Auto-Post Your Blog to Social With n8n + Claude

An n8n workflow watches an RSS feed, your blog or a source you curate, and for each new item it asks Claude to write a short, on-brand caption with a couple of hashtags, then sends it to your scheduler to be queued. Publishing and sharing stop being two separate chores, and your feed stays active without you opening a single social app.

You publish a great post, share it once, and then it vanishes. The fix is a small automation that notices each new piece of content, writes a short caption in your voice, and drops it into your social queue. This builds it in n8n with a Claude step.

Right now you do two jobs: write the post, then separately remember to promote it. The second one is the job that slips. This automation welds them together, the moment something new appears in your RSS feed, the sharing happens on its own. RSS is the quiet superpower here: nearly every blog and CMS publishes one automatically, and it is a tidy, machine-readable list of everything you post. That feed becomes the trigger for your entire social presence.

Strip away the tools and this is just three steps in a row:

• Watch — spot a new item in the RSS feed.
• Caption — Claude writes a short, on-brand post about it.
• Queue — the caption lands in your scheduler for a quick review.

That is the whole shape. Build it once and it repeats forever, every new article you write gets a fresh social post without you lifting a finger.

In n8n, start a workflow with an RSS Read node and paste your feed URL (try yoursite.com/feed). On the first run, set it to pull just one item so testing stays tidy. Hit Execute and the latest article appears as structured data, a title, a link, and a summary. That data is now flowing down the workflow, ready for Claude. n8n also remembers which items it has already seen, so nothing gets shared twice.

Add a Claude node and pass it the title and summary, not just the headline. The summary is what makes the caption specific instead of vague. Give it a tight brief:

Write a social caption for this post in a friendly, no-hype voice.
Max 220 characters. End with one short question to invite replies.
Add 1-2 relevant hashtags. Do not restate the title verbatim.

Title: {{ $json.title }}
Summary: {{ $json.summary }}

Claude returns a caption shaped for engagement and grounded in what the post actually says, not a generic "Check out our new blog post!" line.

Add a final node that sends the caption to your social scheduler, or straight to a platform's posting API. Map Claude's caption to the post text and append the article link. The important choice here is to send it as a queued draft, not an instant publish. That gives you a safety net: posts sit waiting for a glance before they go live. Run the workflow once and confirm the queued post looks right before you trust it further.

Two settings keep this clean. First, leave posts as drafts until a week of captions has looked good, then let the queue auto-publish. Second, rely on n8n remembering processed items so each article is shared exactly once. If you ever reset the workflow, set "max items" low first, otherwise it will happily re-queue your entire archive in one burst.

You do not need the whole pipeline to feel the magic. In n8n, drop in just the RSS Read node pointed at your blog, then a Claude node with the prompt above, and execute. Watching Claude turn your latest post into a ready-to-go caption in one click is the moment this clicks, adding the queue step afterward takes ten more minutes.

Take your most recent post and run the draft prompt on it by hand: one post, three platform drafts. If you would publish those drafts, wire the trigger — the automation is only worth having once the output already passes.