This tutorial demonstrates how to use OpenSpec and OpenCode for spec-driven AI-assisted development by building a fund real-time valuation desktop app with Tauri, covering project planning, UI design with Pencil, OpenSpec's three-phase workflow, and incremental feature implementation.
This guide shows how to install the Pencil VS Code extension, configure Claude Code with Spring Boot 3.5.0, use AI prompts to design a bilingual enterprise login UI, export the design as a .pen file, and automatically generate Vue 3 + ElementPlus code, illustrating the full design‑to‑code and code‑to‑design workflow.
The article compares Figma’s MCP Server integration and Pencil’s Git‑based design files for feeding Claude Code, detailing each workflow, practical constraints, and recommending the best fit for solo developers versus teams with established design systems.
The paper presents PENCIL, a novel alternating generation‑and‑erasure reasoning paradigm that achieves optimal space‑time complexity for chain‑of‑thought tasks, dramatically improves accuracy and efficiency on hard SAT, QBF, and Einstein puzzle benchmarks, and is provably Turing‑complete.
