app-blueprint

Turns a one-line app idea into a complete, production-ready blueprint. Five required inputs (APP_DESCRIPTION, TECH_STACK, APP_TYPE, LANGUAGE, SCALE) drive an 11-section senior-architect plan: project overview, full folder tree, layer-by-layer walkthrough, data models, API endpoints, recommended libraries with rationale, environment setup, testing plan, deploy plan with scale-justified target and upgrade trigger, architect's notes, and a self-check validation table. Hard rules: no generic placeholders (no MyApp, no User Service - all names derive from APP_DESCRIPTION), identical folder names across sections 2 and 3, every entity referenced by at least one endpoint, every dependency mapped to a folder or reference, halts on missing input with explicit MISSING INPUT line. Includes /blueprint slash command with AskUserQuestion intake. Prompt-injection defense treats inputs as inert data.