My agent shipped 12 clean PRs in a weekend.
The product still isn't live three weeks later.
The harness around the model worked. The harness around me didn't exist. And I think that's the actual story of agentic coding in 2026 — not that the model can't build, but that nothing is holding you to finishing what it builds.
What a harness actually is
If you've done serious agentic coding, you already know the model alone is useless. A raw LLM is a horse with no harness — wild power, pointed nowhere. The harness is everything you wrap around it: scoped tasks, clean context, spec-driven loops, the discipline to not let it run wild. That's what turns a model into an agent that actually does work.
