specx-add-core-use-case: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Add or refactor a specx core scope use case. Use when implementing an externally meaningful application action under a core scope use_cases package, adding same-file command/query inputs, result DTOs, coordinating services, opening a unit-of-work transaction, or moving behavior out of delivery or infrastructure into class-based application code.

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specx Add Core Use Case

Use this skill for one application action at a time. Read references/use-case.md before writing the use case.

Workflow

Name the action directly, for example CreateInvoiceUseCase.
Put it under core/<scope>/use_cases/<action>.py.
Inherit BaseUseCase from specx.core.foundation.use_case.
Define exactly one same-file input class: a Command for state-changing use cases or a Query for read-only use cases. Even empty inputs are explicit.
Make commands inherit specx.core.foundation.command.BaseCommand, queries inherit specx.core.foundation.query.BaseQuery, and result DTOs inherit specx.core.foundation.dto.BaseDTO. Prefer @dataclass(frozen=True, kw_only=True, slots=True) for all of these core data classes unless the user asks for another model type.
Treat commands and queries as input contracts, not DTOs. Do not make commands or queries inherit BaseDTO, put them under dtos/, or add a DTO suffix.
execute(...) accepts exactly one keyword-only argument named command or query and returns DTOs, not entities.
Inject services, capabilities, gateways, and UoW managers with Injected[...]. Keep infrastructure/runtime settings out of core use cases; expose required business policy as a typed core value or collaborator. For transactional persistence, inject the scope UnitOfWorkManager and open the active unit of work inside execute(...). Do not inject repositories, SQLAlchemy sessions/engines/session factories, or concrete infrastructure adapters directly into use cases.
Keep framework schemas, routers, ORM models, Redis clients, HTTP clients, and entity return types out of the use case.
Mark secret-bearing dataclass fields with field(repr=False) and never log whole commands, queries, or DTOs that may contain sensitive values.
Add or update flat unit tests for the behavior. The test receives the native pytest container fixture, registers local doubles or inline mocks before resolution, and resolves the use case with container.resolve(UseCaseClass). If the use case injects a UnitOfWorkManager, also add a core integration test under tests/integration/core/... against the real persistence graph (and the transactional database graph when database-backed).

CheckReadinessUseCase may live under core/health when readiness checks any required external dependency or multiple delivery layers reuse the policy. Add a core CheckLivenessUseCase only when framework-independent liveness policy is genuinely reused across deliveries; keep a simple process-only liveness response in delivery. HTTP paths, status codes, headers, and schemas always stay in delivery.

Transaction Rule

A use case may open one unit-of-work scope inside execute(...) when database work is part of the action. Inject the manager, not Provider[UnitOfWork] and not an active UoW instance, repository, SQLAlchemy session/engine/session factory, or concrete infrastructure adapter. Read/effect services may receive the active unit_of_work, but services do not open transactions. Repository calls from a use case stay rooted in the manager-owned unit_of_work variable.

Commands are allowed to change state. Queries are read-only and should not call repository mutators such as add, save, create, update, or delete, or invoke gateways with external write effects.

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/use-case.md - use-case class shape, DTO examples, UoW examples, and test guidance.

View source ↗

File metadata

name: specx-add-core-use-case
description: Add or refactor a specx core scope use case. Use when implementing an externally meaningful application action under a core scope use_cases package, adding same-file command/query inputs, result DTOs, coordinating services, opening a unit-of-work transaction, or moving behavior out of delivery or infrastructure into class-based application code.

View original text

---
name: specx-add-core-use-case
description: Add or refactor a specx core scope use case. Use when implementing an externally meaningful application action under a core scope use_cases package, adding same-file command/query inputs, result DTOs, coordinating services, opening a unit-of-work transaction, or moving behavior out of delivery or infrastructure into class-based application code.
---

# specx Add Core Use Case

Use this skill for one application action at a time. Read
`references/use-case.md` before writing the use case.

## Workflow

1. Name the action directly, for example `CreateInvoiceUseCase`.
2. Put it under `core/<scope>/use_cases/<action>.py`.
3. Inherit `BaseUseCase` from `specx.core.foundation.use_case`.
4. Define exactly one same-file input class: a `Command` for state-changing
use cases or a `Query` for read-only use cases. Even empty inputs are
explicit.
5. Make commands inherit `specx.core.foundation.command.BaseCommand`, queries inherit
`specx.core.foundation.query.BaseQuery`, and result DTOs inherit
`specx.core.foundation.dto.BaseDTO`. Prefer
`@dataclass(frozen=True, kw_only=True, slots=True)` for all of these core
data classes unless the user asks for another model type.
6. Treat commands and queries as input contracts, not DTOs. Do not make
commands or queries inherit `BaseDTO`, put them under `dtos/`, or add a
`DTO` suffix.
7. `execute(...)` accepts exactly one keyword-only argument named `command` or
`query` and returns DTOs, not entities.
8. Inject services, capabilities, gateways, and UoW managers with
`Injected[...]`. Keep infrastructure/runtime settings out of core use cases;
expose required business policy as a typed core value or collaborator. For
transactional persistence, inject the scope
`UnitOfWorkManager` and open the active unit of work inside `execute(...)`.
Do not inject repositories, SQLAlchemy sessions/engines/session factories,
or concrete infrastructure adapters directly into use cases.
9. Keep framework schemas, routers, ORM models, Redis clients, HTTP clients,
and entity return types
out of the use case.
10. Mark secret-bearing dataclass fields with `field(repr=False)` and never log
whole commands, queries, or DTOs that may contain sensitive values.
11. Add or update flat unit tests for the behavior. The test receives the
native pytest `container` fixture, registers local doubles or inline mocks
before resolution, and resolves the use case with
`container.resolve(UseCaseClass)`. If the use case injects a
`UnitOfWorkManager`, also add a core integration test under
`tests/integration/core/...` against the real persistence graph (and the
transactional database graph when database-backed).

`CheckReadinessUseCase` may live under `core/health` when readiness checks any
required external dependency or multiple delivery layers reuse the policy. Add
a core `CheckLivenessUseCase` only when framework-independent liveness policy
is genuinely reused across deliveries; keep a simple process-only liveness
response in delivery. HTTP paths, status codes, headers, and schemas always
stay in delivery.

## Transaction Rule

A use case may open one unit-of-work scope inside `execute(...)` when database
work is part of the action. Inject the manager, not `Provider[UnitOfWork]` and
not an active UoW instance, repository, SQLAlchemy session/engine/session
factory, or concrete infrastructure adapter. Read/effect services may receive
the active `unit_of_work`, but services do not open transactions. Repository
calls from a use case stay rooted in the manager-owned `unit_of_work` variable.

Commands are allowed to change state. Queries are read-only and should not call
repository mutators such as `add`, `save`, `create`, `update`, or `delete`, or
invoke gateways with external write effects.

## 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/use-case.md` - use-case class shape, DTO examples, UoW examples,
and test guidance.

Review the source

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Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Stars/forks activity: 201 stars, 35 forks; issue activity unavailable in current metadata
Dependency/runtime risk: credential or environment access, external package install surface
Permission surface: secrets or environment access, shell or command execution

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Source & usage notes

Indexed

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Source repository: maksimzayats/specx
License: MIT
Version: 1.0.0
Last GitHub push: Aug 8, 2026
Registry updated: Sep 3, 2026
Instruction path: .agents/skills/specx-add-core-use-case/SKILL.md @ 9362406cb839

Version reported in registry metadata; check source releases before relying on it.

Quality

67/100

Promising

Trust

63/100

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