Design

Use when building comprehensive monitoring and observability systems.

Use when oTP behaviors including gen_server for stateful processes, gen_statem for state machines, supervisors for fault tolerance, gen_event for event handling, and building robust, production-ready Erlang applications with proven patterns.

Use when designing or reviewing a backend MVP with tight budget, evolving schema, and reliance on third-party backends where idempotency, replay, and responsibility attribution are high-risk.

Use when FastAPI validation with Pydantic models. Use when building type-safe APIs with robust request/response validation.

Use when domain-specific language design in Kotlin using type-safe builders, infix functions, operator overloading, lambdas with receivers, and patterns for creating expressive, readable DSLs for configuration and domain modeling.

Build and train neural networks with TensorFlow

Use when designing modules and components requiring Composition Over Inheritance, Law of Demeter, Tell Don't Ask, and Encapsulation principles that transcend programming paradigms.

This skill should be used when planning and tracking complex feature implementations that require systematic task decomposition. Use this skill to break down large features into manageable, well-documented tasks with clear dependencies, action items, and success criteria. The skill provides a structured template and methodology for iterative planning and tracking throughout implementation.

Use when configuring Credo static analysis for Elixir projects requiring customized code quality rules and settings.

Use when Elixir Ecto patterns including schemas, changesets, queries, and transactions. Use when building database-driven Elixir applications.

Use automatically during development workflows when making claims about tests, builds, verification, or code quality requiring concrete evidence to ensure trust through transparency.

Use when Elixir OTP patterns including GenServer, Supervisor, Agent, and Task. Use when building concurrent, fault-tolerant Elixir applications.

Use when Java concurrency with ExecutorService, CompletableFuture, and virtual threads. Use when building concurrent applications.

Use when ruboCop cops including built-in cops, configuration, auto-correction, and development.

Expert guidance for using the GitLab CLI (glab) to manage GitLab issues, merge requests, CI/CD pipelines, repositories, and other GitLab operations from the command line. Use this skill when the user needs to interact with GitLab resources or perform GitLab workflows.

Use when creating or modifying GitHub Actions workflow files. Provides guidance on workflow syntax, triggers, jobs, steps, and expressions for creating valid GitHub Actions workflows that can be tested locally with act.

Use when applying encapsulation and information hiding principles in object-oriented design. Use when controlling access to object state and behavior.

Use when querying data with Ecto.Query DSL including where clauses, joins, aggregates, preloading, and query composition. Use for building flexible database queries in Elixir applications.

Use when setting up or configuring Storybook for a project. Covers main configuration, addons, builders, and framework-specific setup.

Use when nim-C interoperability including calling C from Nim, wrapping C libraries, importc/exportc pragmas, header generation, FFI patterns, and building high-performance systems code integrating Nim with existing C codebases.