Carter

Routing an agent means deciding who plans, who executes, what context they share, and when to switch—not merely choosing the cheapest model for a prompt.

• Which tasks justify the expensive model?
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• Keep frontier judgment, delegate the implementation
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• The task changes while the agent is working
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• Cheap tokens can produce an expensive task
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• A sidekick keeps its own running context
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• Routing can happen inside a model artifact
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• Remember where the evidence lives
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• Cache-aware routing meets the always-running agent
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• Local capacity and shorter context change the calculation
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• Use supervision opportunities to detect trouble
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• Measure confusion, then inspect the trace
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• Learn from the routing decisions users correct
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• What remains when models become better collaborators?
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