Each tool has a clearly distinct purpose: get_mail_quote for pricing, get_wallet_address for address retrieval, get_wallet_balance for balance checking, and send_mail for the core mailing action. There is no overlap or ambiguity between these functions, making tool selection straightforward for an agent.

All tool names follow a consistent verb_noun pattern using snake_case: get_mail_quote, get_wallet_address, get_wallet_balance, and send_mail. The verbs 'get' and 'send' are appropriately applied, and there are no deviations or mixed conventions, ensuring predictable naming throughout.

With 4 tools, the count is reasonable for the server's purpose of handling physical mail via Solana. It covers essential operations like quoting, wallet management, and sending, though it might be slightly thin if advanced features like tracking or cancellation were expected. Overall, it's well-scoped but could benefit from minor additions.

The tool set covers the core workflow: quoting, wallet setup, and sending mail. However, there are minor gaps, such as missing tools for tracking sent mail, canceling transactions, or managing mail templates, which could limit agent flexibility in more complex scenarios. The basics are well-covered, but the surface is not fully comprehensive.