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SkillsMP has collected 156 skills from majesticlabs-dev/majestic-marketplace. Open a skill to review its source and details.
majesticlabs-dev/majestic-marketplaceShowing 36 of 156 collected skills.
Expert guidance for creating syntactically correct Mermaid diagrams. Use when creating flowcharts, sequence diagrams, class diagrams, state diagrams, Gantt charts, ER diagrams, or data lineage visualizations.
Build Django applications with models, views, forms, templates, REST APIs, and modern Django 5.x patterns.
Build FastAPI applications with async patterns, Pydantic validation, dependency injection, and modern Python API practices.
Write pytest tests with fixtures, parametrization, mocking, async testing, and modern patterns. Use when creating or updating Python test files. Not for unittest — use standard library patterns instead.
Modern Python 3.12+ development with uv, ruff, and production-ready practices. Routes to specialized skills for frameworks and testing.
Use when creating or refactoring Action Mailer emails. Applies Rails 7.1+ conventions, parameterized mailers, preview workflows, background delivery, and email design best practices.
Use proactively for authorization with ActionPolicy. Creates policies, scopes, and integrates with GraphQL/ActionCable. Preferred over Pundit for composable, cacheable authorization.
Use when creating or refactoring Active Job background jobs. Applies Rails 8 conventions, Solid Queue patterns, error handling, retry strategies, and job design best practices.
Use when implementing real-time features requiring reliability, especially LLM streaming. Applies AnyCable patterns for message delivery guarantees, presence tracking, and Action Cable migration.
Use when building Avo admin interfaces. Creates resources, actions, filters, and dashboards following Avo conventions. Fetches latest docs dynamically.
Build production-quality Ruby gems. Use when creating new gems, structuring gem architecture, implementing configuration patterns, setting up testing, or preparing for publishing. Covers all gem types - libraries, CLI tools, Rails engines, and API clients.
Use when implementing Hotwire features with Turbo Drive, Turbo Frames, and Turbo Streams. Applies Rails 8 conventions, morphing, broadcasts, lazy loading, and real-time update patterns.
Design Rails applications using layered architecture. Use when analyzing codebases for architecture violations, planning feature implementations, deciding where code belongs, or extracting abstractions from fat models/controllers. Complements dhh-coder (which…
Write Minitest tests for Ruby and Rails applications. Use when creating test files, writing test cases, or testing new features. Not for RSpec — use rspec-coder instead. Covers both traditional and spec styles, fixtures, mocking, and Rails integration testing…
Use proactively when encountering Rails errors, test failures, build issues, or unexpected behavior. Analyzes errors, reproduces issues, and identifies root causes.
Write RSpec tests for Ruby and Rails applications. Use when creating spec files, writing test cases, or testing new features. Not for Minitest — use minitest-coder instead. Covers RSpec syntax, describe/context organization, subject/let patterns, fixtures,…
Use when configuring or working with Solid Cache for database-backed caching. Applies Rails 8 conventions, cache key design, expiration strategies, database setup, and performance tuning patterns.
Use when configuring or working with Solid Queue for background jobs. Applies Rails 8 conventions, database-backed job processing, concurrency settings, recurring jobs, and production deployment patterns.
Use when applying Tailwind CSS styling to Rails views. Uses utility classes, responsive design patterns, and integrates with Rails view helpers.
Write modern React components with TypeScript, hooks, and best practices. Creates functional components, custom hooks, and follows composition patterns.
Expert guidance on modern React patterns including hooks, composition, state management, and concurrent features. Use when implementing React components or refactoring existing code.
Guide for coordinating multiple Claude Code instances as a team using Agent Teams. Covers TeammateTool operations, spawn backends, communication, task coordination, hooks, and orchestration patterns. Use when building multi-agent workflows requiring…
Generate synthetic test data with edge cases for ETL pipeline testing.
Pytest templates and patterns for ETL pipeline testing - unit, integration, data quality.
Data validation patterns and pipeline helpers. Custom validation functions, schema evolution, and test assertions.
Detect anomalies in data using statistical and ML methods. Z-score, IQR, Isolation Forest, and time-series anomalies.
DataFrame schema validation using pandera. Schema definitions, column checks, and decorator-based validation.
Record-level data validation using Pydantic models. Field validators, model validators, and batch validation patterns.
Implement typed business operations with ActiveInteraction. Covers input types, composition, controller patterns, and testing.
Four common skill archetypes with structure templates - CLI reference, methodology, safety/security, and orchestration. Use when creating new skills to select appropriate structure.
Security patterns and checklists for reviewing Infrastructure-as-Code. Covers Terraform/OpenTofu state, secrets, network, compute, database, and storage security.
Add new field to .agents.yml config schema (updates init.md templates, version, migration)
Record domain events and dispatch to inbox handlers for side effects, audit trails, and activity feeds. Use when building activity logs, syncing external services, or decoupling event creation from processing. Triggers on event recording, audit trails,…
Build component-based UIs with ViewComponent and view_component-contrib. Use when creating reusable UI components, implementing slots and style variants, or building component previews. Triggers on ViewComponent creation, component patterns, Lookbook…
Wrap JSON-backed database columns with ActiveModel-like classes using store_model. Use when creating configuration objects, managing nested JSON attributes, or adding validations to JSON data. Triggers on JSON columns, store_model, typed JSON, configuration…
Build modern SPAs with Inertia.js and Rails using React, Vue, or Svelte. Use when creating Inertia pages, handling forms with useForm, managing shared props, or implementing client-side routing. Triggers on Inertia.js setup, SPA development, or…