PostPublish
PostPublish for n8n

Automation

PostPublish for n8n

Call PostPublish from an n8n workflow, with the community node or the MCP Client Tool. Ask in plain words and it writes, checks and schedules posts to Facebook Pages, Instagram, Threads, X, LinkedIn and Telegram.

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Set up n8n

  1. 1

    Create an API key in PostPublish (Settings, then AI agents, then API keys). A workflow that only reads can use a read-only key.

  2. 2

    Easiest: in n8n open Settings, Community Nodes, install n8n-nodes-postpublish, and add a PostPublish API credential.

  3. 3

    Or add an MCP Client Tool node to an AI Agent, set the endpoint to https://postpublish.pro/api/mcp, and choose Bearer authentication with your key.

Header for API-key auth
Authorization: Bearer pp_live_YOUR_KEY

Server URL: https://postpublish.pro/api/mcp. OAuth is recommended. If your client cannot do OAuth, create an API key in PostPublish (Settings, then API keys) and send it as a Bearer token; if it only runs local servers, use the stdio bridge with npx mcp-remote.

Example prompts

  • “When a new blog post is published, create a draft for Facebook, Instagram, Threads, X, LinkedIn and Telegram with the title and link.”
  • “Every Monday, list last week's failed posts and notify the team.”
  • “Schedule the approved rows from this sheet, one post per day at 9:00.”
  • “Before scheduling, preview each post against every network's rules and stop on any warning.”

Troubleshooting

The connector or server does not show up.

Check that the URL is exactly https://postpublish.pro/api/mcp and that your version of n8n supports remote MCP servers. If it only supports local servers, use the stdio bridge (npx mcp-remote).

Sign-in loops or fails.

Make sure you can sign in to app.postpublish.pro in the same browser, and that your workspace's trial or plan is active. If it still fails, remove the connection and add it again.

A post is rejected.

Each network has limits (Threads 500 characters, Instagram 2,200, plus media rules). Ask the agent to preview first; it reports warnings before anything is created.

The agent cannot see my accounts.

Connect your Facebook Pages, Instagram, Threads, X, LinkedIn or Telegram accounts in the PostPublish app first, and check that your role or key can read and write posts.

Revoke access

  • Remove the PostPublish connection in n8n's MCP or connectors settings.
  • In the PostPublish app, open Settings, then AI agents, and revoke any key you created for this client. A revoked key stops working immediately.
  • To end an OAuth sign-in, remove the connector in the client. Leaving the workspace ends all access for that user.

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