LangChain's Lance Martin:
"context engineering was the discipline everyone learned last year. the agent harness is the one replacing it"
In 50 minutes he explains why Claude Code and Manus are in permanent re-architecture, why Sutton's bitter lesson kills every clever system you build, and what a harness adds without adding complexity
this is the talk that named the layer most people are still building blind
watch it, then read what a harness is actually made of in the article below
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