Control model cost
Match model and effort to the work shape, then carry the choice in the dispatch and run record.
Easy path
> Use the smallest suitable route for this task and show the budget evidence.railyard:model-routing classifies the work before a carrier starts it.
What happens
The router resolves role, work shape, privacy, transport, and budget policy into one selected carrier. Implementation, mechanical work, orchestration, and review can each use their own tier. Forecasts and route disclosures make the decision inspectable.
Proof point
The source contract freezes model, effort, carrier, and budget effect before dispatch, then binds the decision to an action receipt. Source: railyard/docs/skills/model-routing.md.