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Promptx
A type system for LLM prompts. Ship with confidence.
A type system for LLM prompts. Define schemas, write behavioural contracts, stress-test with adversarial AI cases or your own ground-truth CSV, and diff fingerprints across versions. Catch prompt regressions before they hit production. Built on Claude Code. No API keys. No dependencies.
I have written system prompts myself and mostly they are always a free text, a block of text based on which AI projects function. If someone makes a bad edit to it, production reflects that. And we have no way of finding it but to read the system prompt and understand the semantic impact of that change ourself before fixing it.
But what if that system prompt was more like a code? Could be validated, tested and then deployed?
That's what I have built using claude code, there are commands and agents to convert a free text prompt into a typescript schema, with proper contracts. We can run diff between 2 or multiple prompt versions to see how the behaviour has changed.
We can test this prompt using adversarial test cases designed to break it (what claude will generate), or even run it on our own ground truth data.
How to run it? All you need is claude code and this project on your system. In examples you can find 3 samples. The netflix one is my favourite.
About Promptx on Product Hunt
“A type system for LLM prompts. Ship with confidence.”
Promptx was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #38 on the daily leaderboard. A type system for LLM prompts. Define schemas, write behavioural contracts, stress-test with adversarial AI cases or your own ground-truth CSV, and diff fingerprints across versions. Catch prompt regressions before they hit production. Built on Claude Code. No API keys. No dependencies.
On the analytics side, Promptx competes within Open Source, Artificial Intelligence and Tech — topics that collectively have 1.2M followers on Product Hunt. The dashboard above tracks how Promptx performed against the three products that launched closest to it on the same day.
Who hunted Promptx?
Promptx was hunted by Ayush Mongia. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Promptx including community comment highlights and product details, visit the product overview.
Ayush Mongia