Types
Type checking and type generation
karpenter
by cosmix
Kubernetes node autoscaling and cost optimization with Karpenter. Use when implementing node provisioning, spot instance management, cluster right-sizing, node consolidation, or reducing compute costs. Covers NodePool configuration, EC2NodeClass setup, disruption budgets, spot/on-demand mix strategies, multi-architecture support, and capacity-type selection.
error-handling
by cosmix
Comprehensive error handling patterns and strategies including Rust Result/Option, API error responses, data pipeline error handling, and security-aware error handling. Use when implementing exception handling, error recovery, retry logic, circuit breakers, fallback mechanisms, graceful degradation, or designing error hierarchies. Triggers: error, exception, try, catch, throw, raise, Result, Option, panic, recover, retry, fallback, graceful degradation, circuit breaker, error boundary, 500, 4xx, 5xx, thiserror, anyhow, RFC 7807, error propagation, error messages, stack trace.
auth
by cosmix
Authentication and authorization patterns including OAuth2, JWT, RBAC/ABAC, session management, API keys, password hashing, and MFA. USE WHEN: Implementing login flows, access control, identity management, tokens, permissions, session handling, API key authentication, or MFA. DO NOT USE: For security vulnerability scanning (use /security-scan), for security audits (use /security-audit), for threat modeling (use /threat-model). TRIGGERS: login, logout, signin, signup, authentication, authorization, password, credential, token, JWT, OAuth, OAuth2, OIDC, SSO, SAML, session, cookie, RBAC, ABAC, permissions, roles, MFA, 2FA, TOTP, API key, PKCE.
data-validation
by cosmix
Data validation patterns including schema validation, input sanitization, output encoding, and type coercion. Use when implementing validate, validation, schema, form validation, API validation, JSON Schema, Zod, Pydantic, Joi, Yup, sanitize, sanitization, XSS prevention, injection prevention, escape, encode, whitelist, constraint checking, invariant validation, data pipeline validation, ML feature validation, or custom validators.
model-evaluation
by cosmix
Evaluates machine learning models for performance, fairness, and reliability using appropriate metrics and validation techniques. Covers training debugging, hyperparameter tuning, and production monitoring. Trigger keywords: model evaluation, metrics, accuracy, precision, recall, F1, F1-score, ROC, AUC, ROC-AUC, confusion matrix, cross-validation, k-fold, stratified, overfitting, underfitting, bias, variance, bias-variance tradeoff, hyperparameter, hyperparameter tuning, loss, loss function, metric, benchmark, benchmarking, model performance, classification metrics, regression metrics, RMSE, MSE, MAE, MAPE, R2, R-squared, train-test split, validation set, test set, hold-out, learning curve, validation curve, model selection, error analysis, residual analysis, ML testing, training issues, convergence, gradient, vanishing gradient, exploding gradient, training instability, LLM evaluation, language model evaluation, prompt engineering evaluation, A/B testing, champion-challenger, model monitoring, model drift, data drift, concept drift, model decay.
api-documentation
by cosmix
Document REST APIs with OpenAPI/Swagger specifications, endpoint documentation, authentication, error handling, and SDK guides. Use for API reference docs, Swagger specs, and client library documentation. Triggers: api docs, openapi, swagger, endpoint documentation, rest api, api reference, sdk documentation, api specification, document api, api endpoints, request response examples, schema documentation, openapi 3.1, redoc, stoplight, postman collection, api explorer, interactive docs, api contract, api schema, swagger ui, authentication flows, rate limits.
api-design
by cosmix
Designs RESTful APIs, GraphQL schemas, and RPC interfaces following best practices for consistency, usability, and scalability. Trigger keywords: api design, REST, RESTful, REST API, GraphQL, GraphQL schema, gRPC, OpenAPI, Swagger, endpoint, route, resource, CRUD, HTTP method, GET, POST, PUT, PATCH, DELETE, status code, pagination, filtering, sorting, versioning, HATEOAS, API versioning, schema design, RPC, service design.
