AI Expense Auto-Categorizer

1. Create a Google Sheet named "Expenses" with columns: Date, Description, Amount, Vendor, Category (leave blank — Claude will fill this), Flagged. 2. In your automation platform, add a Schedule trigger to run every hour (or a Google Sheets trigger for new rows). 3. Add a Google Sheets node to read rows where the Category column is empty. 4. Add an HTTP Request node to call the Claude API (POST https://api.anthropic.com/v1/messages). Set headers: x-api-key: {{YOUR_ANTHROPIC_API_KEY}}, anthropic-version: 2023-06-01, Content-Type: application/json. Use model claude-sonnet-4-20250514. 5. In the request body, send the expense description and amount, asking Claude to return a JSON object with "category" (one of: Travel, Software, Meals, Office Supplies, Marketing, Professional Services, Utilities, Other) and "flagged" (boolean, true if the amount seems unusual for the category). 6. Parse Claude's JSON response and update the Google Sheet row with the category and flagged status. 7. Add a weekly Schedule trigger that reads all categorized expenses, summarizes totals by category, and posts the summary to a Slack channel (e.g., #finance). 8. Test by adding a few sample expenses with varying descriptions and amounts and verifying Claude categorizes them correctly.