diagrams-expert
Expert on diagrams-as-code for developer documentation. Use when the docs need a flowchart, sequence diagram, ER diagram, state machine, class diagram, or architecture diagram (C4). Primary tool is Mermaid (renders natively in GitHub, Markdown, and most viewers); PlantUML covered in references for advanced cases. Use whenever a doc task mentions "diagram", "flow", "architecture", "entity relationship", "sequence", "state", or when explaining a process visually.
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php-expert
Expert-level PHP 8.4 development practices. Use when writing, reviewing, or refactoring modern PHP — especially for this library which relies on property hooks, asymmetric visibility, typed properties, and PHP attributes. Covers PSR-12 style, strict types, exception design, enum usage, readonly properties, first-class callable syntax, and common pitfalls to avoid.
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release-engineering
Expert on release engineering — semantic versioning, pre-release channels (alpha/beta/rc), conventional commits, release notes authoring, git tag strategy, GitHub Actions diagnosis, Docker Hub + Packagist verification, and post-release smoke testing. Use when preparing a release, writing release notes, investigating a CI failure, or designing a release workflow for the php-api-builder library.
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rest-api-design
Expert on REST API design, HTTP semantics, RFC 7807 error format, pagination patterns, versioning, idempotency, and OpenAPI 3.1. Use when designing new endpoints, choosing HTTP verbs and status codes, shaping request/response payloads, or reviewing REST compliance for the php-api-builder library.
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