argument-hint: [issue-number]
---

Fix GitHub issue #$ARGUMENTS following our coding standards.

---
description: Create component
argument-hint: [name] [type]
---

Create a new $2 component named $1 in src/components/.

---
description: Git status summary
allowed-tools: Bash(git:*)
---

Current branch: !`git branch --show-current`
Recent commits: !`git log --oneline -5`
Changed files: !`git status --short`

Summarize the current state of this repository.

---
description: Compare implementations
---

Compare these files:
@src/v1/handler.ts
@src/v2/handler.ts

Which implementation is more maintainable?

.claude/commands/
├── backend/
│   ├── test.md
│   └── deploy.md
├── frontend/
│   ├── test.md
│   └── build.md
└── review.md

~/.claude/skills/
├── code-reviewer/
│   ├── SKILL.md
│   ├── SECURITY_PATTERNS.md
│   └── PERFORMANCE_CHECKLIST.md
├── sql-analyst/
│   ├── SKILL.md
│   └── QUERY_PATTERNS.md
└── api-designer/
    └── SKILL.md

.claude/skills/
├── domain-expert/
│   ├── SKILL.md
│   ├── BUSINESS_RULES.md
│   └── DATA_MODELS.md
└── deployment/
    ├── SKILL.md
    └── RUNBOOKS.md

---
name: code-reviewer
description: Review code for security vulnerabilities, performance issues, and best practice violations. Use when examining code changes, reviewing PRs, analyzing code quality, or when asked to review or audit code.
allowed-tools: Read, Grep, Glob
---

# Code Review Expertise

## Security Analysis

When reviewing code, check for:

### Input Validation
- All user input sanitized before use
- Parameterized queries for database operations
- Output encoding for rendered content

### Authentication & Authorization
- Session tokens properly validated
- Permission checks before sensitive operations
- No hardcoded credentials or API keys

### Data Exposure
- Sensitive data not logged
- PII properly masked in error messages
- API responses don't leak internal details

## Performance Patterns

### Database
- N+1 query detection
- Missing indexes on filtered columns
- Unbounded result sets

### Memory
- Large object lifecycle management
- Stream processing for big files
- Connection pool exhaustion risks

## Review Output Format

For each finding:
- **File**: path/to/file.ts:123
- **Severity**: Critical | High | Medium | Low
- **Category**: Security | Performance | Maintainability
- **Issue**: Clear description of the problem
- **Recommendation**: Specific fix with code example
- **Rationale**: Why this matters

See [SECURITY_PATTERNS.md](SECURITY_PATTERNS.md) for detailed vulnerability patterns.
See [PERFORMANCE_CHECKLIST.md](PERFORMANCE_CHECKLIST.md) for optimization guidelines.

description: Helps with code

description: Review code for security vulnerabilities, performance issues, and best practice violations. Use when examining code changes, reviewing PRs, analyzing code quality, or when asked to review, audit, or check code.

---
name: security-auditor
description: Audit code for security vulnerabilities without making changes
allowed-tools: Read, Grep, Glob
---

my-skill/
├── SKILL.md           # Required: overview + quick reference
├── DETAILED_GUIDE.md  # Deep documentation
├── EXAMPLES.md        # Concrete examples
├── PATTERNS.md        # Reference patterns
├── templates/         # Reusable templates
│   └── component.tsx
└── scripts/           # Helper utilities
    └── validate.py

For detailed security patterns, see [SECURITY_PATTERNS.md](SECURITY_PATTERNS.md).

Use this template for new components:
@templates/component.tsx

Validate configurations with:
```bash
python scripts/validate.py config.json

**전문가 팁:** 필수 정보는 SKILL.md에 직접 넣으세요. 지원 파일은 심층 참조 자료용으로 남겨두세요. Claude는 SKILL.md를 즉시 읽지만 지원 파일은 필요할 때만 접근합니다. 중요한 정보가 지원 파일에 묻혀 있으면 Claude가 찾지 못할 수 있습니다.

### 완전한 예제: 도메인 전문가 Skill

핀테크 애플리케이션을 위한 프로덕션 품질의 skill입니다:

**디렉토리 구조:**

**SKILL.md:**
```markdown
---
name: payments-domain
description: Expert knowledge of payment processing domain including transaction flows, compliance requirements, and business rules. Use when working with payment code, transaction handling, refunds, disputes, or financial calculations.
---

