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Updated 6 Nov
Engineers say the code wrapped around the model decides more than which model they pick
AI in Product
- Engineers say the loop around the model, its tool feedback, its context, and its cache matter more than which model they pick.
- Teams running agents in production put the outcome down to sandboxes, gateways, checkpoints, and the harness, each describing a system they built.
- Several add that the same practice keeps being renamed, from prompt to context to harness to loop engineering.
- One source names the cost: the wrapper encodes assumptions about what the model cannot do alone, and those become overhead once a better model arrives.
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First seen 24 Jan 2026
If you are a PM
BeforeNow
Discovery looks at the agent's answerAlso study the tools the agent calls
A vendor demo shows what you getTest the vendor's agent in your own setup
Nobody owns the agent loopPick an owner for the agent loop
BeforeNow
The agent shows a thinking label
Who said it
Decoding AI Magazinedecodingai.com · 3 November 2026 · 3 posts
Harness Engineering Roadmap: Claude Code From First Principles…LangChain kept the same model and changed only the harness. Their coding agent went from 53% to 67% on Terminal-Bench, a top coding-agent benchmark. …
