Development & Testing Skills

A daily checklist for writing clean Rails code, covering design principles (DRY, YAGNI, PORO, CoC, KISS), per-path rules (models, services, workers, controllers),…

Use when writing new Rails code for a project using the PostgreSQL + Hotwire + Tailwind CSS stack.

Orchestrates robust background job implementation: design job → TDD implementation → configure retry/discard strategies → test failure scenarios → production monitoring. Use when adding async processing, implementing background jobs, or configuring job queues. Trigger: background job, async processing, sidekiq, solid queue, active job, job queue, worker.

Use when creating, scaffolding, or refactoring a Rails engine.

Use when creating install generators, copied migrations, or initializer installers for Rails engines.

Use when writing or maintaining documentation for Rails engines.

Complete Rails engine development loop. Orchestrates scaffolding engine structure and generating mountable namespaces → testing → code review and dependency auditing → release. Use when creating, extracting, or maintaining Rails engines. Trigger: create engine, extract engine, engine release, engine testing, mountable engine, gem extraction.

Use when extracting existing Rails app code into a reusable engine.

Use when creating or modifying REST API endpoints (Rails controllers, engine routes, API actions).

Implement and test authorization in Rails applications using Pundit or CanCanCan.

Use when adding or reviewing background jobs in Rails.

Use when building or reviewing GraphQL APIs in Rails with the graphql-ruby gem.

Creates Stimulus controllers, configures Turbo Frame lazy loading, sets up Turbo Stream broadcasts, and converts traditional Rails views to Hotwire patterns for…

Load a saved conversation context to resume previous work. Supports local files, git repos, and URLs. Triggered by 'load context', 'resume previous work', 'pick up where I left off', 'load saved session', 'reload context'.

Optimizes Rails application performance.

Use when choosing the best first failing RSpec spec or vertical slice for a Ruby on Rails change.

Use when preparing a Rails engine gem release.

Reviews an architecture (file, repo, design doc, or pasted text) against scalability, security, reliability, compliance, and anti-pattern checklists plus fitness functions. Use when the user asks to "review my architecture", "critique this design", "audit this system", or invokes /sdd:review-architecture.

Use when reviewing a Rails engine, mountable engine, or Railtie.

Use when planning or reviewing production database migrations, adding columns, indexes, constraints, backfills, renames, table rewrites, or concurrent operations.

Manage development and test data in Rails.

Use when creating or improving RSpec test coverage for Rails engines.

Use when writing RSpec tests for service objects, API clients, orchestrators, or business logic in spec/services/.

Use when making a Rails engine stable across Rails and Ruby versions.