Descriptions do a lot of work to separate reading vs listing vs checking (many explicitly state '不返回正文'), but the four download-start tools (tnd_start_download, tnd_start_discrete_downloads, tnd_start_book_download, tnd_start_chapter_download) overlap heavily and an agent can easily pick the wrong one. Similarly tnd_read_downloaded_chapter(s) vs tnd_get_chapters (local-first batch read with optional download) is a subtle boundary. Read-side tools like tnd_get_book_status, tnd_preview_book, tnd_list_downloaded_chapters and tnd_check_chapters also cluster around the same object with only prose distinguishing them.

All tools follow a uniform tnd_ prefix plus snake_case verb_noun convention (get_, list_, read_, start_, cancel_, retry_). Minor deviation: the generic tnd_start_download sits awkwardly beside the more specific tnd_start_book_download / tnd_start_chapter_download / tnd_start_discrete_downloads, making the verb_object pattern slightly non-parallel. Otherwise very predictable.

24 tools is at the heavy end for a novel downloader; the batch/job lifecycle (start_, wait_, get_batch_status, cancel_batch, retry_batch) plus four separate download-entry points inflates the surface. Each tool has a stated role, but several could be collapsed (e.g. a single start_download with a scope parameter). Borderline over-scoped.

Core lifecycle is covered: search, preview, start download, poll/wait, batch cancel/retry, read local chapters, diagnostics. However, tnd_search_books notes it does '不管理订阅', implying a subscription feature with no corresponding tools, and there is no way to delete/clean library files, cancel a single job, or modify configuration (status only reads the config summary). Notable gaps for a downloader agent.