# Substack MCP Server and API by Cotlet Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## Substack MCP Server and API by Cotlet

Ask Muse to create post, schedule post and publish Note in your Substack account

- Record: https://musedirectory.ai/connector/substack-mcp-server-and-api-by-cotlet
- Category: Marketing & Ads
- Developer: Cotlet.dev (https://cotlet.dev)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, sign-in needed, 50ms, checked 2026-11-10T16:32:55Z
- Endpoint: https://cotlet.dev/mcp/v1/substack/connect
- Auth: Sign in with your account; Pricing: freemium
- Screening: Screened, no issues found (2026-11-10T16:32:55Z)
- Source: Submitted by its builder and screened before listing

Connects Muse, ChatGPT and Claude to your own Substack account (writer newsletter publishing). Muse can create post, schedule post, publish Note, reply to Notes, send direct message and moderate comments. You sign in to Substack once in your Cotlet Cloud Browser; Cotlet does not store your password and you need no Substack API key. About the official Substack API: Substack has only a limited API (checked 11 Oct 2026).

Example request: "Draft a Substack post about my week and schedule it for Tuesday morning."

How to connect: Substack MCP Server and API by Cotlet is not in Muse's Connectors list yet, and it needs you to sign in with your Substack MCP Server and API by Cotlet account. Apps that need this kind of sign-in usually cannot be used from a Muse chat yet. Follow it here and we will tell you when it reaches Muse.

Screening checks:
- MCP handshake: pass (Requires sign-in (publishes OAuth metadata))
- Domain against threat feeds (Cloudflare security DNS): pass (cotlet.dev not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: n/a (Tools are behind sign-in)
- Inputs asking for passwords, card numbers or seed phrases: n/a (Tools are behind sign-in)
- Domain and redirects: pass (Domain registered 29 days ago)
- AI review of purpose and tool behavior: pass (third-party Cotlet browser handles the Substack session)