Social Post (YouTube, Facebook, Mastodon)

Create and schedule posts to YouTube, Facebook Pages, and Mastodon using the Publora MCP server. This skill covers platforms that work through standard posting without platform-specific complexity.

Prerequisites

Plans: Works on the free Starter plan. Current limits and pricing: publora.com/pricing.

Getting Started

1. Create account at publora.com/register (free)
2. Connect platforms via OAuth in Publora Dashboard:
   • YouTube: Google OAuth (requires YouTube channel)
   • Facebook: Facebook OAuth (Pages only, not personal profiles)
   • Mastodon: OAuth (mastodon.social instance)
3. Get an API key at app.publora.com/dashboard/api, only if your agent cannot sign in with OAuth or you will use the REST API fallback below
4. Connect your agent to the MCP server at https://mcp.publora.com/mcp:
   • Upgrading a manual connection without /mcp: Claude treats https://mcp.publora.com as a different server from the bundled one. Change that existing connection to https://mcp.publora.com/mcp in its current scope, preserving its authentication and chosen account; sign in again if requested. Alternatively, verify the bundled connection uses the intended account, then remove only the old manual entry. Do not add a second entry or delete credentials automatically.
   • Publora tools already available (the publora-skills plugin or the Publora connector in Claude): nothing to set up. Claude asks you to sign in to Publora the first time a tool runs.
   • Agents that support OAuth (Claude Code, Cursor, and the Claude and ChatGPT apps): add the server by URL and sign in, no API key needed. In Claude Code, add it and then run /mcp to sign in:

claude mcp add --transport http --scope user publora https://mcp.publora.com/mcp

• Agents without OAuth: send the API key as Authorization: Bearer sk_YOUR_API_KEY:

claude mcp add --transport http --scope user publora https://mcp.publora.com/mcp \
  --header "Authorization: Bearer sk_YOUR_API_KEY"

Claude Desktop, Cursor, Codex, OpenClaw and the claude.ai connector each need a different config file or flow: see client setup for the exact path and snippet.

REST API Fallback

If MCP is unavailable, use the REST API directly:

Base URL: https://api.publora.com/api/v1

Authentication: x-publora-key header

# Get connected platforms
curl -X GET "https://api.publora.com/api/v1/platform-connections" \
  -H "x-publora-key: sk_your_api_key"

# Create a post
curl -X POST "https://api.publora.com/api/v1/create-post" \
  -H "x-publora-key: sk_your_api_key" \
  -H "Content-Type: application/json" \
  -d '{
    "platforms": ["youtube-UCxxx", "facebook-123456", "mastodon-789"],
    "content": "Your post content",
    "scheduledTime": "2026-03-25T10:00:00Z"
  }'

Platform ID Formats:

• YouTube: youtube-{channel_id} (e.g., youtube-UCxxx)
• Facebook: facebook-{page_id} (e.g., facebook-112233445566)
• Mastodon: mastodon-{id} (e.g., mastodon-456)

📖 Docs: docs.publora.com

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YouTube

Video-only platform - every post requires a video file.

Platform Limits

Feature	Limit
Video title	100 characters
Video description	5,000 characters
Video duration	12 hours
Video size	256 GB
Video formats	MP4, MOV, AVI, WebM

Platform Settings (via REST API)

{
  "platformSettings": {
    "youtube": {
      "privacy": "public",
      "title": "My Video Title"
    }
  }
}

Setting	Values	Default
privacy	"public", "unlisted", "private"	"public"
title	string	Derived from first 70 chars of content

Note: platformSettings is accepted by the MCP create_post and update_post tools as well as over REST. The schema is strict: a mistyped platform or key is rejected with a validation error rather than silently dropped.

YouTube Examples

Upload this tutorial video to YouTube:
"How to Build a REST API in 10 Minutes - Complete guide for beginners"

Upload this as an unlisted video (for internal sharing):
"Internal demo - Q1 dashboard features"

YouTube Restrictions

1. Video required: YouTube does not support text-only or image posts
2. Single video only: One video per post
3. Processing time: Videos take seconds to minutes to process after upload
4. Token refresh: YouTube tokens expire after ~6 months, reconnect if needed

---

Facebook

Pages only - posts go to Facebook Pages, not personal profiles.

