# Evaluation harness: no shell, no network fetches, no settings inheritance
claude --restricted -p "summarize the architecture of this repo"

# Same lockdown, but deliberately re-enable one tool
claude --restricted --tools WebFetch -p "check the linked RFC"

# Start interactive session
claude

# Start with initial prompt
claude "explain the authentication flow"

# Single query, then exit
claude -p "what does this function do?"

# Process file content
cat error.log | claude -p "explain this error"

# Chain with other tools
claude -p "list todos" | grep "URGENT"

# Use Opus 5 for complex tasks
claude --model opus "design a caching strategy"

# Use Haiku 4.5 for quick tasks
claude --model haiku -p "format this JSON"

# Full model name
claude --model claude-sonnet-4-6-20250929 "review this code"

# With fallback for reliability
claude -p --model opus --fallback-model sonnet "analyze architecture"

# Use opusplan (Opus plans, Sonnet executes)
claude --model opusplan "design and implement the caching layer"

# Complete custom persona
claude --system-prompt "You are a senior security engineer. Focus on vulnerabilities."

# Append specific instructions
claude --append-system-prompt "Always include unit tests with code examples"

# Load complex prompt from file
claude -p --system-prompt-file ./prompts/code-reviewer.txt "review main.py"

# Read-only mode for code review
claude --permission-mode plan "review this codebase"

# Restrict to safe tools only
claude --tools "Read,Grep,Glob" -p "find all TODO comments"

# Allow specific git commands without prompts
claude --allowedTools "Bash(git status:*)" "Bash(git log:*)"

# Block dangerous operations
claude --disallowedTools "Bash(rm -rf:*)" "Bash(git push --force:*)"

# Plain text (default)
claude -p "explain this code"

# JSON for programmatic use
claude -p --output-format json "list all functions in main.py"

# Streaming JSON for real-time processing
claude -p --output-format stream-json "generate a long report"

# Structured output with schema validation
claude -p --json-schema '{"type":"object","properties":{"bugs":{"type":"array"}}}' \
  "find bugs in this code and return as JSON"

# Work across multiple project directories
claude --add-dir ../frontend ../backend ../shared "find all API endpoints"

# Load custom settings
claude --settings '{"model":"opus","verbose":true}' "complex task"

# Load GitHub MCP server
claude --mcp-config ./github-mcp.json "list open PRs"

# Strict mode - only specified servers
claude --strict-mcp-config --mcp-config ./production-mcp.json "deploy to staging"

# Continue last conversation
claude -c

# Resume named session
claude -r "feature-auth" "continue implementing login"

# Fork session for experimentation
claude --resume feature-auth --fork-session "try alternative approach"

# Use specific session ID
claude --session-id "550e8400-e29b-41d4-a716-446655440000" "continue"

# Fork a session to try a different approach
claude --resume abc123 --fork-session "try alternative implementation"

# Fork with a custom message
claude -r "feature-auth" --fork-session "test with different architecture"

# Preview what would be deleted (safe)
claude project purge ~/work/repo --dry-run

# Delete state for a specific project, no prompts
claude project purge ~/work/repo --yes

# Walk every project interactively
claude project purge --all --interactive

# Limit autonomous actions
claude -p --max-turns 5 "refactor this module"

# Debug API calls
claude --debug "api" "test query"

# Enable IDE integration
claude --ide "help me with this file"

{
  "agent-name": {
    "description": "Required: when to invoke this agent",
    "prompt": "Required: system prompt for the agent",
    "tools": ["Optional", "array", "of", "tools"],
    "model": "optional: sonnet|opus|haiku"
  }
}

{
  "code-reviewer": {
    "description": "Expert code reviewer. Use proactively after code changes.",
    "prompt": "You are a senior code reviewer. Focus on code quality, security, and best practices.",
    "tools": ["Read", "Grep", "Glob", "Bash"],
    "model": "sonnet"
  },
  "debugger": {
    "description": "Debugging specialist for errors and test failures.",
    "prompt": "You are an expert debugger. Analyze errors, identify root causes, and provide fixes.",
    "tools": ["Read", "Edit", "Bash", "Grep"],
    "model": "opus"
  },
  "documenter": {
    "description": "Documentation specialist for generating guides.",
    "prompt": "You are a technical writer. Create clear, comprehensive documentation.",
    "tools": ["Read", "Write"],
    "model": "haiku"
  }
}

