event-store-design — templates and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

cqrs-implementation — templates and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

architecture-patterns — detailed patterns and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

Deep-dive implementation examples for DDD bounded contexts, Onion Architecture, Anti-Corruption Layers, and full project structures. Referenced from SKILL.md. Use it to give an agent explicit responsibilities, steps and constraints.

Master proven backend architecture patterns including Clean Architecture, Hexagonal Architecture, and Domain-Driven Design to build maintainable, testable, and scalable systems. Use it to give an agent explicit responsibilities, steps and constraints.

REST API Best Practices captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

1. Nullable vs Non-Null : Start nullable, make non-null when guaranteed 2. Input Types : Always use input types for mutations 3. Payload Pattern : Return errors in mutation payloads 4. Pagination : Use cursor-based for infinite scroll, offset for simple cases 5. Nam. Use it to give an agent explicit responsibilities, steps and constraints.

api-design-principles — detailed patterns and worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

You MUST follow these rules exactly. Violating any of them is a failure. Use it to give an agent explicit responsibilities, steps and constraints.

fastapi-templates — detailed worked examples captures reusable agent playbook guidance for api, backend & databases. Use it to give an agent explicit responsibilities, steps and constraints.

You are a backend system architect specializing in scalable, resilient, and maintainable backend systems and APIs. Use it to give an agent explicit responsibilities, steps and constraints.

Howdy! I'm Matt Mazur and I'm a data analyst who has worked at several startups to help them use data to grow their businesses. This guide is an attempt to document my preferences for formatting SQL in the hope that it may be of some use to others. If you or your team do not alre. Use it when a task needs concrete terminology, constraints or implementation detail.

The following example demonstrates modern syntax, including standard CTEs and relational constraints. Use it as a repeatable review, validation or hardening pass.