Each tool targets a distinct resource (invoice, payment, product, buyer, ledger, inventory) with unique operations (create, get, list). No two tools have overlapping purposes, making it easy for an agent to select the correct one.

All tool names follow a consistent verb_noun pattern (e.g., create_invoice, get_buyer, list_invoices) using lowercase snake_case. No mixing of conventions or vague verbs like 'process' or 'do_thing'.

With 15 tools, the surface is well-scoped for a simple invoicing system covering core entities (invoices, payments, products, buyers, ledgers, inventory). Each tool earns its place without unnecessary bloat or deficiency.

The tool set provides basic CRUD operations (create and read/list) for most entities but lacks update and delete functionalities (e.g., update_invoice, delete_product). While the core workflow of creating and reading is covered, agents may hit dead ends when needing to modify or remove records.