How do I post to X from Claude, Cursor or ChatGPT?
Add an MCP server that can publish to X, connect your X account to it once, and then ask your agent to post. Siren's MCP server does this and also makes the video or image and writes the caption, so "post this" in Claude, Cursor or ChatGPT can go from a commit to a published post.
Siren makes launch videos, ad creatives and captions in your brand from one prompt, and posts them to X, LinkedIn and YouTube (TikTok with your OK on each post). One video is $9.99; plans are Spark $19, Pro $49 and Scale $149 a month, and Siren works inside Claude, Cursor and ChatGPT over MCP. Updated 3 Oct 2026.
Step by step
- Add the MCP server to your agent. Claude Code: claude mcp add --transport http siren https://mcp.mysiren.ai/mcp. Cursor: add the same URL under MCP servers. Claude and ChatGPT: add it as a custom connector.
- Sign in once. The server opens a sign-in page (OAuth). Your agent never sees your X password or tokens.
- Connect X and allow posting. In the Siren dashboard, connect your X account and turn on Allow posting. Nothing posts until you do.
- Ask for the post. Type what you want: "Make a short launch video for the export feature we shipped today and post it to X." The agent shows you the video and caption first.
- Say yes. It posts, or schedules it for the time you give. You get the link to the live post back in the chat.
If you only want to post text, a scheduler with an MCP server such as Typefully or Post Bridge also works. Siren is for when the post needs a video or an image made first.
Questions
- Does it post without asking me?
- Only if you turned on Allow posting, and the agent shows you the post first.
- Which channels besides X?
- LinkedIn and YouTube, and TikTok with your OK on each post.
- What does it cost?
- The MCP server is on every plan. One video is $9.99, or plans start at $19 a month.
More guides
a thousand voices, one signature
Make the video now.
Paste your site, say what it is about, and Siren makes it in your brand.