# Define custom agents inline
claude --agents '{
  "security-auditor": {
    "description": "Security specialist for vulnerability analysis",
    "prompt": "You are a security expert. Find vulnerabilities and suggest fixes.",
    "tools": ["Read", "Grep", "Glob"],
    "model": "opus"
  }
}' "audit this codebase for security issues"

# Load agents from file
claude --agents "$(cat ~/.claude/agents.json)" "review the auth module"

# Combine with other flags
claude -p --agents "$(cat agents.json)" --model sonnet "analyze performance"

# Open the Agent View
claude agents

name: AI Code Review

on: [pull_request]

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Install Claude Code
        run: npm install -g @anthropic-ai/claude-code

      - name: Run Code Review
        env:
          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
        run: |
          claude -p --output-format json \
            --max-turns 1 \
            "Review the changes in this PR for:
            - Security vulnerabilities
            - Performance issues
            - Code quality
            Output as JSON with 'issues' array" > review.json

      - name: Post Review Comment
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const review = JSON.parse(fs.readFileSync('review.json', 'utf8'));
            // Process and post review comments

pipeline {
    agent any
    stages {
        stage('AI Review') {
            steps {
                sh '''
                    claude -p --output-format json \
                      --max-turns 3 \
                      "Analyze test coverage and suggest missing tests" \
                      > coverage-analysis.json
                '''
            }
        }
    }
}

# .github/workflows/ultrareview.yml
- name: Claude ultrareview
  run: claude ultrareview ${{ github.event.pull_request.number }} --json --no-post > review.json

# Analyze error logs
tail -1000 /var/log/app/error.log | claude -p "summarize these errors and suggest fixes"

# Find patterns in access logs
cat access.log | claude -p "identify suspicious access patterns"

# Analyze git history
git log --oneline -50 | claude -p "summarize recent development activity"

# Review a specific file
cat src/auth.ts | claude -p "review this authentication code for security issues"

# Generate documentation
cat src/api/*.ts | claude -p "generate API documentation in markdown"

# Find TODOs and prioritize
grep -r "TODO" src/ | claude -p "prioritize these TODOs by importance"

# Start a feature branch session
claude -r "feature-auth" "let's implement user authentication"

# Later, continue the session
claude -r "feature-auth" "add password reset functionality"

# Fork to try an alternative approach
claude --resume feature-auth --fork-session "try OAuth instead"

# Switch between different feature sessions
claude -r "feature-payments" "continue with Stripe integration"

# Save agents config to file
cat > ~/.claude/agents.json << 'EOF'
{
  "reviewer": {
    "description": "Code reviewer for PR reviews",
    "prompt": "Review code for quality, security, and maintainability.",
    "model": "opus"
  },
  "documenter": {
    "description": "Documentation specialist",
    "prompt": "Generate clear, comprehensive documentation.",
    "model": "sonnet"
  },
  "refactorer": {
    "description": "Code refactoring expert",
    "prompt": "Suggest and implement clean code refactoring.",
    "tools": ["Read", "Edit", "Glob"]
  }
}
EOF

# Use agents in session
claude --agents "$(cat ~/.claude/agents.json)" "review the auth module"

# Process multiple files
for file in src/*.ts; do
  echo "Processing $file..."
  claude -p --model haiku "summarize this file: $(cat $file)" >> summaries.md
done

# Batch code review
find src -name "*.py" -exec sh -c '
  echo "## $1" >> review.md
  cat "$1" | claude -p "brief code review" >> review.md
' _ {} \;

# Generate tests for all modules
for module in $(ls src/modules/); do
  claude -p "generate unit tests for src/modules/$module" > "tests/$module.test.ts"
done

# Read-only security audit
claude --permission-mode plan \
  --tools "Read,Grep,Glob" \
  "audit this codebase for security vulnerabilities"

# Block dangerous commands
claude --disallowedTools "Bash(rm:*)" "Bash(curl:*)" "Bash(wget:*)" \
  "help me clean up this project"

# Restricted automation
claude -p --max-turns 2 \
  --allowedTools "Read" "Glob" \
  "find all hardcoded credentials"

# Get structured analysis
claude -p --output-format json \
  --json-schema '{"type":"object","properties":{"functions":{"type":"array"},"complexity":{"type":"string"}}}' \
  "analyze main.py and return function list with complexity rating"

