How to connect ChatGPT to PostMCP AI (Step by Step)

Connecting ChatGPT to PostMCP AI turns your ChatGPT chat window into a live command center for seven social networks: Bluesky, LinkedIn, X (Twitter), Instagram, Facebook, Threads, and YouTube Shorts.

Instead of juggling multiple tabs, copying and pasting copy, or logging into separate schedulers, you can simply instruct ChatGPT: “Write a post about AI and publish it to Bluesky with PostMCP.” ChatGPT drafts the post, calls PostMCP tools, and publishes it live to your account in seconds.

Before you start

• A PostMCP AI account (free to sign up at the login page with Apple, GitHub, or Google — comes with 20 free monthly posts).
• At least one connected social network (such as Bluesky, LinkedIn, or X) in your PostMCP workspace.
• A ChatGPT Plus, Pro, Team, or Enterprise account (Developer Mode and custom MCP connectors are available on these tiers).

Step 1 — Sign in to PostMCP AI

Navigate to the PostMCP Sign In page. You can authenticate with one click using your Apple, GitHub, or Google account. There are no lengthy registration forms or password configurations.

Once signed in, PostMCP provisions a dedicated workspace for you, protected by AES-256 vault encryption for your credentials.

Step 2 — Connect your social accounts

From the dashboard sidebar, navigate to Accounts and click Connect New Account (or click the plus icon). A modal titled Integrate Social Channel appears with all supported platforms.

Click the + button next to your desired platform — for example, Bluesky, LinkedIn, or X / Twitter:

1. 1
   Bluesky

   Provide your Bluesky handle and an App Password generated in your Bluesky account settings. Your profile is linked in seconds.

2. 2
   LinkedIn

   Authorize via official LinkedIn OAuth. Connect either personal profiles or company pages that you manage.

3. 3
   X / Twitter

   Sign in through Twitter OAuth 2.0 to grant post and thread publishing permissions.

4. 4
   Meta (Instagram & Facebook)

   Authorize through Facebook Business Login to enable automated publishing to Instagram Business profiles and Facebook Pages.

Once connected, your account shows an active status badge in the dashboard, confirming that PostMCP is ready to post on your behalf.

Step 3 — Copy your unique MCP Server URL

In the PostMCP dashboard left navigation bar, click on AI Integration (under the AUTOMATE section). This tab generates ready-to-use configurations for AI assistants including ChatGPT, Claude, Cursor, Antigravity, and OpenClaw.

Click on the ChatGPT setup card. You will see a 3-step setup walkthrough built specifically for ChatGPT Developer Mode.

Click the blue Copy URL button in Step 1. Your clipboard will hold a URL formatted like: https://mcp.postmcpai.com/mcp?apikey=pmcp_sec_••••.

Step 4 — Enable Developer Mode in ChatGPT

To use custom MCP servers in ChatGPT, you first need to turn on Developer Mode. This enables ChatGPT’s Model Context Protocol client so it can connect to external servers like PostMCP AI.

1. 1
   Open Settings from your Profile Avatar

   In the bottom-left corner of ChatGPT, click on your profile avatar (or name). A popup menu will appear with your account options — click Settings.

2. 2
   Navigate to Advanced Settings

   Inside the Settings modal, click on the Advanced tab in the sidebar list.

3. 3
   Toggle Developer Mode ON

   Locate the Developer Mode switch and toggle it to ON. This reveals the Connectors and custom MCP app features.

Once inside the Settings modal, click Advanced on the left and switch Developer Mode to ON:

With Developer Mode active, ChatGPT enables its internal Model Context Protocol runtime and reveals the Connectors and custom apps interface.

Step 5 — Create the PostMCP connector in ChatGPT

Once Developer Mode is enabled, open Plugins / Connectors in ChatGPT and click New App (or navigate to chatgpt.com/plugins#settings/Connectors?create-connector=true).

Configure each field in the New App modal as follows:

Click Create. ChatGPT connects to PostMCP’s HTTPS endpoint, negotiates protocol schemas, and loads all 16 publishing and account tools.

Step 6 — Prompt ChatGPT to draft and publish

Start a new chat in ChatGPT. You can now prompt ChatGPT in plain English to create and publish content using your connected PostMCP accounts.

Here is an example prompt that asks ChatGPT to write a thought-provoking post about AI and publish it directly to Bluesky:

“write somthing about ai and post on bluskey using postmcpai”

Notice what ChatGPT does automatically during this exchange:

1. 1
   Tool Detection

   ChatGPT reads your request, sees you mentioned "bluskey using postmcpai", and resolves the PostMCP connector tools.

2. 2
   Platform Preflight & Composition

   ChatGPT crafts a compelling post suited for the platform, adhering to character limits and adding relevant tags (#AI, #Technology, #Future).

3. 3
   Direct Execution & Link Return

   ChatGPT calls the publishing tool (create_post / publish_post_now) and immediately outputs the confirmation message with the live URL: “Done! 🚀 I created and published an AI post to your connected Bluesky account using PostMCP. View the Bluesky post ↗”.

Step 7 — Verify the live published post

Click the View the Bluesky post ↗ link returned in the chat. You will be taken directly to your live post on the social network!

Here is the exact live post generated and published in this run:

“AI is not just a tool — it's a new way to think, create, and solve problems. 🤖 The future belongs to people who combine AI with creativity and critical thinking. 🚀 #AI #Technology #Future”

Managing and reviewing posts in PostMCP

Every action taken by ChatGPT is mirrored in your PostMCP dashboard in real time. If you ask ChatGPT to schedule a post for next Tuesday, or draft a campaign across multiple accounts, it appears immediately on your Content Calendar.

More powerful prompts to try

Once the connector is set up, you can execute complex multi-network workflows from a single prompt:

1. 1
   Multi-platform fan out with custom copy

   “Draft a product launch update for LinkedIn and X. Make the LinkedIn post detailed with bullet points, keep X under 280 characters with hashtags, and ask for my confirmation before publishing.”

2. 2
   Dry-run preflight check

   “Check my connected accounts on PostMCP and verify if all OAuth tokens are healthy. Report any platforms that need reconnection.”

3. 3
   Visual Content Scheduling

   “Schedule a motivational tip about developer productivity for Friday at 10:00 AM EST on Bluesky and Threads.”

Troubleshooting common setup hurdles

1. 1
   Developer Mode is missing in ChatGPT

   Developer Mode is only available to ChatGPT Plus, Pro, Team, and Enterprise users. Ensure your subscription is active. If you are on an Enterprise or Team plan, confirm that your workspace admin has not disabled developer settings.

2. 2
   Connection error when creating the connector

   Verify that you copied the complete URL including ?apikey=pmcp_sec_•••. Ensure you selected "Server URL" rather than "Tunnel", and that there are no accidental spaces in the pasted string.

3. 3
   ChatGPT cannot find a connected account

   Confirm that you completed the OAuth connection in Step 2 on the PostMCP Accounts tab. You can ask ChatGPT: "List my connected accounts on PostMCP" to verify what profiles are currently available.

4. 4
   Post failed due to token expiration

   Social platform tokens occasionally expire or need re-authorization. If a post fails, simply go to your PostMCP Accounts tab, click Reconnect next to the platform, and try again in ChatGPT.

Summary

With PostMCP AI connected to ChatGPT via the Model Context Protocol, you no longer need manual copy-pasting or third-party scheduling dashboards. You have an intelligent, full-featured social publishing assistant directly inside your chat window.

To connect other AI tools like Claude or Cursor to the same workflow, check out our step-by-step guide on how to connect Claude to PostMCP AI, explore our AI Agents hub, and read our guide on what a social media MCP server is.