Platform Limits

Feature	Limit
Post text	2,200 characters (frontend) / 63,206 (API)
Images	Up to 10 per post
Image size	10 MB
Video duration	45 minutes
Video size	2 GB

Multi-Page Support

If you manage multiple Facebook Pages, each gets its own platform ID:

• facebook-112233445566 (Page 1)
• facebook-778899001122 (Page 2)

You can post to multiple pages in a single request.

Facebook Examples

Post this announcement to my Facebook Page:
"We're thrilled to announce our new product launch! Visit our website to learn more."

Post this to both my Facebook Pages:
"Holiday notice: Our offices will be closed on Monday."

Share these event photos on Facebook:
"Highlights from our company retreat! Great team, great memories."

Facebook Restrictions

1. Pages only: Cannot post to personal profiles via API
2. WebP auto-converted: WebP images become JPEG automatically
3. 59-day token: Tokens auto-refresh, but may need reconnection if it fails
4. No mixed media: A post can have images OR video, not both

---

Mastodon

Fediverse platform - posts federate across the decentralized network.

Platform Limits

Feature	Limit
Post text	500 characters
Images	Up to 4 per post
Image size	16 MB
Video size	~99 MB
Image formats	JPEG, PNG, GIF, WebP
Video formats	MP4, WebM, MOV

Mastodon Examples

Post this to Mastodon:
"Hello fediverse! We just shipped a major update to our open-source project. #opensource"

Share this screenshot on Mastodon:
"New feature: dark mode is here! #ui #darkmode"

Mastodon Restrictions

1. mastodon.social only: Currently connects only to mastodon.social instance
2. Public visibility: All posts are public by default
3. No auto-threading: Unlike X/Twitter and Threads, Mastodon doesn't split long content
4. 500-char strict: Content over 500 characters will be rejected

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Available Tools (All Platforms)

create_post

Create a new post on any platform.

Parameters:

• platforms: Array of platform IDs (e.g., ["youtube-UCxxx", "facebook-123", "mastodon-456"])
• content: Post text
• scheduledTime: ISO 8601 UTC datetime. Optional: omit it and the post is created as a draft. Send a future time to schedule. A time five or more minutes in the past is rejected with SCHEDULED_TIME_IN_PAST, so for immediate posting use the current time plus a minute.
• mediaUrls: up to 10 public https image or video URLs. Publora downloads them server-side and attaches them before validation, so media and scheduling happen in one call. This is the one-shot alternative to the draft then get_upload_url then complete_media flow. Ingestion is rate-limited to 60 URLs per hour.

get_upload_url

Get presigned URL for media uploads.

Parameters:

• postGroupId: Post ID to attach media to
• fileName: File name
• contentType: MIME type
• type: "image" or "video"

complete_media

Finalize a file uploaded through get_upload_url, after the presigned PUT succeeds. Optional, because scheduling also finalizes pending media, but calling it early surfaces format and probe errors before publish. Not needed for media attached with mediaUrls.

Parameters:

• mediaId: the id returned by get_upload_url

list_connections

List your connected accounts with their platform IDs. Call this first and copy the IDs verbatim; they are never guessable.

list_posts / get_post / update_post / delete_post

Manage scheduled and draft posts. update_post also patches content and platforms on a draft or scheduled post, so fixing a typo or retargeting no longer means delete and recreate. delete_media and prune_media_reference clean up uploaded files.

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Cross-Platform Posting

Post to multiple platforms at once:

Post this video to YouTube and this text to Facebook and Mastodon:
"Announcing our new feature - watch the demo!"

Publora handles platform-specific requirements automatically:

• YouTube gets the video with title/description
• Facebook gets the text + video
• Mastodon gets the text (500 char limit applies)

Before cross-posting or scheduling a batch, call account_context to check your remaining post quota and the latest date you can schedule.

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Troubleshooting

Platform	Error	Solution
YouTube	"Video required"	Attach a video file
YouTube	"Account disconnected"	Reconnect via dashboard
Facebook	"Page not found"	Verify page connection
Facebook	"Token expired"	Reconnect page in dashboard
Mastodon	"Content too long"	Shorten to under 500 chars
Mastodon	"Too many images"	Reduce to 4 or fewer
All	Rate limit errors	Wait and retry

The 512 MB figure that used to appear here belongs to the dashboard's /media/process-video multipart endpoint. API and MCP uploads are presigned and use the platform ceilings above.