A chatbot produces text. An agent calls tools - books a slot, sends an invoice, hits an API. What a ten-person company can bound this month, what must stay behind a human confirm, and how I would wire that in Next.js after this summer’s agent-security news.
Next.js 16.3 went stable on 3 August 2026. Instant Navigations make a server-rendered site feel like an SPA. AGENTS.md, bundled docs, and skills stop coding agents inventing APIs from 2024. What I would actually do on an existing Next.js site this month.
A Mini App is a web product that runs inside Telegram - not a bot, not a native app. How it is wired, how initData auth actually works, the UX constraints that kill a pasted website, and when I would ship one instead of a site.
Telegram Mini AppsWebApp SDKNext.jsProductEngineering
A practical map of database types for web products: relational, document, key-value, graph, time-series, vector - and the 2026 default I ship unless the data model forces something else.