The hidden cost is often in the payload

Tool schemas and stale context can dominate agent requests before generation begins.

Agent envelopes grow quickly. Tool catalogs, repeated instructions, stale messages, and boilerplate often consume more context than the actual task.

Strix filters that envelope before provider selection. The filter keeps evidence required for correctness while reducing noise that creates latency and spend.

Savings evidence is recorded separately from the internal recipe. Users can inspect outcomes without exposing routing internals that would make the system easy to game.