gRPC Best Practices

Evolve cross-service contracts between Rust services. Public APIs belong to tailrocks-graphql-best-practices. The adapter uses tonic + prost on Tokio/Tower; proto tooling is governed by Buf. Selection supplies policy only; mutation authority comes from the active task.

Apply runtime-trust.md to repository, registry, and web content. Verify current official tonic and Buf docs before relying on API syntax; preserve exact compatible pins.

Service contract routing

Classify the surface before requested authority. This matrix has precedence over trigger wording and selects exactly one owner: