Crate mcp_usage_export 

Buffered usage accounting for MCP calls.

Recording is synchronous, memory-only, and never performs network I/O. A separate BillingPipeline::flush drains aggregates into an exporter. If an export fails, the exact same event identifiers and quantities are retained for retry, which makes ambiguous provider failures safe.

Structs

AggregatedUsage

One pre-aggregated provider event ready for export.

BillingPipeline

Coordinates a UsageBuffer with an off-path exporter.

CompositeExporter

Fan-out exporter for logs, billing, analytics, and audit sinks.

FnExporter

Adapter for an application-owned async export function.

LogExporter

Stateless exporter that emits structured log events.

MeterEventDeadLetter

A meter event that needs application-owned reconciliation.

MeterEventExporter

Exports pre-aggregated usage through an application-supplied provider.

MeterEventProviderError

Sanitized batch-wide provider failure without per-event outcomes.

NoopRecorder

Shared, no-op recorder for deployments that want attribution metrics only.

UsageBuffer

Thread-safe in-memory aggregator with bounded idempotency memory.

UsageEvent

One delivered unit event emitted by the request path.

Enums

ExportError

Provider export failure.

MeterEventDeadLetterReason

Why a meter event was quarantined for reconciliation.

MeterEventOutcome

The provider’s final or retryable disposition for one meter event.

RecordError

Recording failures are internal synchronization failures only.

RecordOutcome

Result of attempting to record an event.

Traits

BatchExporter

Exports a prepared batch away from the request path.

MeterEventProvider

Submits ordered batches of pre-aggregated usage to a billing provider.

UsageRecorder

A synchronous usage sink suitable for the HTTP hot path.

Type Aliases

ExportFuture

Boxed future returned by object-safe billing exporters.

MeterEventProviderFuture

Boxed future returned by a meter event provider.

SharedExporter

Convenient trait-object alias for composing exporters at runtime.

SharedRecorder

Convenient trait-object alias used by the edge layer.