Auto-publish Blog Announcements to Social

Auto-publish blog announcements with Postproxy

This template turns your latest blog post into platform-native social posts and publishes them automatically via Postproxy.

It does three things:

1. Pulls the newest blog post (URL + title + featured image).
2. Uses AI to generate two tailored announcements (Twitter/X + LinkedIn).
3. Resolves the correct connected social profiles (real target IDs) and publishes each post to the right account.

What you need

• A Postproxy account + API key: https://postproxy.dev
• The Postproxy connector enabled in Needle (select Postproxy MCP).
• At least one connected social profile in Postproxy (LinkedIn/Twitter/X, etc.).

How the flow works

• Manual Trigger Starts the workflow.

• AI Agent (Fetch latest post) Finds the most recent blog post and extracts the essentials: URL, title, and the featured image. Output is structured for the next step.

• AI Agents (Generate posts) Generates two platform-native announcements from the same article:

  • a shorter, punchier version for Twitter/X
  • a longer, more contextual version for LinkedIn Each output is shaped as an item like: platform, text, url, image_url

• Profiles list (Postproxy) Fetches your connected social profiles from Postproxy, including each profile’s platform and its real target_id. This is what allows publishing to the correct account (not just “to LinkedIn”, but to your LinkedIn profile/page).

• Merge (Join posts + profiles) Combines the generated posts with the available profiles and replaces platform labels (e.g. linkedin) with the matching Postproxy target_id (e.g. yOLU8N). Result: publish-ready items with the correct targets.

• Post publish (Postproxy) Publishes each item through Postproxy using the resolved target_id, attaching text + media in the correct platform format.

Output

• One published post per platform (typically Twitter/X + LinkedIn), each posted to the correct connected profile.

Notes

• If you have multiple profiles per platform, the merge step should choose the intended one (e.g., by profile name or group).
• If you want “human-in-the-loop”, insert an approval step between post generation and publish (e.g., review/edit text before sending).