arnesto: Skill for Claude Code

STARTER_CHARACTER = 📊

Setup

Update the reference docs to get the latest from Anthropic:

python ~/.claude/skills/writing-statuslines/scripts/update-docs.py

What Status Lines Are

Custom scripts that display contextual information at the bottom of Claude Code's interface. Updated when conversation messages change, at most every 300ms.

Configuration

Add to ~/.claude/settings.json (user-level) or .claude/settings.json (project-level):

{
  "statusLine": {
    "type": "command",
    "command": "~/.claude/statusline.sh",
    "padding": 0
  }
}

padding is optional. Set to 0 to let the status line reach the terminal edge.

How It Works

• Claude Code passes session context as JSON via stdin to the script
• First line of stdout becomes the status line text
• ANSI color codes supported
• Script must be executable (chmod +x)
• Only stdout is used (not stderr)

JSON Input Schema

The script receives this via stdin:

{
  "hook_event_name": "Status",
  "session_id": "abc123...",
  "transcript_path": "/path/to/transcript.json",
  "cwd": "/current/working/directory",
  "model": {
    "id": "claude-opus-4-1",
    "display_name": "Opus"
  },
  "workspace": {
    "current_dir": "/current/working/directory",
    "project_dir": "/original/project/directory"
  },
  "version": "1.0.80",
  "output_style": {
    "name": "default"
  },
  "cost": {
    "total_cost_usd": 0.01234,
    "total_duration_ms": 45000,
    "total_api_duration_ms": 2300,
    "total_lines_added": 156,
    "total_lines_removed": 23
  },
  "context_window": {
    "total_input_tokens": 15234,
    "total_output_tokens": 4521,
    "context_window_size": 200000,
    "used_percentage": 42.5,
    "remaining_percentage": 57.5,
    "current_usage": {
      "input_tokens": 8500,
      "output_tokens": 1200,
      "cache_creation_input_tokens": 5000,
      "cache_read_input_tokens": 2000
    }
  }
}

context_window.current_usage may be null if no messages have been sent yet.