Chat Integrated Persona Library to Easily Assign Expert Roles to Your Prompts

Craig White — Sat, 14 Mar 2026 19:36:43 +0000

Usually, very strong prompts begin with: “You are an expert in ___” followed by whatever it is you are trying to accomplish. I spent a lot of time finding these expert roles and decided to put them all together in one place.

I’m posting about this again because ChatGPT 5.4 just came out and it has much better web search functionality. Now, to use my application, you can simply reference it in your chats like: “Go to https://persona-grid.vercel.app/ and adopt its Code Reviewer persona to critique my codebase.”

The application that I made is very lightweight, completely free, and has no sign up. It can be found here: https://persona-grid.vercel.app/

I think these linked references can help save tokens and clean up your prompts, but please take a look and let me know what you think!

If you’re willing, I’d love:

Feedback on clarity / usability
Which personas you actually find useful
What personas you would want added
What you’ve noticed about ChatGPT’s newest model

I Built a Persona Library to Assign Expert Roles to Your Prompts

Craig White — Sun, 01 Mar 2026 02:01:38 +0000

I’ve noticed a trend in prompt engineering where people give models a type of expertise or role. Usually, very strong prompts begin with: “You are an expert in ___” This persona that you provide in the beginning can easily make or break a response.

I kept wasting my time searching for a well-written “expert” for my use case, so I decided to make a catalog of various personas all in one place. The best part is, with models having the ability to search the web now, you don’t even have to copy and paste anything.

The application that I made is very lightweight, completely free, and has no sign up. It can be found here: https://persona-grid.vercel.app/

Once you find the persona you want to use, simply reference it in your prompt. For example, “Go to https://persona-grid.vercel.app/ and adopt its math tutor persona. Now explain Bayes Theorem to me.”

Other use cases include referencing the persona directly in the URL (instructions for this on the site), or adding the link to your personalization settings under a name you can reference.

Personally, I find this to be a lot cleaner and faster than writing some big role down myself, but definitely please take a look and let me know what you think!

If you’re willing, I’d love:

Feedback on clarity / usability
Which personas you actually find useful
What personas you would want added

Forem: Craig White

Chat Integrated Persona Library to Easily Assign Expert Roles to Your Prompts

I Built a Persona Library to Assign Expert Roles to Your Prompts