Headless Mode Automation

Claude Code includes headless mode for non-interactive contexts like CI, pre-commit hooks, build scripts, and automation.

What is Headless Mode

Headless mode allows you to use Claude Code programmatically without an interactive interface. Use the -p flag with a prompt to enable headless mode.

Basic Usage

claude -p "Analyze current project code quality and generate a report"

Common Parameters

• --output-format stream-json - Streaming JSON output
• --allowedTools - Specify allowed tools
• --verbose - Verbose output for debugging

Use Cases

1. Issue Triage

Headless mode can support automation triggered by GitHub events:

claude -p "Analyze this GitHub Issue and add appropriate labels" \
  --allowedTools "Read,Bash(gh:*)"

2. Code Review

Subjective code review beyond traditional tool detection:

claude -p "Check code for typos, outdated comments, and misleading function names" \
  --allowedTools "Read,Write"

3. Batch Processing

Handle large migrations or analysis tasks:

# Generate task list
claude -p "Generate list of files needing React to Vue migration"

# Process in loop
for file in $(cat migration-list.txt); do
  claude -p "Migrate $file from React to Vue" \
    --allowedTools "Edit,Bash(git commit:*)"
done

Important Notes

• Headless mode doesn't persist between sessions - must restart each time
• Use --verbose for debugging, disable in production
• Ensure stable network connection

Related: Multi-Claude Collaboration - Learn parallel collaboration workflows.