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Getting Started with ChatGPT

mittwald publishes an official app in the ChatGPT app directory, backed by mittwald MCP. This guide shows you how to install the mittwald app and connect it to your mittwald account using OAuth authentication.

Prerequisites​

  • A ChatGPT account (Plugins are available on all plans, including Free)
  • A mittwald account (to authenticate)
  • 2 minutes to complete setup

Step 1: Install the mittwald App​

  1. Open the mittwald app listing in ChatGPT, or click Plugins in the ChatGPT menu bar (or go to Settings → Plugins → Browse Plugins) and search for "mittwald"
  2. Click Install plugin

Because this is an official, published app, ChatGPT already knows its endpoint and available tools — there is no server URL to enter.

Step 2: Authenticate​

When you first use the mittwald app in a chat:

  1. ChatGPT prompts you to authorize the connection
  2. A browser window opens for mittwald authorization
  3. Sign in with your mittwald account
  4. Review the requested permissions
  5. Click Authorize

Step 3: Verify Your Connection​

  1. Start a new chat in ChatGPT
  2. Click + next to the message input
  3. Select More and choose the mittwald app
  4. Test the connection:
List my mittwald projects

You should see a list of your mittwald projects.

✅ Success! mittwald MCP is now connected to ChatGPT.

Tool Confirmation​

ChatGPT asks for confirmation before executing write operations (creating resources, updating settings, etc.). You can:

  • Approve once: Confirm the specific action
  • Remember approval: Skip confirmation for similar actions in the future

Read-only operations like listing projects run without confirmation prompts.

Common Tasks with mittwald MCP​

Once authenticated, you can use prompts like these:

List Your Projects​

Show all my mittwald projects

Get App Information​

Show apps in my project [project-id]

Database Details​

Get database connection info for [db-id]

Backup Status​

Check backup schedules for project [project-id]

Support Tickets​

List open support conversations for my account

Troubleshooting​

Error: "App Not Available"​

Symptom: The mittwald app does not appear under Plugins or in search results.

Cause: You're not signed in to ChatGPT, or the app listing has not loaded yet.

Fix:

  1. Make sure you're signed in to ChatGPT
  2. Reload the mittwald app listing directly

Error: "Authentication Failed"​

Symptom: OAuth flow fails or times out.

Cause: Browser popup blocked or session expired.

Fix:

  1. Allow popups for chat.openai.com in your browser
  2. Clear browser cookies for mittwald.de
  3. Try again from a different browser

Error: "Tool Not Found"​

Symptom: ChatGPT cannot find mittwald tools after installing the app.

Cause: The installed app metadata has not refreshed yet.

Fix:

  1. Go to Settings → Plugins
  2. Find the mittwald app
  3. Click Refresh to update the tool list, or remove and reinstall the app

Error: "Permission Denied"​

Symptom: Operations fail with authorization errors.

Cause: OAuth tokens expired or permissions changed.

Fix:

  1. Uninstall the mittwald app in Settings
  2. Install it again and re-authenticate

FAQ​

Q: Which ChatGPT plans support the mittwald app?​

A: All ChatGPT plans support Plugins, including the Free tier.

Q: Does this work on mobile?​

A: Yes. Installed apps work on ChatGPT web and mobile apps.

Q: Is my authentication secure?​

A: Yes. ChatGPT uses OAuth for app authentication. Tokens are stored securely by OpenAI.

Q: Can I use multiple apps at once?​

A: Yes. You can install multiple apps and use them in the same conversation.

Q: How do I remove the app?​

A: Go to Settings → Plugins, find the mittwald app, and uninstall it.

Q: Why does ChatGPT ask for confirmation?​

A: Write operations require approval to prevent accidental changes. You can choose to remember approvals for specific action types.

Next Steps​

Official Documentation​

This guide is based on official OpenAI documentation: