What problem does it solve? Python programs often scatter environment reads, hand-parse transport data in handlers, and bury orchestration logic in runners or pipelines. This Skill enforces a strict wiring layer where config, routes, and the composition root are the only places environment access, transport ingress, and program assembly occur. ## Core Features & Use Cases - Config Construct: Defines a single frozen BaseSettings model with env_prefix, declared scalars, and SecretStr fields, replacing scattered os.environ reads and settings dicts. - Route Construct: Structures transport ingress functions that validate raw data into contract or foreign models, dispatch the innermost value to a verb, and serialize the reply, with no domain logic. - Composition Root: Provides the main() entrypoint pattern (sync and async with signal handling) that constructs config, instantiates clients, binds the consistency model, and registers routes. - Use Case: When writing a new service entrypoint, use this Skill to produce a main.py that reads environment once via BaseSettings, wires clients through bindings, and delegates all request handling to thin route functions. ## Quick Start Ask the assistant to write the config, route, and composition root for a Python service that consumes venue fill messages from a message bus.
