Kieran’s Substack - The AI Marketing Generalist

Kieran’s Substack - The AI Marketing Generalist

Vibe Prompting: Turn AI Into Your Personal Prompt Engineer

The playbook to master prompt engineering using ChatGPT, custom GPTs, and easy-to-use AI evaluation tools.

Kieran Flanagan's avatar
Kieran Flanagan
Sep 19, 2025
∙ Paid

We have vibe coding, vibe marketing, vibe finance, vibe linkedin comments, you name it, it's now possible to 'vibe' it.

What's surprising to me is that the most powerful form of 'vibing' - Vibe Prompting hasn't gotten a lot of coverage. Let's change that!

Prompting is still the number one AI skill to learn and Vibe Prompting uses LLMs to help you craft more powerful prompts.

The post will use ChatGPT to demonstrate each use case, but you could also use Claude + Projects or Gemini + Gems.

This post will cover the following:

1. Use ChatGPT +memory to coach you on improving prompts

2. Create ‘Prompt Engineer’s via Custom GPTs

4. Evaluate prompts with LLMs

5. Test Prompts with Antropic Console / OpenAI Playground

I aim to keep the post relatively short and very actionable, given everyone is limited on time to read.

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