Crate agent_proxy_rust_model_router 

Model routing and channel selection middleware.

Implements the selection strategy from specs/0003-channel-model.md Phase 1: FlatFee channels with quota > 0 and healthy are preferred; Metered channels serve as fallback. Health tracking uses a simple binary model with 60s cooldown.

Structs

ChannelState

Runtime health state for a channel, tracked in-memory.

ModelRouterMiddleware

Channel selection and model routing middleware.

PricingTier

A single tier in a Pricing::Tiered schedule.

QuotaUsage

Per-mapping monthly quota consumption tracker.

ResolvedChannel

Parsed in-memory representation of a channel with its model mappings.

ResolvedMapping

Parsed in-memory representation of a model mapping.

SelectedMappingInfo

Lightweight mapping info stored in the context extension.

Enums

BillingDimension

The billing dimension for metered and tiered pricing.

ChannelBilling

Billing mode for a channel mapping.

ChannelHealth

Binary health status for a channel.

ExhaustedAction

Action when a flat-fee channel’s quota is exhausted.

Pricing

Pricing formulas for cost calculation.

Quota

Usage quota for a flat-fee channel.

TierPrice

Per-unit price within a tier, discriminated by dimension type.

Functions

reload_channels_from_storage

Hot-reloads the in-memory channel list from storage and atomically swaps it into channels_swap.