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Add the Firmable MCP server as an app in ChatGPT so it can query Firmable data inside your conversations.
You’ll need the MCP URL and Client ID — see URL & Client ID.

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Add the app

1

Open Settings

In ChatGPT, click your profile at the bottom of the sidebar and choose Settings.
ChatGPT sidebar profile menu with the Settings option
2

Open Apps → Advanced settings

Go to the Apps tab, then click Advanced settings.
ChatGPT Settings Apps tab with the Advanced settings row
3

Enable Developer mode and create an app

Turn on Developer mode (this is what lets you add an unverified custom connector), then click Create app.
ChatGPT Advanced settings with Developer mode enabled and the Create app button
4

Enter the Firmable MCP details

Fill in the New App form:
  • Name: anything you like — this guide uses Firmable
  • Description (optional): e.g. Firmable MCP connector
  • Connection: keep Server URL selected and enter the MCP URL (from URL & Client ID)
  • Authentication: OAuth
ChatGPT New App form with name, description, server URL, OAuth, and the risk acknowledgment checkbox
5

Configure OAuth and create

Expand Advanced OAuth settings and set the Registration method to User-Defined OAuth Client — this lets you use the Firmable credentials. Enter the Client ID (from URL & Client ID; leave the secret blank unless Firmable gives you one). If Firmable asks for a redirect/callback URL, copy the Callback URL shown here.Finally, tick I understand and want to continue to acknowledge that custom MCP servers aren’t reviewed by OpenAI, then click Create.
ChatGPT New App advanced OAuth settings with the Client ID field and Callback URL
6

Sign in with Firmable

On the prompt, click Sign in with Firmable.
Add Firmable to ChatGPT prompt with a Sign in with Firmable button
7

Authorize

Click Allow to grant ChatGPT access to Firmable.
Firmable OAuth screen requesting access, with an Allow button
8

Use it in a chat

Firmable is now connected. Choose when ChatGPT can use it, then enable Firmable from the + → More menu in a chat to start using it.
Connected Firmable app in ChatGPT settings with its permissions and details