pCraft

Introducing pCraft: A Workbench for People Who Build With LLMs

For a year my most important work, the prompts, lived in Python strings, scattered notes, and 1am messages to myself, with no version history and no way to fairly compare one model against another. pCraft is my answer: a workbench for building with language models, 'Postman for LLMs', where you bring your own key, wire up multi-step chains, and run the same prompt across several models side by side. This founder-tone launch post covers why I built it, why I think it's useful, and the unglamorous lessons the project taught me: overbuilding infrastructure for a scale that didn't exist, falling in love with an architecture instead of a product, and what it means to hold someone else's API key.

Frank Costoya