Jeffallan

Build Rails 7+ applications with partial page updates, real-time connections, and background jobs. The skill implements Hotwire, Action Cable, and Sidekiq features, improves Active Record database queries, and writes RSpec tests.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Adding partial page updates with Hotwire
• Building real-time features with Action Cable
• Moving slow tasks to Sidekiq jobs

Analyze and tune PostgreSQL databases using query execution plans, which show how queries run. This skill guides index design, JSONB searches, replication setup, maintenance, and monitoring, with checks to compare behavior before and after changes.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Investigate slow queries with EXPLAIN
• Design indexes for JSONB searches
• Configure replication and monitor lag

Build .NET 8 APIs and backend services using C# 12, with clear separation of application responsibilities. The skill covers database access, authentication, API documentation, compilation checks, and integration tests that verify components working together.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Building endpoints with minimal APIs
• Adding database access with Entity Framework Core
• Separating application responsibilities with MediatR

Build MCP servers and clients that connect AI systems to external tools and data. The skill defines validated inputs, implements tool and resource handlers, configures communication methods, and checks protocol behavior with the MCP Inspector.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Expose external tools and data to AI systems through MCP
• Start an MCP project in TypeScript or Python
• Validate inputs and investigate protocol errors

Design systems made of independently deployable services, or plan how to split an existing application. The skill produces service boundary diagrams and recommendations for communication, data ownership, failure handling, monitoring, and deployment.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Planning how to split a monolithic application
• Choosing REST, gRPC, or event-based communication
• Defining data ownership and cross-service consistency

Create Playwright tests that check user journeys in a browser. The skill organizes reusable page interactions, configures test environments, investigates intermittent failures using execution traces, and supports API mocking, visual comparisons, and automated pipeline integration.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Test login and other browser user journeys
• Investigate tests that fail intermittently
• Replace API responses with controlled test data

Configure Django file storage on AWS S3 using django-storages and boto3. Separate public and private files, create temporary download or upload links, configure CloudFront delivery, and test storage behavior without accessing real S3 buckets.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Moving Django static files and uploads to S3
• Separating public files from private documents
• Creating temporary download and direct upload links

Build machine learning workflows that connect data checks, training, evaluation, and deployment. The skill implements experiment tracking, model version management, and automated retraining, with reproducible environments and explicit validation thresholds before models enter production.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Automate model training and retraining workflows
• Record and compare machine learning experiments
• Build a feature store for model input data

Create Dockerfiles, automated build and deployment pipelines, Kubernetes configurations, and infrastructure templates. The skill also prepares deployment checks, rollback procedures, and incident response runbooks to support application releases and production operations.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Setting up automated build and deployment pipelines
• Packaging applications with Docker
• Managing Kubernetes and cloud infrastructure as code

Design REST or GraphQL APIs by defining data relationships, requests, responses, and authentication. Produce OpenAPI specifications, machine-readable API descriptions, with consistent errors, pagination, and versioning plans, then validate contracts using a mock server.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Designing a new API from business requirements
• Creating and validating OpenAPI specifications
• Standardizing errors and paginated responses

Build Angular 17+ applications with standalone components, routing, and shared application state. Covers reactive data handling with RxJS, performance improvements, and unit and integration tests, with code and explanations of architecture choices.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Building Angular screens with standalone components
• Managing shared application state with NgRx
• Configuring lazy-loaded routes and access guards

Create Kubernetes deployment files and Helm charts, reusable application packages. Configure permissions, network isolation, and persistent storage, then investigate pod failures and resource usage to adjust workloads and verify deployment health.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Create deployment YAML and Helm charts
• Configure access permissions and network isolation
• Set up persistent storage and sensitive configuration

Investigate slow PostgreSQL and MySQL queries using execution plans, which show how the database runs a query. Develop index, SQL, and configuration changes, then compare measurements before and after each change to validate the results.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Investigating slow SQL queries
• Reviewing database index design
• Tuning memory and database configuration

Build Go services and command-line tools with clear interfaces, explicit error handling, and concurrent tasks using goroutines and channels. Use pprof to investigate performance, then check behavior with benchmarks, structured test cases, fuzzing, and race detection.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Implementing concurrent tasks with cancellation and error handling
• Building gRPC or REST services and command-line tools
• Investigating Go performance with pprof and benchmarks

Design or review a system’s overall structure, compare technology choices, and plan for growth and failures. Produce architecture diagrams and Architecture Decision Records, documents that explain key choices, alternatives, and their consequences.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Designing the overall structure of a new system
• Comparing monolith and microservices architectures
• Recording technology decisions and alternatives

Build, debug, and refactor JavaScript applications for browsers and Node.js. Covers asynchronous tasks with async/await, module organization, performance checks, and test creation, with explicit error handling and modern ES2023+ syntax.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Build a vanilla JavaScript application
• Fix errors in asynchronous API requests
• Organize code into ESM modules

Set up application monitoring with structured logs, performance metrics, and traces that follow requests across services. Build dashboards and alerts, run load tests, investigate CPU and memory bottlenecks, and estimate future infrastructure capacity.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Set up application dashboards and alerts
• Investigate production issues using logs, metrics, and traces
• Run load tests before traffic increases

Build and debug mobile apps for iOS and Android with React Native and Expo. Implement navigation, adapt screens to each platform, integrate native modules that access platform features, and improve list rendering, keyboard behavior, and memory use.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Building an app for both iOS and Android
• Adding tabs, navigation stacks, and deep links
• Improving scrolling performance in long lists

Connect AI agents to Jira and Confluence through MCP, a protocol for accessing external tools. This skill guides issue searches and updates, page management, sprint workflows, authentication setup, and troubleshooting of Atlassian integrations.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Find Jira issues by assignee or status
• Search and update Confluence pages
• Turn meeting notes into Jira ticket updates

Turn a feature idea into a specification through structured questions about users, business goals, and technical constraints. Produce requirements, user stories, testable acceptance criteria, and an implementation checklist, including performance, security, and error handling.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Defining requirements for a new feature
• Clarifying vague feature requests
• Writing testable acceptance criteria

Build web application features across the interface, API, and database, with authentication, input checks, and safe data handling. The skill guides technical design, implementation, error handling, and component testing in one workflow.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Building data entry and editing forms with matching APIs
• Adding authenticated profile pages
• Designing data flows from database to interface

Create and maintain code comments, API specifications, documentation sites, and user guides. Apply consistent formats, document parameters and errors, validate code examples, and report which parts of the code have been documented.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Add explanations to public functions and classes
• Create API specifications and reference pages
• Build a documentation site

Write, review, and debug Rust applications, including ownership and borrowing rules that govern memory use. Covers trait-based APIs, explicit error handling, asynchronous work with tokio, and tests with Cargo validation.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Resolve ownership, borrowing, and lifetime errors
• Design APIs with traits
• Implement asynchronous tasks with tokio

Build Python APIs with FastAPI and Pydantic V2, including input validation, database operations that avoid blocking other work, and token-based authentication. Implement REST or WebSocket endpoints, then check their behavior with automated tests and generated API documentation.

한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.

• Build REST APIs with FastAPI
• Validate input data with Pydantic V2
• Implement JWT authentication and authorization