The AI Agent Stack in 2026
Summary
The article describes how the AI agent landscape has evolved from a linear "stack" in 2025 to a more complex "operating system" model in 2026. This shift is driven by agents moving beyond simple chat windows into integrated interfaces like IDEs, the emergence of standalone coding harnesses, and the standardization of communication protocols like MCP. The resulting architecture organizes agents into layers of interfaces, runtimes, and knowledge, all governed by vertical rails of security and observability.
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This article originally appeared on The Nuanced Perspective.
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