An MCP server that uploads one video to TikTok and YouTube Shorts

Step by step

1. Add the server to your client

   Hosted (Streamable HTTP, OAuth 2.1 sign-in or an API key): https://postwire.io/api/mcp. In Claude, add PostWire from the connector directory; in Claude Code: claude mcp add --transport http postwire https://postwire.io/api/mcp. Configs for Cursor, VS Code and Windsurf: MCP client configs.

2. Connect TikTok and YouTube

   Ask the agent to connect them: create_connect_link returns a one-hour link per network. YouTube signs in with Google for the channel; TikTok with TikTok.

3. Get the video to PostWire

   create_upload_link returns a single-use link valid for 24 hours. Open it on the phone or laptop that has the video and upload (up to 1 GB). Then get_uploaded_file returns its media_url (kept 30 days). Already hosted? Use its public https URL instead.

4. Write the captions

   generate_posts with {"prompt":"…","platforms":["tiktok","youtube","instagram"],"media_url":"…"} returns a TikTok caption, a YouTube title (≤100 characters), description and tags, and an Instagram caption. Nothing is published yet.

5. Publish after approval

   Call post_to_social with the approved drafts and the video:

   {
     "name": "post_to_social",
     "arguments": {
       "platforms": ["tiktok", "youtube", "instagram"],
       "per_platform": { "tiktok": {"text": "…"}, "youtube": {"text": "…", "title": "…", "tags": ["…"]}, "instagram": {"text": "…"} },
       "video_url": "https://postwire.io/m/…",
       "privacy": "public"
     }
   }

6. Check processing

   TikTok and YouTube process video after upload; get_post_status with the id from the result says when it is live. Or queue it with schedule_post and a run_at.

Set privacy explicitly: through the API, TikTok posts with no privacy value are published as private (SELF_ONLY) and YouTube uploads default to private. YouTube categorizes a square or vertical video of up to three minutes as a Short.