Most tools are clearly distinct (e.g., calendar vs event operations). However, feishu_get_available_time and feishu_get_free_busy may overlap in purpose, as both deal with user availability, though free_busy typically shows busy times while available_time suggests open slots. This mild overlap prevents a perfect score.

All tools follow a consistent pattern: 'feishu_' prefix followed by verb_noun (e.g., get_calendar_list, create_event). Naming is uniform and predictable throughout.

With 14 tools, the count is reasonable for a calendar service covering calendars and events, but slightly on the higher end. Each tool appears to have a distinct function, though some could potentially be merged.

The tool set provides comprehensive CRUD coverage for both calendars and events, plus subscription management and availability queries. This covers the core domain thoroughly with no obvious gaps.