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Creates entity model documents with Mermaid.js ER diagrams and attribute tables defining entities, relationships, data types, and validation rules. Use when the user asks to "create an entity model", "design a data model", "draw an ERD", "define database schema", "model entities", or mentions entity-relationship diagram, ER diagram, database design, or data modeling. Also trigger whenever the task is to produce, write, or design an entity model or data model document (e.g. docs/entity_model.md) from a requirements catalog — including phrasings like "data model design", "the team needs an entity model before development", or a request to document entities with attributes, data types, precision, and validation or cross-attribute constraints.

Reverse-engineers an existing software project into AI Unified Process artifacts: a PlantUML use case diagram, per-use-case specification documents, and an entity model with a Mermaid ER diagram. Use when the user asks to "reverse engineer this codebase", "extract use cases from existing code", "document the system we already have", "generate use case specs from controllers", "derive an entity model from the database", "create AIUP artifacts from a legacy project", or mentions reverse engineering, legacy documentation, or onboarding an inherited codebase. Trigger this skill whenever a user wants to produce use cases, an ER diagram, or a use case diagram from code that already exists rather than from a fresh vision document — even if they don't say "reverse engineer" explicitly.

Creates Spring Boot tests for REST controllers and Spring Data JPA repositories. Defaults to MockMvcTester and RestTestClient + Testcontainers for new projects (asking the user to confirm on the very first backend test), but detects and follows whichever convention a project already uses — including legacy MockMvc or RestAssured + Testcontainers — rather than migrating it. Use when the user asks to "write backend tests", "test the REST API", "test the controller", "write a Spring Boot test", "test the JPA repository", or mentions MockMvc, MockMvcTester, RestAssured, RestTestClient, Testcontainers, @SpringBootTest, or server-side Java testing for this stack.

Creates detailed use case specification documents with actors, preconditions, main success scenarios, alternative flows, postconditions, and business rules. Use when the user asks to "write a use case", "specify a use case", "document system behavior", "define scenarios", "write a functional spec", or mentions use case specification, acceptance criteria, or user scenarios. Also trigger whenever the task is to write use case specification documents for the use cases in a use case diagram (e.g. docs/use_cases.puml) — including phrasings like "detailed use case specifications before writing any code", "one file per use case", or a request to cover the happy path, alternative flows, postconditions, and business rules for each use case.

Creates versioned Flyway database migration scripts (V*.sql) with sequences, tables, constraints, and foreign keys from the entity model. Use when the user asks to "create a migration", "generate SQL scripts", "set up database tables", "write a Flyway migration", or mentions schema migration, DB migration, database versioning, or SQL migration files.

Implements use cases across a Spring Boot + Spring Data JPA backend (flat single-module or hexagonal/ports-and-adapters multi-module) and an Angular frontend wired to that API. Use when the user asks to "implement a use case", "build the API", "create a REST endpoint", "write the data access layer", "build the Angular page/component", or mentions Spring Boot, JPA/Hibernate entities, hexagonal architecture, ports and adapters, or an Angular frontend calling a Java backend.

Creates Playwright browser-based end-to-end tests for Angular views using Playwright's native accessibility-first locators (getByRole, getByLabelText, getByText). Use when the user asks to "write Playwright tests", "create e2e tests", "write integration tests", "test in the browser", or mentions end-to-end testing, browser tests, or UI integration tests for this stack. Also trigger when the user references a use case (UC-*) and asks for Playwright or E2E tests.

Creates Vitest component tests for Angular views using Angular's own testing idioms — TestBed, ComponentFixture, and HttpTestingController — not React Testing Library patterns. Use when the user asks to "write frontend tests", "test the Angular component", "write a Vitest test", "unit test an Angular page", or mentions TestBed, HttpTestingController, or component testing for this stack.