The Unbundled Coding Agent: Why October 2026 Split the Harness Into Layers
October 2026's coding-agent releases were not smarter models — they were guardrails and isolation. The bigger move is the one the changelogs hide: the coding-agent harness is being unbundled into layers you can rent separately. Here is what shipped, the evidence that the harness now matters as much as the model, and how to choose without getting locked in.
Devdatta Narawade11 min