# Integrate with jq for processing
claude -p --output-format json "list all API endpoints" | jq '.endpoints[]'

# Use in scripts
RESULT=$(claude -p --output-format json "is this code secure? answer with {secure: boolean, issues: []}" < code.py)
if echo "$RESULT" | jq -e '.secure == false' > /dev/null; then
  echo "Security issues found!"
  echo "$RESULT" | jq '.issues[]'
fi

# Extract specific fields
claude -p --output-format json "analyze this code" | jq '.result'

# Filter array elements
claude -p --output-format json "list issues" | jq -r '.issues[] | select(.severity=="high")'

# Extract multiple fields
claude -p --output-format json "describe the project" | jq -r '.{name, version, description}'

# Convert to CSV
claude -p --output-format json "list functions" | jq -r '.functions[] | [.name, .lineCount] | @csv'

# Conditional processing
claude -p --output-format json "check security" | jq 'if .vulnerabilities | length > 0 then "UNSAFE" else "SAFE" end'

# Extract nested values
claude -p --output-format json "analyze performance" | jq '.metrics.cpu.usage'

# Process entire array
claude -p --output-format json "find todos" | jq '.todos | length'

# Transform output
claude -p --output-format json "list improvements" | jq 'map({title: .title, priority: .priority})'

> **Fable 5.1 и алиас `fable` (v2.1.257)**: Fable 5.1 (`claude-fable-5-1`) вышел в составе **v2.1.257**, и алиас `fable` теперь указывает на него, а не на Fable 5. На официальной странице конфигурации моделей указано, что Fable 5.1 «требует Claude Code v2.1.255 или новее», однако версия 2.1.255 так и не была опубликована - v2.1.257 стала первым релизом, в котором её реально можно установить. На шлюзе Claude apps алиасы `fable` и `best` по-прежнему указывают на **Fable 5**; там 5.1 нужно выбирать явно через `/model`.

> **Fast Mode работает на Opus 5 и Opus 4.8 (v2.1.219)**: Начиная с v2.1.219, `/fast` применим к **Opus 5 и Opus 4.8** - Opus 4.7 из fast mode убран. Fast mode на Opus 5 тарифицируется по $10/$50 за Mtok. Впервые fast mode переехал на Opus 4.8 в v2.1.154 (примерно 2× стандартного тарифа при ~2,5× скорости генерации), а до этого в v2.1.142 переключился с Opus 4.6 на Opus 4.7. Переменная окружения `CLAUDE_CODE_OPUS_4_6_FAST_MODE_OVERRIDE` была **объявлена устаревшей в v2.1.154 и удалена 2026-06-01**; fast mode на Opus 4.6 больше недоступен - используйте Opus 5 или Opus 4.8.

