27 tagged newsletter, measured the same way as everything else here.
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AnthonyDavidAdams/substack-api-reference
Skill Claude CodeCodex
Use Substack's unofficial cookie-authenticated API to read posts, create drafts, publish issues, and manage publications on behalf of a logged-in Substack user. Required when the user asks to post to Substack, schedule a Substack send, mirror content to Substack, or extract data from a Substack account.
Skill Claude Code
Transforms content between formats and platforms. Use when user says 'turn this into', 'repurpose this as', 'make this a', 'atomize this', or 'reformat for'. Creates Twitter/X threads, LinkedIn posts, email newsletters, Instagram carousels, YouTube Shorts scripts, TikTok scripts, Threads posts, Bluesky posts, podcast…
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: