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All tools have clearly distinct purposes, covering delegation, credentials, invoices, points of sale, taxpayer lookup, and health check. No two tools overlap in functionality.

Most tools follow a consistent verb_noun pattern (e.g., check_delegation, emit_invoice). The only minor deviation is keycae_health, which uses a noun_noun format but is still clear.

12 tools is a well-scoped set for an electronic invoicing API. Each tool addresses a distinct aspect of the domain without being excessive or insufficient.

The set covers creation and retrieval but lacks critical operations like invoice cancellation, credential deletion, and delegation revocation. These missing lifecycle steps likely cause agent failures in common workflows.