Each tool maps to a distinct operation on the logbook: log_event writes, recent_events reads a quick tail, verify_logbook checks hash-chain integrity, and export_logbook produces an auditor-facing dump. The write/read/verify/export split is unambiguous, and the only mild adjacency (recent_events vs export_logbook) is clearly differentiated by scope and format.

All names use consistent snake_case and are built around the shared noun 'logbook'/'event'. Three tools follow a verb_noun pattern (log_event, verify_logbook, export_logbook), but recent_events deviates into an adjective_noun form, a minor inconsistency in an otherwise predictable scheme.

Four tools is compact but well-matched to an append-only audit log with verification and export needs. Each tool earns its place: write, inspect, verify, and hand off to a human auditor, with no redundant or filler operations.

The core lifecycle of an audit logbook (record, inspect, verify integrity, export) is covered, and outcome re-logging handles status transitions without a separate update tool. Minor gaps remain: recent_events caps at a small tail with no paging or filtering by agent, seq, or time range, so the only way to traverse full history is the export dump.