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A model alone is a curious oracle. A model in a harness is a worker. The interesting craft of 2025–2026 has been less about better models and more about the satellites: context shaping what the model knows, tools shaping what it can do, verifiers closing the loop on whether it succeeded. The dashed line is the most important — most agents that fail in production fail there.
From the browser's point of view, a static site loads "instantly." Almost all the work — DNS lookup, TLS, edge routing — happens before the bytes even start. Once Cloudflare's edge has matched the host to a Pages project, the rest is internal traffic between Cloudflare's own services. The closer the user is to a Cloudflare PoP, the more this whole diagram collapses into "just a few milliseconds."
Vanilla OAuth 2.0 worried about server-to-server secrets. PKCE (pronounced "pixy") was added because mobile and SPA apps can't keep a secret. The trick: the client invents a random verifier, sends only its SHA-256 hash to the auth server up front, and reveals the verifier itself only when redeeming the code. Even if an attacker intercepts the authorization code, they don't have the original verifier and can't redeem it.