2 posts tagged with "boas-praticas"

In the post about prompt, context and harness engineering I split the three layers apart and talked about the harness from the point of view of someone building an agent: idempotency, circuit breakers, approval gates, audit trails.

But most of us aren't building agents. We're using one: Claude Code, OpenCode, Cursor, Codex. Which raises the obvious question: if the tool already ships with a harness, what's left for me to do?

A lot. And it's exactly the part that changes results the most day to day.

Every JavaScript developer has a story with Date. The report that showed the previous day. The due date that jumped from January 31 to March 3. The birth date that changed when the user was in another time zone. The 300KB moment installed just to add a month.

Date was created in 1995, in a few days, copied from java.util.Date. Java itself deprecated most of that API shortly afterwards. JavaScript kept it for 30 years.

That's over. In March 2026 Temporal reached Stage 4 at TC39 and became part of ECMAScript 2026. It already runs without flags in Chrome, Edge, Firefox and Node 26.

This article is about what actually got better. With real, running examples, side by side with new Date().