Invoice Image Reading

Image Reading Methods

Recommended: Dual Verification (Parallel Two Contexts)

1. Execute two independent readings: In environments where sub-agents are available, launch two sub-agents in parallel and have each read the image independently. Pass the following "Basic Rules" and "Output Format" as prompts to each sub-agent, and specify the image file path.
2. Result collation: Compare key fields (such as amounts) from both reading results.
3. If results match: Adopt the results as-is. Report "Results matched in two independent readings."
4. If results do not match: Present the original image path and both results to the user, and ask them to select the correct one:
   • Clearly indicate fields with discrepancies
   • Offer three options: Adopt A / Adopt B / Manual input

Fallback (When Sub-Agents Are Not Supported)

1. Read the image file directly using the Read tool
2. Extract data according to the "Basic Rules" and "Output Format" below
3. Present the extraction results to the user and always request visual confirmation

Basic Rules

• Read image files using the Read tool (Claude Vision automatically recognizes images)
• Amounts must always be returned as int (integer in yen). Remove commas and the word "yen"
• Dates must be returned in YYYY-MM-DD format
• Convert Japanese calendar years to Western calendar (Reiwa 7 → 2025, Reiwa 6 → 2024, Heisei 31 → 2019)
• For unreadable fields, use UNKNOWN (string) or 0 (amount)
• If multiple files are provided, process all of them in sequence and return the combined results

Output Format

---INVOICE_DATA---
vendor: Vendor name
invoice_number: Invoice number
invoice_registration_number: Qualified invoice issuer number (T+13 digits)
date: YYYY-MM-DD
total_amount: Total invoice amount (int)
tax_amount: Consumption tax amount (int)
items:
  - description: Item/service name
    amount: Amount (int)
    quantity: Quantity (int)
    tax_rate: Tax rate (10 or 8)
---END---

Extraction Points

• Prioritize extracting the total invoice amount (tax-inclusive)
• Confirm the consumption tax amount (distinguish between 10% and 8% reduced tax rates if applicable)
• Check for the presence of an invoice registration number (T+13 digits for qualified invoice issuers)
• Extract the invoice number if available
• Extract the vendor name
• Use the invoice date for the date field (prioritize the invoice date if the issue date and invoice date differ)
• Extract line items to the extent readable (leave items empty if unknown)

Processing Multiple Files

1. Use the Glob tool to retrieve the file list (if a pattern is specified)
2. Read each file sequentially using the Read tool
3. Return the combined results of all files (include the file name before each result)

## file1.jpg
---INVOICE_DATA---
...
---END---

## file2.jpg
---INVOICE_DATA---
...
---END---