MCP server for Substack posts (FastMCP + substack-api-client)
Substack does not provide a native public API for publishing posts.
But authors who want to draft, publish, and schedule from AI agents (Cursor, Claude, and other MCP hosts) still need a way out. This is the MCP server to publish to Substack via any agent.
Will not start without a valid APISUBSTACKAPIKEY (ask). Get API key here: apisubstack.com.
Reality What we built ------ No official Substack write/publish API for authors A posting MCP so agents can create drafts, publish now, and schedule Authors live in the browser editor Authors publish through their agents instead Session-cookie auth is the practical path today substack.sid + your publication URL, gated by an API Substack key
Tool Description ------ testconnection Verify substack.sid and return profile createpost Create draft / publish now / schedule (+ optional tags) getdraft Fetch draft by id updatedraft Update draft fields publishpost Publish existing draft schedulepost Schedule existing draft deletedraft Delete draft listtags List publication tags createtag Create tag settags Ensure + attach tags getposttags List tags on a post/draft
1. Sign in at apisubstack.com, start the free trial, generate an ask API key. 2. Copy your Substack substack.sid cookie: - Open Chrome and sign in to Substack. - Open DevTools → Application → Cookies. - Select https://substack.com (or your publication host, e.g. https://yourname.substack.com). - Find the cookie named substack.sid and copy its Value. 3. Export:
From the project README.
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