The three tools have clearly distinct purposes: sending an email notification, setting a task start time, and formatting a duration. No two tools overlap in action or target resource.

All tool names use a consistent snake_case verb_noun pattern: send_notification, set_task_start_time, format_duration. The convention is predictable and easy to parse.

Three tools are a reasonable, lightweight surface for a mail notifier. Two are timing helpers rather than direct mail operations, so the set is slightly narrow but not inappropriate.

The core send_notification tool is present, and duration helpers exist, but there is no tool to retrieve or clear the stored start time or to calculate/embed elapsed duration into the notification. Other notification scenarios are also absent.