tl;dr: The author built a Pokémon app five times each across 12 JavaScript frameworks using Claude Code agents, measuring cost, performance, and maintainability to counter "vibes-based" framework choices in the agentic coding era. Results showed MPA-oriented frameworks like Astro, Hono+htmx, and Nuxt were cheapest to build and produced faster, smaller output, while SvelteKit, Gracile+Lit, and Angular cost the most—with Angular also requiring ~40% more lines of code than Hono+htmx for equivalent functionality. The benchmark is open-sourced on GitHub for others to reproduce or extend.