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Mellow Hub MCP

One post to nine networks, with every network's rules checked before anything goes out - a hosted publishing hub exposed as 12 MCP tools. Posts are validated per channel before publishing, rendered as previews, protected by idempotency keys against double-posting, and gated by per-key grants that decide whether an agent can autopilot-publish or only prepare posts for a human to approve.

Server type: Remote (hosted, Streamable HTTP)
Auth: Mellow Hub key (autopilot or review mode) - endpoint live-verified (key challenge) Sep 10, 2026
Endpoint: https://www.mellow.world/mcp
Networks: Instagram, TikTok, YouTube, X, LinkedIn, Threads, Bluesky, Pinterest, Facebook
Tools: 12 documented
Built by: mellow.world

Why This Matters for Operators

Cross-posting usually means either a fragile browser-automation stack or a pile of separate platform APIs with different limits. Mellow Hub compresses that into one API call with guardrails operators actually need: validate_post returns every problem per channel before anything publishes, preview_post renders what the post will look like on each network, and a timeout-safe idempotency key means a retry returns the original post instead of publishing a second one. The key design is the delegation model - a review-mode key only prepares posts for a person to approve, while an autopilot key publishes within its scoped channels and daily post quota. Per-channel outcomes come back individually (a YouTube rejection on a five-network post is a partial with the failure named, not a silent miss).

Tools & Capabilities

Tool Purpose
whoami What this credential may do: mode, scopes, channels, posts remaining today
list_platforms Every network's rules: caption limits, media kinds, required fields, placements
list_channels Connected accounts and their channel ids
connect_channel Returns a link a person must open to connect a network (human-in-the-loop)
register_media Validate a public media URL, or request an upload URL for bytes and video
validate_post Check a post against every named channel, publishes nothing
preview_post Render the post as it will look on each network
create_post Publish now or schedule (scheduledAt), idempotency key required
get_post Per-channel outcome with public links, partial-failure detail
list_posts Recent posts with status filters
cancel_post Withdraw a scheduled but unpublished post

Installation

claude mcp add mellow https://www.mellow.world/mcp

Create the key at mellow.world/hub/agents. The key is a delegation: pick autopilot (publishes alone, within channel and daily-post limits) or review (prepares posts and stops for human approval).

Configuration

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

One post payload carries one caption, one media list, and a channels array; per-network differences go in options (per network) or perChannel (per account). Everything done with the key is recorded in a journal the owner reads, and revocation is immediate.

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