ChatGPT
Add Firmable as an app in ChatGPT.
Add the Firmable MCP server as an app in ChatGPT so it can query Firmable data inside your conversations.
Add the app
Open Apps → Advanced settings
Go to the Apps tab, then click Advanced settings.
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.
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
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.
Sign in with Firmable
On the prompt, click Sign in with Firmable.
Authorize
Click Allow to grant ChatGPT access to Firmable.
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.
