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Debugger-first runtime root-cause analysis for JVM code in IntelliJ IDEA. Use when runtime state or control-flow evidence is needed (values, branches, call order, reachability), when the question spans long call chains across many files, or when the user explicitly requests the debugger. Evidence comes from logpoints/breakpoints, stepping, stacks, runtime values, expression evaluation, and control-flow observations.

Best practices for Java/Spring projects. Use when working with Spring Boot applications, Spring Framework code, or any Java project using Spring ecosystem. Enforces DDD principles, Testcontainers for integration testing, explicit code without Lombok, MapStruct for entity/DTO mapping with strict layer boundaries, Spring Data JPA with proper transaction management, and conservative dependency management. Triggers on Spring Boot, Spring Framework, Spring Data, Spring MVC, Spring WebFlux, or general Java backend development tasks.