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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.

Technical documentation specialist for Rails projects. Use when writing README files, API documentation, setup guides, architectural decisions, code comments, or user-facing documentation. Focuses on clarity, completeness, and maintainability.

Comprehensive testing patterns for React components with MSW, React Query, and Vitest. Use when writing tests, setting up mocks, testing API interactions, or ensuring 80% coverage. Keywords - testing, MSW, React Query, Vitest, mocks, coverage, API testing.

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.

[UNDER DEVELOPMENT - DO NOT USE] Searches the Notion Writing database for unpublished items that could become TIL posts. This skill is not yet integrated with the publishing workflow.

Search for relevant code snippets, examples, and documentation from billions of GitHub repositories, documentation pages, and Stack Overflow posts. Use this skill when coding tasks require real working code examples, API usage patterns, framework setup instructions, or library implementation details to eliminate hallucinations and provide accurate, token-efficient context.

Archives completed changes and merges specification deltas into living documentation. Use when changes are deployed, ready to archive, or specs need updating after implementation. Triggers include "archive change", "merge specs", "complete proposal", "update documentation", "finalize spec", "mark as done".

Skill professionnel pour Claude Code permettant d'accéder, télécharger et analyser les données ouvertes françaises via data.gouv.fr. Inclut une librairie Python complète, des exemples de code, et une documentation détaillée des datasets les plus utilisés.

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.

Creates Salesforce architecture diagrams using Mermaid with ASCII fallback. Use when visualizing OAuth flows, data models (ERDs), integration sequences, system landscapes, role hierarchies, or Agentforce agent architectures.

Expert knowledge of SpecWeave framework structure, rules, conventions, and increment lifecycle. Deep understanding of source-of-truth discipline, increment naming, living docs sync. Covers SpecWeave-specific hooks (post-task-completion), and increment discipline. Activates for specweave rules, increment lifecycle, source of truth, increment naming, tasks.md format, spec.md structure, living docs sync, specweave hooks, where do files go, how to use specweave, specweave best practices, specweave conventions.

Generates comprehensive specifications (spec.md, plan.md, tasks.md with embedded tests) for SpecWeave increments using proven templates and flexible structure. Activates when users create new increments, plan features, or need structured documentation. Keywords: specification, spec, plan, tasks, tests, increment planning, feature planning, requirements.

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)