multi-currency-expense-aggregator

When the user needs to calculate total expenses across multiple individuals with costs in different currencies and convert them to a target currency using historical exchange rates. This skill handles reading multiple CSV/JSON files containing expense data, fetching exchange rates from financial APIs for specific dates, performing currency conversions, aggregating totals per person, and generating structured JSON reports with calculated results. Key triggers include requests for 'total trip cost', 'expense calculation with exchange rates', 'convert multiple currencies to [target currency]', or tasks involving reading multiple expense files with USD, EUR, TRY, CNY amounts.