Shumer Sparks Debate: Is Harness Engineering a Mistake?

Matt Shumer argued that custom harness engineering is usually foolish and that teams should use the model's native harness instead. His claim drew pushback from LangChain's CEO and others, sparking a broader debate over who should own the harness layer.

2026-10-31 ~ 2026-11-01 · 3 related posts

• Matt Shumer: harness engineering is usually stupid — use the harness the model was trained for — mattshumer_ · 2026-10-31
• Harness debate: it should be model-provider infrastructure, not your engineering — robleclerc · 2026-10-31
• Harness engineering debate: LangChain fires back at Matt Shumer's 'harness is stupid' take — hwchase17 · 2026-11-01