Claude Opus 4.6

1 article

Handdrawn editorial illustration: a capable Claude agent (Anthropic wordmark + symbol legible) straining against heavy scaffolding poles, ropes and bolted-on guard rails labelled "orchestration", "tool wrappers", "fat system prompt"; a lighter, cleaner frame beside it labelled "boundaries that matter"; calm cream background, pen-and-watercolour style
AI EngineeringAgent HarnessHarness Debt

Harness Debt: Your AI Agent Scaffolding Is Quietly Fighting the Model (2026)

Your AI agent is probably worse than the model inside it — and the gap is your own scaffolding. An experimental harness scored over 2x Anthropic's standard one on the same model. The fix isn't a bigger framework; it's deleting the assumptions that went stale the day Claude Opus 4.6 shipped.

Marco Lobo
Marco Lobo·23 May 2026·11 min read