Skill UI

A comprehensive guide to integrating PayPal into applications, covering all aspects of the payment lifecycle. This skill covers client-side implementations using JavaScript SDK for Express Checkout, server-side API interactions (REST API) for order creation and capture, handling recurring billing via Subscriptions, managing asynchronous updates through IPN/Webhooks, and processing refunds and payouts. Ideal for building robust e-commerce payment gateways.

Runs automated visual regression tests via Percy, Chromatic, or BackstopJS to capture component or page screenshots, compare them against baselines, and flag unintended UI changes during feature updates or CI/CD runs.

This comprehensive guide assists developers in migrating their code and API calls when Perplexity updates its model generations or changes API parameters. It provides a clear map from legacy models (pplx-api) to the current Sonar family (sonar, sonar-pro), covering model name changes, base URL updates, parameter adjustments, and SDK upgrade steps. Use this guide whenever you encounter deprecation warnings or need to ensure compatibility with the latest Perplexity Sonar models.

This skill demonstrates the multi-model pattern for creating robust and clean API contracts using Pydantic. It guides the creation of separate models for creation requests (Create), updates (Update), responses (Response), and database documents (InDB), ensuring type safety and clear data validation for Python backends. It also covers best practices like handling camelCase aliases and optional fields.

Specializes in building modern, high-performance Rails 7+ web applications. Expertise includes optimizing Active Record queries (N+1 prevention), implementing partial page updates with Hotwire (Turbo Frames/Streams), handling real-time communication via Action Cable, and managing background jobs using Sidekiq. The process includes rigorous RSpec testing and database schema management.

Highlights React 19 idioms such as the new use() hook, server components, server actions, optimistic updates, suspense, error handling, and compound hooks to structure Next.js apps with streaming data, interactivity, and reusable hooks.

Runs a predefined suite of smoke tests to verify key application functionality, authentication, integrations, and system health after deployments, upgrades, or configuration updates.

Guides building Next.js Server Actions for App Router forms, mutations, and optimistic updates, covering useFormState/useFormStatus hooks, revalidation helpers, and post-submission redirects.

This skill provides a comprehensive, step-by-step guide for safely upgrading Expo SDK versions. It covers critical phases including pre-upgrade planning (reviewing release notes and breaking changes), dependency management, configuration migration (e.g., app.json), code updates for deprecated APIs, and comprehensive testing across both iOS and Android platforms. Essential for maintaining compatibility when moving to new major SDK releases.

Automates Vercel operations through Composio’s Rube MCP toolkit, covering deployment inspections, creation, env var updates, DNS, and project configuration via guided workflows.

This comprehensive guide provides a step-by-step workflow for safely upgrading a full-stack application deployed on Vercel. It covers migrating Vercel CLI versions, updating Node.js runtimes, and handling major Next.js framework version changes. The guide emphasizes breaking change detection, schema updates, and implementing robust preview testing and rollback strategies for a smooth deployment process.

Handles semantic version updates across Claude Code plugin metadata, marketplace catalog, and git tags whenever a bump or release request appears, keeping all distributed files consistent.