# description
Per-route, per-tier, and per-tenant cost ceilings consumed by services/backend/shared/spend (Go) + services/ai/core/spend (Python). The runtime gate consults these maps before every LLM dial — see ADR-088.

# properties.routes.description
Per-route single-turn ceilings. `default` is required — every unlisted route inherits it.

# properties.tiers.description
BYOK role taxonomy (free | byok | admin-override). Sets the per-window ceiling.

# properties.tenants.description
Per-tenant overrides keyed by tenant_id. Empty in OSS dev.