Expense Tracker Skill

---

name: expense-tracker

description: Track expenses and income with multi-backend storage (local/Notion/Google Sheet/Supabase). Credentials are encrypted with AES-256-GCM. Use when user wants to record expenses, view transaction history, or check monthly spending statistics.

---

# Expense Tracker Skill

Quick Start

Initial Setup (First Time)

expense-tracker setup

This will:

1. Ask you to set a master password (for encrypting credentials)

2. Select storage backend and configure API keys

**Storage backends:**

1. **Local file** - No config needed

2. **Notion** - Requires API Key + Database ID

3. **Google Sheet** - Requires credentials path + Spreadsheet ID

4. **Supabase** - Requires URL + Anon Key

Set Password (For Subsequent Uses)

expense-tracker pass <your-password>

Or enter interactively when prompted.

Record Expense

expense-tracker add -50 "lunch" food
# Format: expense-tracker add <amount> <note> <category>
# Negative amount = expense

Record Income

expense-tracker add 5000 "salary" salary
# Positive amount = income

View Records

expense-tracker list              # Recent 10 records
expense-tracker list --month     # This month
expense-tracker list --category  # By category

Statistics

expense-tracker stats             # This month
expense-tracker stats -m 2       # 2 months ago

Security

Credentials are encrypted using **AES-256-GCM** with PBKDF2 key derivation.

Categories

Commands Reference

| Command | Description |

|---------|-------------|

| `setup` | Set password & configure backend (first time) |

| `pass <password>` | Set password for decryption |

| `add <amount> <note> <category>` | Add new record |

| `list` | View recent records |

| `list --month` | This month's records |

| `list --category` | Group by category |

| `stats` | Monthly summary |

| `stats -m <n>` | N months ago |

Data Format

Each record:

{
  "id": "uuid",
  "type": "expense|income",
  "amount": -50,
  "category": "food",
  "note": "lunch",
  "date": "2026-03-03",
  "created_at": "2026-03-03T20:23:00Z"
}