Specx Foundation

specx Foundation

Use this skill when a service class needs an explicit base, or when a new class category may need a project-local foundation base. Read references/foundation.md before editing foundation-related code.

Workflow

1. Prefer packaged scoped bases from specx.core.foundation,

specx.delivery.foundation, and specx.infrastructure.foundation.

1. Do not create an empty src//foundation/ package.
2. Add a project-local foundation/ module only when current code needs a real

project-local base category or a stateful framework base that must not be shared globally, such as a SQLAlchemy declarative base.

1. Keep project-local foundation limited to base definitions: marker bases,

common external-base wrappers, justified ABCs, and stateful framework bases. Put stable cross-scope concrete primitives under shared/, not foundation/.

1. Give every project source class, including each local base, a docstring that

explains what it protects and includes a concrete usage example.

1. Make every non-foundation project source class inherit an explicit scoped

base.

1. Name each class with the suffix implied by its base ancestry, such as

TaskDTO, TaskEntity, TaskResponseSchema, CreateTaskUseCase, or TaskTitleNormalizerService.

1. Use BaseLifecycle for delivery app lifespan managers such as

FastAPILifecycle.

1. Prefer @dataclass(frozen=True, kw_only=True, slots=True) for commands,

queries, DTOs, entities, and other core data classes unless the user asks for another model type.

1. Keep BaseCommand and BaseQuery as use-case input bases, independent from

BaseDTO. Commands and queries are not result DTOs.

1. When an application value has a limited known set, model it with

BaseStrEnum instead of plain str or Literal[...].

1. Keep business rules, delivery behavior, adapter code, and runtime wiring out

of project-local foundation modules.

Code Style

Use blank lines as logical separators in all code. Keep related statements together, but separate independent setup, action, assertion, response, branch, and transformation groups so long blocks stay readable.

References

• references/foundation.md - packaged base catalog, import paths, extension

rules, and architecture guardrails.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: maksimzayats
• Source: maksimzayats/specx
• License: MIT
• Homepage: https://specx.dev

Install and usage instructions live in the source repository linked above.