MCP Fundamentals

Apr 10 2026 · Python 3, JavaScript, macOS , Windows, VS Code

Lesson 05: Building a ChatGPT App

Running the Application

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Now that your server is running and tunneled via Ngrok, it is time to connect it to ChatGPT.

Step 1: Enabling Developer Mode

To connect a local MCP server, you must first enable the specific settings.

Step 2: Configuring the App

  1. Give your app a name, such as “Note Taking App”.
  2. In the MCP Server URL field, paste the Ngrok URL you copied in the previous video.
  3. Crucial Step: You must append /mcp to the end of the URL.
  4. Select No Auth in the Authentication section.
  5. Check the checkbox to confirm that you understand the risk of adding an MCP server.

Step 3: Verifying Actions and Templates

Before you start chatting, look at the summary screen. ChatGPT has successfully queried your server.

Step 4: Interacting with the App

Now, let’s test the workflow.

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