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Aishwarya Srinivasan (Substack)

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2026-08-24

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2026-08-24 / VOICESAishwarya Srinivasan maps harness engineering into three layers and puts the enterprise agent production rate at 5%Her August 23 piece credits Mitchell Hashimoto with popularizing 'Agent = Model + Harness' and cites that only about 5% of enterprise AI agents ever reach production, with the other 95% dying in prototype after demoing well. She breaks a production harness into three layers answering three questions: what does the model see (context and orchestration), what can the model do (tools, permissions, the governance boundary), and how do we know it did the right thing. She ties layer two to OWASP's 'excessive agency' risk, where over-provisioned functions and missing approval steps do the real damage.

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