e2e-testing
by cosmix
End-to-end testing patterns and best practices for web applications using Playwright, Cypress, Selenium, and Puppeteer. Covers Page Object Model, test fixtures, selector strategies, async handling, visual regression testing, and flaky test prevention. Includes QA expertise for acceptance testing, smoke testing, cross-browser testing, and test reliability. Use when setting up E2E tests, debugging test failures, improving test reliability, or implementing browser automation. Trigger keywords: e2e, e2e testing, end-to-end, end-to-end tests, Playwright, Cypress, Selenium, Puppeteer, Page Object Model, page object, test fixtures, selectors, locator, locators, data-testid, async tests, visual regression, visual testing, screenshot, flaky tests, flakiness, browser testing, browser automation, UI test, UI testing, acceptance test, acceptance testing, smoke test, smoke testing, integration test, wait, waits, assertion, assertions, test data, test isolation.
hyva-cms-component
by hyva-themes
Create custom Hyvä CMS component. This skill should be used when the user wants to create a new Hyvä CMS component, build a Hyvä component, or needs help with components.json and PHTML templates for Hyvä CMS. Trigger phrases include "create hyva cms component", "add cms component", "new hyva component", "build page hyva cms element", "custom cms element".
multiplayer-game
by rivet-dev
"Pragmatic patterns for building multiplayer games: matchmaking, tick loops, realtime state, interest management, and validation."
frontend-ui-integration
by julianromli
Implement or extend a user-facing workflow in a web application, integrating with existing backend APIs. Use when the feature is primarily a UI/UX change backed by existing APIs, affects only the web frontend, and requires following design system, routing, and testing conventions.
rsc-data-optimizer
by julianromli
Optimize Next.js App Router data fetching by converting slow client-side fetching to fast server-side fetching using React Server Components (RSC). Use when: - User reports slow initial page load with loading spinners - Page uses useEffect + useState for data fetching - StoreContext/useStore pattern causes waterfall fetching - Need to improve SEO (content not in initial HTML) - Converting "use client" pages to Server Components Triggers: "slow loading", "optimize fetching", "SSR data", "RSC optimization", "remove loading spinner", "server-side fetch", "convert to server component", "data fetch lambat", "loading lama"
electron
by Gentleman-Programming
Electron patterns for building cross-platform desktop applications. Trigger: When building desktop apps, working with Electron main/renderer processes, IPC communication, or native integrations.
tailwind-4
by Gentleman-Programming
Tailwind CSS 4 patterns and best practices. Trigger: When styling with Tailwind - cn(), theme variables, no var() in className.
react-native
by Gentleman-Programming
React Native patterns for mobile app development with Expo and bare workflow. Trigger: When building mobile apps, working with React Native components, using Expo, React Navigation, or NativeWind.
nextjs-15
by Gentleman-Programming
Next.js 15 App Router patterns. Trigger: When working with Next.js - routing, Server Actions, data fetching.
angular-forms
by Gentleman-Programming
Angular forms: Signal Forms (experimental) and Reactive Forms. Trigger: When working with forms, validation, or form state in Angular.
spring-boot-3
by Gentleman-Programming
Spring Boot 3 patterns for configuration, DI, and web services. Trigger: When building or refactoring Spring Boot 3 applications.
zod-4
by Gentleman-Programming
Zod 4 schema validation patterns. Trigger: When using Zod for validation - breaking changes from v3.
ai-sdk-5
by Gentleman-Programming
Vercel AI SDK 5 patterns. Trigger: When building AI chat features - breaking changes from v4.
java-21
by Gentleman-Programming
Java 21 language and runtime patterns for modern, safe code. Trigger: When writing Java 21 code using records, sealed types, or virtual threads.
conference-talk-builder
by nicknisi
Create conference talk outlines and iA Presenter markdown slides using the Story Circle narrative framework. Use when the user wants to structure a tech talk, create presentation slides, or needs help organizing talk ideas into a story-driven format.
plantuml
by SpillwaveSolutions
Generate PlantUML diagrams from text descriptions and convert them to PNG/SVG images. Use when asked to "create a diagram", "generate PlantUML", "convert puml to image", "extract diagrams from markdown", or "prepare markdown for Confluence". Supports all PlantUML diagram types including UML (sequence, class, activity, state, component, deployment, use case, object, timing) and non-UML (ER diagrams, Gantt charts, JSON/YAML visualization, mindmaps, WBS, network diagrams, wireframes, and more).
seo-best-practices
by Logos-Liber
SEO methodologies, keyword research techniques, and optimization strategies for search engine visibility