# ADR 001: Use Python gRPC for Auth

## Status

Accepted.

## Context

The assessment requires Python with gRPC and focuses on microservice communication.

## Decision

Implement the authentication boundary as an async `grpc.aio` service with protobuf contracts.

## Consequences

Service-to-service calls are strongly typed and efficient. Browser interaction needs a separate demo client service because native browser gRPC is not practical without grpc-web or a proxy.