Pure billing-attribution semantics for MCP 2026-07-28. This crate performs no I/O, starts no tasks, and has no transport dependency. It classifies terminal delivery, MRTR continuations, durable tasks, errors, cache delivery, quotas, and spend caps.
Most applications should depend on the mcp-usage-kit facade. Use this crate
directly when you need only the deterministic protocol and pricing engine.
| API documentation | Conformance vectors |
Licensed under Apache-2.0.