Workflow-driven skill that builds gRPC streaming-RPC test suites from a proto definition. Classifies each RPC by pattern (unary, server-streaming, client-streaming, bidi), then emits the required categories per pattern - ordering preservation, completion semantics (server close after stream end, client half-close), cancellation, deadline handling, partial-stream failure. Produces skeletons for Go (bufconn + Send/Recv), Python (iterators), JVM (StreamObserver), Node (call.write/end). Use when adding tests for a new streaming RPC or auditing a suite for uncovered categories. Different test surface from grpc-interceptor-test-author (interceptor layer) and grpc-mock (harness); for wire-level streaming semantics use grpc-streaming-tests, not this.