Mellow Hub MCP Server

Mellow Hub MCP

Mellow Hub is a hosted MCP server and REST API that lets an AI agent (Claude, ChatGPT, Cursor and others), or a person, publish and schedule posts to nine social networks: Instagram, TikTok, YouTube, X, LinkedIn, Threads, Bluesky, Pinterest and Facebook.

This repository describes the hosted server. Its source code is not published here, and there is nothing to build or run locally.

• Endpoint: https://www.mellow.world/mcp (Streamable HTTP)
• Registry name: world.mellow.www/hub in the official MCP Registry
• Documentation: https://www.mellow.world/hub/docs
• Made by Spody App, LLC. Contact: contact@mellow.world

Connect

The endpoint speaks OAuth 2.1 with dynamic client registration and PKCE. A client that supports OAuth discovery registers itself and shows the person a consent screen. If a client cannot do OAuth, an API key that the owner creates in the cabinet works as the bearer token on the same endpoint.

Claude Code:

claude mcp add --transport http mellow https://www.mellow.world/mcp

Clients that read an mcp.json:

{
  "mcpServers": {
    "mellow": {
      "type": "http",
      "url": "https://www.mellow.world/mcp"
    }
  }
}

In claude.ai or ChatGPT, add it as a custom connector with the same URL.

What the server does

• whoami says which channels this credential can reach, whether it publishes on its own or only prepares posts for a person to approve, and how many posts remain today.
• validate_post checks a post against every network's own rules (caption length, media count and type, required title or board) before anything is sent, and lists every problem at once.
• create_post publishes now or schedules. Each network succeeds or fails on its own and returns its own link. Idempotency keys stop a retry from posting twice.
• list_channels, list_platforms, preview_post, list_posts, get_post, post_results, cancel_post, reschedule_post and update_post cover the rest of the life of a post; request_upload_url and register_media handle uploads; get_metrics returns post-level views.
• connect_channel hands the person to the Channels page; an agent never receives a network password.

The full and current tool list, with arguments, is in the documentation.

Who is in control

Access is delegated by the owner, on a consent screen: the channels the agent may touch, review or autopilot mode, a daily ceiling and an expiry. Every action is written to a journal the owner can read, and revoking a credential applies on the next request. An agent credential cannot create another credential or approve its own posts.

Limits, stated plainly

• No team seats, no inbox, and no comment or message management for users in general.
• TikTok blocks uploads from an account registered in Russia for everyone but the account's owner.
• Connecting accounts, drafts and validation are free. Publishing needs a subscription after a 7-day trial; plans start at $19 a month.

More

• Free browser tools (carousel maker, character and hashtag counters, image and video checkers): https://www.mellow.world/hub/tools
• Answers about limits and cross-posting: https://www.mellow.world/hub/answers
• Pricing: https://www.mellow.world/hub/pricing