The tools are largely distinct: read_expenses returns all expenses, add_expense creates a new one, summarize_expenses aggregates by date range, and filter_by_category filters by category. There is minor overlap between read_expenses and filter_by_category, as the latter could be seen as a subset, but the descriptions clearly differentiate their purposes.

All tool names follow a consistent snake_case convention with a verb prefix (read_, add_, summarize_, filter_). The only slight deviation is 'filter_by_category' which uses a preposition, but it still aligns with the overall verb_noun style.

With 4 tools, the server is well-scoped for a basic expense tracker. Each tool serves a clear purpose, though the set feels slightly minimal for a domain that could benefit from update and delete operations.

The core operations of reading and adding expenses are covered, along with useful summaries and category filtering. However, there are notable gaps: no update or delete expense functionality, and filtering is only by category, not by date range (only totals via summarize). These omissions may limit agents that need full lifecycle management.