Comment by arjie

Custom GPTs are pretty old, but I recently found a use for them. My wife wanted some meeting note-taking and task recording assistance and I found that making a Custom GPT with a trivial Notion API that was scoped to one page[0] with structure that was encoded in the API was a quick couple-hour thing that unlocked a lot of utility for her (the default Notion MCP is "too broad"). It helped that this Custom GPT sits in her ChatGPT UI and she doesn't have to have another app or whatever to make it work.

We liked it quite a bit, but it led to some funny things. We use Reminders to keep our home to-do lists, hers and mine in one list with two sections. I wanted to take this existing flow we had and make it work with a Custom GPT. It's practically impossible because Reminders:

* doesn't have a good API through EventKit

* requires a pop-up permission grant in the UI

So in the end, I did end up making somewhat of an MCP server for it, running it on an old Macbook Pro I had and then sticking Amphetamine on in closed-lid display-sleep mode hooked up to my Tailnet and exposed via a Cloudflare tunnel so that we could use ChatGPT to interact with the thing. Yes, you can see how insane that whole thing is. But there's quite a lot of value to have your AI agent just be the one thing.

0: https://wiki.roshangeorge.dev/w/Blog/2025-10-17/Custom_GPTs