Substack Skill - Create, Edit, Publish, and Manage Posts

Manage Substack publications from the CLI via Substack's internal JSON API using your browser session cookie. Write posts in plain markdown — the skill converts to Substack's ProseMirror editor format (and back when fetching drafts).

CRITICAL: Publishing Confirmation Required

Before running publish or schedule, Claude MUST get explicit user confirmation:

1. Show the user the draft title + a summary of the body.
2. State clearly whether it will email all subscribers (--send-email) or publish to web only (--no-email). The email blast cannot be unsent.
3. Wait for an explicit yes.

Always confirm first. No exceptions. create-draft / update-draft are safe (drafts are private) and do not require confirmation.

First-Time Setup (One-Time)