Prompt Library — Production System Prompts
Seventeen original, battle-tested prompt templates for real engineering and founder work — code review, bug hunts, JSON extraction, release notes, PRDs, SQL, and more. Fill in the {{variables}}, watch the prompt update live, and copy it straight into your API call. Everything runs in your browser.
About this library
Every template here follows the same production skeleton: a concrete role, an explicit procedure, numbered non-negotiable rules, a defined output format, and a stated fallback for uncertainty. The {{variables}} are auto-detected — fill them in and the prompt substitutes live, so what you copy is ready to paste into a playground, an API call, or an agent config. Unfilled variables stay as placeholders you can wire up in code.
Want to compose your own from scratch instead? The System Prompt Builder walks you through the same skeleton field by field, and the LLM Tool Definition Builder generates the tool-call JSON to pair with these prompts in agent setups.
Everything you type stays on this page — there is no server, no upload, and no tracking of tool inputs.