### Уровни effort (Opus 5 / Sonnet 5 / Opus 4.8 / Opus 4.7)

Opus 5, Sonnet 5, Opus 4.8 и Opus 4.7 поддерживают адаптивный reasoning с уровнями effort, перечисленными от самого лёгкого к самому тяжёлому: `low` (○), `medium` (◐), `high` (●), `xhigh` и `max`. **По умолчанию** используется `high` на Opus 5, Sonnet 5, Opus 4.8 (с v2.1.154), Opus 4.6 и Sonnet 4.6, и `xhigh` на Opus 4.7. `xhigh` доступен на Opus 5, Sonnet 5, Opus 4.8 и Opus 4.7; `max` - на Opus 5, Sonnet 5, Opus 4.8/4.7/4.6 и Sonnet 4.6 (только в рамках сессии). У Haiku 4.5 уровней effort нет. На Opus 4.6 / Sonnet 4.6 значение effort по умолчанию для подписчиков Pro/Max было повышено с `medium` до `high` в v2.1.117.
```bash
# Set effort level via CLI flag
claude --effort high "complex review"

# Set effort level via slash command
/effort high

# Set effort level via environment variable
export CLAUDE_CODE_EFFORT_LEVEL=high   # low, medium, high, xhigh (Opus 5, Sonnet 5, Opus 4.8/4.7), or max - default is high on Opus 5

{
  "wheelScrollAccelerationEnabled": false,
  "language": "french",
  "footerLinksRegexes": ["https://jira\\.example\\.com/.*"]
}

### Комбинации флагов
| Use Case | Command |
|----------|---------|
| Quick code review | `cat file \| claude -p "review"` |
| Structured output | `claude -p --output-format json "query"` |
| Safe exploration | `claude --permission-mode plan` |
| Autonomous with safety | `claude --permission-mode auto` |
| CI/CD integration | `claude -p --max-turns 3 --output-format json` |
| Resume work | `claude -r "session-name"` |
| Custom model | `claude --model opus "complex task"` |
| Minimal mode | `claude --bare "quick query"` |
| Budget-capped run | `claude -p --max-budget-usd 2.00 "analyze code"` |
---

## Устранение неполадок

### Команда не найдена

**Проблема:** `claude: command not found`

**Решения:**
- Установите Claude Code: `npm install -g @anthropic-ai/claude-code`
- Убедитесь, что в PATH добавлен каталог глобальных бинарников npm
- Попробуйте запустить по полному пути: `npx claude`

### Проблемы с API-ключом

**Проблема:** Ошибка аутентификации

**Решения:**
- Задайте API-ключ: `export ANTHROPIC_API_KEY=your-key`
- Убедитесь, что ключ действителен и на нём достаточно средств
- Проверьте, что у ключа есть доступ к запрашиваемой модели

### Сессия не найдена

**Проблема:** Не удаётся возобновить сессию

**Решения:**
- Выведите список доступных сессий, чтобы узнать правильное имя/ID
- Сессии могут истекать после периода бездействия
- Используйте `-c`, чтобы продолжить последнюю сессию

### Проблемы с форматом вывода

**Проблема:** Некорректный JSON на выходе

**Решения:**
- Используйте `--json-schema`, чтобы принудительно задать структуру
- Добавьте в prompt явные инструкции по формату JSON
- Используйте `--output-format json` (а не просто просьбу вернуть JSON в prompt)

### Доступ запрещён

**Проблема:** Запуск инструмента заблокирован

**Решения:**
- Проверьте значение `--permission-mode`
- Проверьте флаги `--allowedTools` и `--disallowedTools`
- Для автоматизации используйте `--dangerously-skip-permissions` (с осторожностью)

---

## Дополнительные ресурсы

- **[Официальный справочник CLI](https://code.claude.com/docs/en/cli-reference)** - полный справочник команд
- **[Документация по headless-режиму](https://code.claude.com/docs/en/headless)** - автоматизированный запуск
- **[Slash-команды](../01-slash-commands/)** - пользовательские сокращения внутри Claude
- **[Руководство по памяти](../02-memory/)** - постоянный контекст через CLAUDE.md
- **[Протокол MCP](../05-mcp/)** - интеграция с внешними инструментами
- **[Продвинутые возможности](../09-advanced-features/)** - режим планирования, extended thinking
- **[Руководство по subagents](../04-subagents/)** - делегирование выполнения задач

---

*Часть серии руководств [Claude How To](../)*

---

**Последнее обновление**: 6 сентября 2026 г.
**Версия Claude Code**: 2.1.263
**Источники**:
- https://code.claude.com/docs/en/cli-reference
- https://code.claude.com/docs/en/env-vars
- https://code.claude.com/docs/en/changelog#2-1-174
- https://code.claude.com/docs/en/changelog#2-1-176
- https://code.claude.com/docs/en/changelog
- https://code.claude.com/docs/en/settings
- https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md
- https://code.claude.com/docs/en/troubleshooting
- https://code.claude.com/docs/en/commands
- https://code.claude.com/docs/en/model-config
- https://platform.claude.com/docs/en/about-claude/models/overview
- https://www.anthropic.com/news/claude-opus-4-8
- https://github.com/anthropics/claude-code/releases/tag/v2.1.117
- https://github.com/anthropics/claude-code/releases/tag/v2.1.139
- https://github.com/anthropics/claude-code/releases/tag/v2.1.142
- https://github.com/anthropics/claude-code/releases/tag/v2.1.154
- https://code.claude.com/docs/en/plugins
- https://code.claude.com/docs/en/overview
- https://code.claude.com/docs/en/sub-agents
- https://code.claude.com/docs/en/headless
- https://code.claude.com/docs/en/cli-reference.md
- https://code.claude.com/docs/en/settings.md
- https://code.claude.com/docs/en/settings-reference
**Совместимые модели**: Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Sonnet 4.6, Claude Opus 4.8, Claude Haiku 4.5