Data & AI

Update .brain/ context files after completing tasks. Use when: updating project context, documenting changes, maintaining activeContext.md, updating systemPatterns.md, tracking session progress, documenting decisions.

Build accessible web interfaces following WCAG guidelines and assistive technology best practices. Use this skill when creating or modifying UI components that need keyboard navigation, screen reader support, or ARIA attributes. When working on files like components/, pages/, or any file with interactive elements, forms, modals, or dynamic content. When adding alt text to images, labels to form inputs, or managing focus in single-page applications. When implementing color contrast, heading structure, or semantic HTML elements.

Integrates SQLite embedded database with Node.js using better-sqlite3 for synchronous operations or the native Node.js SQLite module. Use when building applications with local storage, embedded databases, or when user mentions SQLite, better-sqlite3, or embedded SQL.

Progressive four-tier URL content scraping with automatic fallback strategy.USE WHEN user says "scrape this URL", "fetch this page", "get content from","can't access this site", "use Bright Data", "pull content from URL",or needs to retrieve web content that may have bot detection or access restrictions.

Core prompt engineering and context engineering best practices for Claude Code prompts.

Refactor complex Android/KMP state management code to use FlowRedux state machine pattern. Use this when developers need to transform tangled state logic, multiple LiveData/StateFlow sources, or callback-heavy code into a clean, testable state machine architecture.

Build and maintain a fast navigation index of the repo.

Execute Gray Swan AI Arena indirect prompt injection (IPI) and machine-in-the-middle (MITM) challenges with optimized payloads, reconnaissance workflows, and evidence collection for CTF competition success

Build Retrieval-Augmented Generation systems with vector databases

DeepSeek AI large language model API via curl. Use this skill for chat completions, reasoning, and code generation with OpenAI-compatible endpoints.

Build timeout-resistant Claude Code workflows with chunking strategies, checkpoint patterns, progress tracking, and resume mechanisms to handle 2-minute tool timeouts and ensure reliable completion of long-running operations.

スキーマ設計やマイグレーション作成時に使用。

Expert in managing Google Sheets spreadsheets. Use when user mentions "spreadsheet", "Google Sheets", "sheets", or requests spreadsheet operations (create, format, style, import CSV, export data, add formulas). Provides comprehensive operations for data manipulation, cell formatting (currency, dates, percentages), styling (colors, fonts), CSV import/export.

Generate LLM-backed release notes between git tags using the repo release-scripts. Use when asked for changelogs, release notes, or summaries between two tags.

Build MCP (Model Context Protocol) servers with tools, prompts, and resources. Use when developing MCP servers, implementing tools/prompts/resources, debugging MCP issues, writing tests, or deploying servers. Covers SDK patterns, validation, and best practices.

Batch news analyzer for /news page. Processes multiple news articles simultaneously, extracting sentiment, keywords, themes, and ticker mentions. Generates aggregated market intelligence including trending topics and ticker buzz scores.

This skill should be used when the user asks to "profile the data", "explore the dataset", "plan the analysis", or as Phase 2 of the /ds workflow after brainstorming. Profiles data and creates analysis task breakdown.

Check decisions against beliefs, wisdom, and intentions. Use before significant actions to ensure coherence with accumulated knowledge.

Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, or applications. Generates creative, polished code that avoids generic AI aesthetics.

Moai Lib Shadcn Ui - Professional implementation guide