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Introspect and analyze software architectures using first principles thinking, SpaceX's 5-step engineering methodology (Question, Delete, Simplify, Accelerate, Automate), and software modularity principles. This skill should be used when analyzing existing architectures, evaluating architectural decisions, identifying technical debt, planning refactoring efforts, or assessing whether architectural patterns are justified.

Write effective TableTest-style tests for data-driven testing in JUnit using either Java or Kotlin. The table format makes tests more readable, maintainable, and collaborative - treating test data as first-class documentation of system behaviour. Use it when testing the same logic with multiple input/output combinations, when you have 2+ similar test methods differing only in data values, when business rules involve multiple cases/examples, or when adding new test cases should be as simple as adding a table row. Use standard JUnit @Test when testing a single scenario, when test logic differs significantly between cases, when complex setup/teardown varies per test, or when mocking behaviour differs per test case.

Business and systems analyst for Rails projects. Use when decomposing features into tasks, estimating complexity, describing architecture, writing JTBD (Jobs To Be Done), creating use cases, identifying risks, analyzing project weaknesses, and planning product features.

Writes and edits content in Ben Swift's distinctive voice for any type of writing including blog posts, emails, technical documentation, and academic content. Use when the user wants writing in Ben's voice or style.

Create exceptional, publication-quality Mermaid diagrams for ERDs, flowcharts, sequence diagrams, and system visualizations. Use this skill when the user needs to visualize data models, processes, or architecture. Generates clear, refined diagrams that communicate complex systems with precision.

Scans GitHub commit history for commits that might make good TIL blog posts. Queries all your repos across all orgs via GitHub API. Tracks assessed commits in Notion to avoid duplicates across machines. Use when user asks for TIL ideas from their recent work.

Drafts a TIL blog post in the user's voice and creates it in Notion with Status="Claude Draft". Contains voice guide for matching the user's writing style. Use when user approves a TIL topic and wants a draft created.

Structure LLM context using XML tags for maximum attention efficiency. Use when writing system prompts, organizing complex instructions, or engineering context for Claude agents. Produces semantically meaningful XML that creates clear attention anchors.

REST API specialist for Rails applications. Use when building API endpoints, implementing serialization, API versioning, JWT authentication, or creating API documentation. Focuses on RESTful design, performance, and consistency.

Use when user asks to explain, break down, or help understand technical concepts (AI, ML, or other technical topics). Makes complex ideas accessible through plain English and narrative structure.

Specialized skill for building ViewComponents with Hotwire (Turbo & Stimulus). Use when creating reusable UI components, implementing frontend interactions, building Turbo Frames/Streams, or writing Stimulus controllers. Includes component testing with Lookbook.

Create performative ASCII art to explain code concepts with visual impact. Use this skill when the user asks to visualize algorithms, data structures, architecture, control flow, or any code concept that benefits from spatial representation. Generates memorable, educational ASCII diagrams.

Fetches and processes GitHub pull requests waiting for review. Returns fully formatted markdown with PRs grouped by category (Feature/Bug, Chores, Dependency Updates) and sorted by age. Includes metadata like CI status, review status, size metrics, and viewing history. Use when user wants to see their PR review queue.

Manages ML experiment tracking with MLflow, Weights & Biases, or SpecWeave's built-in tracking. Activates for "track experiments", "MLflow", "wandb", "experiment logging", "compare experiments", "hyperparameter tracking". Automatically configures tracking tools to log to SpecWeave increment folders, ensuring all experiments are documented and reproducible. Integrates with SpecWeave's living docs for persistent experiment knowledge.

Prepares Pine Scripts for publication in TradingView's community library with proper documentation and compliance. Use when preparing to publish, adding documentation, ensuring House Rules compliance, writing descriptions, or finalizing scripts for release. Triggers on "publish", "release", "documentation", "House Rules", or preparation requests.

Execute implementation tasks from design documents using markdown checkboxes. Use when (1) implementing features from feature-design-assistant output, (2) resuming interrupted work, (3) batch executing tasks. Triggers on 'start implementation', 'run tasks', 'resume'.

Testing philosophy and practices. This skill should be used when writing tests, designing test strategies, or reviewing test code. Use proactively when discussing TDD, red-green-refactor, test doubles, mocks, stubs, fakes, RSpec, Jest, pytest, unit tests, integration tests, test coverage, or test-first development. (user)

Expert in creating Mermaid diagrams following C4 Model and SpecWeave conventions. Specializes in system architecture, sequence diagrams, ER diagrams, and deployment diagrams. Activates for diagram creation, architecture visualization, data modeling, sequence flows, C4 diagrams, HLD, LLD.

Expert PM validation for increment closure with 3-gate quality checks (tasks, tests, documentation). Acts as final quality gate before closing increments. Validates task completion, test coverage, documentation updates, and detects scope creep. Activates for /done command, increment closure, close increment, validate increment, completion check, quality gate, PM approval, ready to close, scope creep detection, release validation, increment validation.

Docusaurus documentation expert. Specializes in creating, configuring, and deploying Docusaurus documentation sites, MDX authoring, plugin development, theming, versioning, and i18n. Activates for Docusaurus, documentation site, docs, MDX, markdown docs, static site generator, documentation framework, Docusaurus plugins, Docusaurus themes.