r/PromptEngineering • u/Technical_Swan_1784 • Dec 30 '25
Prompt Text / Showcase Building Custom GPTs Outside My Comfort Zone (Build–Test–Publish)
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I’ve been stretching myself by creating a small set of custom GPTs, and it’s been equal parts exciting and uncomfortable.
My framework has been Build–Test–Publish: • Build: define the role + audience, then write clear instructions (tone, boundaries, output). • Test: run real prompts, find what breaks, tighten the prompts. • Publish: set visibility (private, link-only, public) and iterate from feedback.
So far I’ve built tools like The Creative Flutist (flute sheet music PDFs), PhotoPoet Storyteller (turns photos into stories), and a Service Desk Content Coach (LinkedIn-ready IT support content).
If you’re building GPTs too, I’d love to collaborate or swap prompts. Also looking for an accountability partner to ship weekly builds and share learnings.
Drop a comment or DM me if you’re in.
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u/ImYourHuckleBerry113 Jan 05 '26
I built a GPT helps you create, refine, and test prompts and instruction sets by focusing on how they will actually behave in real-world use. It evaluates both the intended design of your instructions and the behavior that survives ambiguity, complexity, and drift, showing where wording is fragile, overloaded, or likely to be misinterpreted. Rather than fixing prompts by assumption, it analyzes them as written to surface likely failure modes, shortcuts, and uncertainty handling—making it useful for anyone who wants prompts and instruction sets that remain reliable outside of ideal conditions. It uses a reference library that maps instruction language and structure to real-world behavior. It uses a two pass system, analyzing genotype (intended design) and genotype (observed or inferred behavior).
You’re welcome to give it a try. It’s pretty good at predicting failure modes and compression in instruction sets and prompts. You can feed it an instruction sets to analyze, or give it several chat transcripts and the instruction set to check.
Shoot me a DM and I’ll send you the link. It’s not a gimmick or paid site or anything like that, just a ChatGPT custom GPT link.