The 5 pieces of AI plumbing every SaaS needs in 2026 (with code)

Every SaaS is adding AI features in 2026. Most teams burn the first two weeks on the same five pieces of plumbing — none of which are the actual product. Here's each one, with working TypeScript for Next.js 15. 1. A streaming endpoint (not a blocking one) Users won't stare at a spinner for 20 seconds. Stream tokens as they generate with server-sent events: // app/api/chat/route.ts const runner = anthropic.beta.messages.toolRunner({ model: "claude-opus-4-8", max_tokens: 64000,...