# Payments Domain Expertise

## 핵심 개념

### 거래 상태

### 금액 처리 규칙
- 모든 금액 값은 정수로 저장합니다 (달러가 아닌 센트 단위)
- 통화는 항상 명시적으로 추적합니다 (USD를 가정하지 않음)
- 반올림: 계산 시 HALF_EVEN, 표시 시 HALF_UP
- 금액에는 절대로 부동소수점을 사용하지 않습니다

### 멱등성 요구사항
모든 결제 작업은 반드시 멱등성을 보장해야 합니다:
```typescript
// Required pattern
async function processPayment(idempotencyKey: string, amount: number) {
  const existing = await findByIdempotencyKey(idempotencyKey);
  if (existing) return existing; // Return cached result

  const result = await executePayment(amount);
  await storeWithIdempotencyKey(idempotencyKey, result);
  return result;
}

이 skill을 설정해두면, Claude가 거래 코드를 작업하거나, 환불 로직에 대해 질문하거나, 결제 흐름을 디버깅할 때 자동으로 결제 도메인 전문 지식을 적용합니다. 별도로 호출할 필요 없이 전문 지식이 항상 활성화되어 있습니다.

### 효과적인 Skills 만들기

**설명부터 시작하세요.** 설명을 먼저 작성한 다음, 그에 맞는 skill 내용을 구성하세요. 설명은 Claude가 언제 해당 skill을 사용할지를 결정하므로 정확하게 작성해야 합니다:

1. skill이 무엇을 제공하는지 명시합니다
2. 구체적인 트리거 조건을 나열합니다
3. 관련 키워드와 문구를 포함합니다

**Skills는 집중적으로 만드세요.** 하나의 skill은 하나의 도메인이나 기능을 다룹니다:

| 좋음 (집중됨) | 나쁨 (너무 광범위) |
|----------------|-----------------|
| `security-auditor` | `code-helper` |
| `react-patterns` | `frontend-stuff` |
| `postgres-optimization` | `database-expert` |
| `api-documentation` | `docs-generator` |

skill이 너무 많은 것을 다루려고 하면 설명이 모호해지고, Claude가 언제 사용해야 할지 안정적으로 인식하지 못하게 됩니다.

**점진적 공개를 활용하세요.** 가장 중요한 정보는 SKILL.md에 직접 넣고, 상세 내용은 참조 파일로 분리하세요:

```markdown

## Quick Reference
[Essential patterns here - Claude sees this immediately]

## Deep Dive
For full coverage, see [DETAILED_GUIDE.md](DETAILED_GUIDE.md).

## Input Validation

### Pattern
```typescript
// Good: Explicit validation with typed errors
const validated = PaymentSchema.safeParse(input);
if (!validated.success) {
  throw new ValidationError(validated.error.issues);
}

// Bad: Implicit coercion
const amount = Number(input.amount); // Silent NaN on invalid input

**실제 요청으로 테스트하세요.** skill을 만든 후 Claude가 이를 활성화하는지 테스트합니다:

Claude가 예상대로 skill을 활성화하지 않으면, 사용하고 있는 트리거 문구를 포함하도록 설명을 수정하세요.

### 팀 공유 전략

**Git 기반 공유 (프로젝트 skills에 권장):**
```bash
# Add skill to project
mkdir -p .claude/skills/team-standard
# Create SKILL.md and supporting files

# Commit
git add .claude/skills/
git commit -m "Add team coding standards skill"
git push

# Teammates get it automatically
git pull
claude  # Skill now available

# Create canonical skill location
mkdir -p ~/shared-skills/security-reviewer
# Create SKILL.md

# Symlink into projects
ln -s ~/shared-skills/security-reviewer ~/.claude/skills/security-reviewer
# Now available in all your projects

my-plugin/
├── .claude-plugin/
│   └── plugin.json
└── skills/
    └── my-skill/
        └── SKILL.md

# Too broad - activates on any "code" mention
description: Help with code

# Specific - activates only for security contexts
description: Audit code for security vulnerabilities including injection attacks, authentication flaws, and data exposure. Use when specifically asked about security, vulnerabilities, or when reviewing code for security issues.

my-plugin/
├── .claude-plugin/
│   └── plugin.json              # Required: metadata
├── commands/                     # Slash commands
│   └── hello.md
├── agents/                       # Subagents
│   └── helper.md
├── skills/                       # Skills
│   └── my-skill/
│       └── SKILL.md
├── hooks/                        # Event handlers
│   └── hooks.json
└── .mcp.json                     # MCP servers

{
  "name": "my-plugin",
  "description": "What this plugin does",
  "version": "1.0.0",
  "author": {
    "name": "Your Name"
  }
}