Why Your AI Agent Harness Matters More Than the Model
The AI agent harness — the orchestration layer, error handling, memory, and tool infrastructure surrounding the model — determines 77% of production outcomes, according to an analysis of 1,781 deployments aggregated by LangChain and Gartner between 2024 and 2025. The model itself accounts for the remaining 23%. Switching from GPT-4 to Claude without auditing your infrastructure is like replacing the engine without touching the transmission: the problem was never where you were looking.
faster incident resolution for companies with documented harness and active observability (Anthropic Engineering Blog, 200+ enterprise deployments, 2025)
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