Development

Stack

The initial implementation uses Python 3.12 and the standard library. The first slice intentionally avoids runtime dependencies so the repository can be tested immediately in local and agent environments.

Layout

src/user_engine/
  adapters/    local standalone adapters and deterministic test doubles
  domain/      transport- and persistence-neutral domain schemas
  errors.py    typed service exceptions for callers and future transports
  ports.py     adapter protocols for identity, authorization, events, audit,
               membership export, application bindings, and secrets
  service.py   headless service API for the isolated MVP
  testing/     local fixtures for tests and examples
tests/         standard-library unittest suite

The domain layer should not import HTTP frameworks, database clients, or platform-specific SDKs. Those integrations belong behind ports.

Commands

make test

The command runs:

PYTHONPATH=src python3 -m unittest discover -s tests -p 'test_*.py'

Implementation Rule

Add new behavior in this order:

domain schema or port;
local fixture or adapter;
test that proves the boundary;
infrastructure adapter or API surface.

Isolated MVP Surface

The initial headless API is UserEngineService. It exposes health, readiness, me, user/account lifecycle, identity linking, application registration, catalog publication, profile writes, effective profile resolution, projections, audit inspection, and outbox inspection. The first store is InMemoryUserEngineStore, which carries an explicit schema version and migration hook so later database-backed stores have a contract to match.

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