The Last 24 Hours in AI

Tuesday, October 20, 2026. What builders actually need from the last 24 hours: workflows and tooling first, headlines second. 1. Harness engineering is becoming its own discipline Two harness

Tuesday, October 20, 2026. What builders actually need from the last 24 hours: workflows and tooling first, headlines second. 1. Harness engineering is becoming its own discipline Two harness resources hit the HN front page in one day. Harness Engineering 101 teaches agents from first principles: the LLM is the brain, the harness is the body, and every agent feature (subagents, MCP, hooks, RAG) is a patch to one stateless loop. It builds a ~300-line Python agent chapter by chapter, each followin