WRITING / TECHNICAL
A Router Is a Workflow, Not a Conditional
A model router is a named, versioned, tested subsystem with its own evals, shadow mode and rollback. Most agent stacks ship it as a ternary on a confidence score.
Most teams ship model routing as a one-line ternary on a confidence score—and then wonder why cost creeps, quality regresses, and nobody can explain what happened. A router is not a conditional; it is a named, versioned, tested subsystem with its own evals, shadow mode, and rollback posture.
Published November 1, 2025. Reading time: 9 min read. Author: Morgan Wilson.