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Scored across 65 tools
Most tools target clearly distinct resources and actions (drafts vs posts vs notes vs subscribers vs analytics). A few overlaps exist, such as get_analytics with the growth_sources report vs get_growth_sources, and get_post vs get_post_by_id vs scrape_post, but the descriptions explicitly differentiate them, so misselection is unlikely.
All 65 names use snake_case and almost uniformly follow a verb_noun pattern (e.g., create_draft, list_posts, update_publication_settings). Minor variations like create_draft_from_template and publish_note_with_link are still predictable and consistent with the rest.
65 tools is far beyond the typical well-scoped range and qualifies as an extreme mismatch. While Substack has a broad surface, many tools could be consolidated (e.g., analytics report variants, list/get pairs) or grouped under fewer parameterized tools, making the count unnecessarily heavy for agent selection.
The surface is very comprehensive, covering drafts, publishing, scheduling, notes, subscribers, analytics, tags, comments, settings, templates, research, and uploads. Minor gaps remain, such as no edit/delete for published posts and no explicit reply-to-Note tool, but core workflows are well supported.