Each tool targets a distinct phase of the workflow: search returns candidates, get_video reads metadata and parts, read_video returns subtitles, sample_frames returns screenshots, and save_videos/get_save_receipt handle writes vs. verification. The descriptions explicitly delimit boundaries (e.g., search candidates are not auto-saved, preview=true only checks), so an agent can pick correctly.

All eight tools use a uniform bilibili_ prefix with snake_case verb_noun phrasing (list_favorite_folders, read_video, search, get_video, sample_frames, save_videos, get_save_receipt). The only deviation is auth_status, a noun-form status query, which is a widely accepted convention.

Eight tools cover a research-then-save pipeline cleanly, with no redundant or filler entries. Each tool maps to a necessary step (discovery, inspection, verification of write, auth prerequisite).

The lifecycle is well covered: auth check, folder listing for save targets, search, metadata, subtitles, frame sampling, save with dedupe/preview, and receipt readback. Minor gaps remain — no way to list existing watch-later or favorite contents, no comment/metadata enrichment, and function removal is intentionally absent.