YouTube MCP server: let Claude or any agent upload your videos and Shorts

Set it up and upload, step by step

1. Add PostWire's MCP server to your agent

   In Claude, open PostWire in the connector directory and press Connect. Anywhere else, add the remote server https://postwire.io/api/mcp (Streamable HTTP; OAuth sign-in or an API key) — in Claude Code: claude mcp add --transport http postwire https://postwire.io/api/mcp. Cursor, VS Code, Windsurf, Codex and Gemini CLI configs: MCP client configs.

2. Sign in with your email

   The first time the agent uses a PostWire tool, a sign-in window asks for your email and a 6-digit code; that also creates a free PostWire account if you have none. No password and no card. Agents that cannot do OAuth send an API key instead (dashboard → API & MCP → Copy key).

3. Connect your YouTube channel

   Ask "connect my YouTube". create_connect_link gives you a one-hour link; you sign in with Google on Google's own page and pick the channel. PostWire never sees your Google password.

4. Get the video to PostWire

   Pass a public https link as video_url, or ask for an upload link: create_upload_link opens a 24-hour page where you pick the file on your phone or laptop (MP4, MOV or WebM, up to 1 GB), and get_uploaded_file returns the media_url to post. A video on a host that does not report its size is limited to 80 MB, so big files go through the upload link.

5. Let PostWire write the title, description and tags

   "Write the YouTube title and description for this video, and a TikTok caption." generate_posts returns a title with the main keyword first, a description and 5–8 tags for YouTube — and each other network's version — without publishing anything.

6. Upload it, with the privacy you want

   After you approve, the agent calls post_to_social (or schedule_post with run_at). Say the privacy out loud: without it, PostWire uses the default saved for the channel, and private when there is none.

   {
     "name": "post_to_social",
     "arguments": {
       "platforms": ["youtube"],
       "per_platform": { "youtube": {
         "title": "Cut onboarding to 2 minutes: 3 changes",
         "text": "We cut onboarding from 9 steps to 3. Here is what changed …",
         "tags": ["saas onboarding", "product-led growth", "activation"]
       } },
       "video_url": "https://postwire.io/m/…/demo.mp4",
       "privacy": "public"
     }
   }

7. Check processing

   PostWire sends the file to YouTube in 32 MB pieces with YouTube's resumable upload. A big file that does not finish inside one request carries on from the last confirmed byte a few minutes later, never from zero. get_post_status returns the video's link and YouTube's processing status.

Custom thumbnails go through the REST API's thumbnail_url (an image up to 2 MB); if YouTube refuses the thumbnail, the video still publishes and the result says why.