Invoice Generator#

Create professional invoices from text descriptions or structured data.

Workflow#

1. Collect invoice details from the user (or parse from prompt):
   • Sender (business name, address, email)
   • Recipient (client name, address, email)
   • Line items (description, quantity, unit price)
   • Invoice number, date, due date
   • Payment terms/methods
   • Tax rate (optional)
   • Notes (optional)
2. Read the template at assets/invoice-template.html
3. Replace placeholders with actual data, calculate totals
4. Save as .html file — user can open in browser and Print → PDF

Calculations#

• Subtotal = sum of (quantity × unit price) for each line item
• Tax = subtotal × tax rate
• Total = subtotal + tax
• Always format currency with 2 decimal places

Template Placeholders#

PlaceholderDescription{{INVOICE_NUMBER}}Unique invoice ID{{INVOICE_DATE}}Issue date{{DUE_DATE}}Payment due date{{SENDER_*}}Sender name, address, email, phone{{CLIENT_*}}Client name, address, email{{LINE_ITEMS}}HTML table rows for items{{SUBTOTAL}}Pre-tax total{{TAX_RATE}}Tax percentage{{TAX_AMOUNT}}Calculated tax{{TOTAL}}Final amount due{{PAYMENT_TERMS}}Payment instructions{{NOTES}}Additional notes

Defaults#

• Currency: USD (configurable)
• Tax: 0% unless specified
• Due date: 30 days from invoice date unless specified
• Invoice number: auto-increment or user-specified

Common Mistakes to Avoid#

• Don't guess line items — if the user is vague ("invoice them for the work"), ask for specifics (hours, rate, deliverables)
• Don't invent sender details — use what the user provides or ask
• Don't skip the math — always verify subtotal + tax = total. Rounding errors on invoices are unprofessional
• Don't add fake payment links — only include payment methods the user explicitly provides