better-auth
Implement authentication and authorization with Better Auth - a framework-agnostic TypeScript authentication framework. Features include email/password authentication with verification, OAuth providers (Google, GitHub, Discord, etc.), two-factor authentication (TOTP, SMS), passkeys/WebAuthn support, session management, role-based access control (RBAC), rate limiting, and database adapters. Use when adding authentication to applications, implementing OAuth flows, setting up 2FA/MFA, managing user sessions, configuring authorization rules, or building secure authentication systems for web applications.
backend-development
Build robust backend systems with modern technologies (Node.js, Python, Go, Rust), frameworks (NestJS, FastAPI, Django), databases (PostgreSQL, MongoDB, Redis), APIs (REST, GraphQL, gRPC), authentication (OAuth 2.1, JWT), testing strategies, security best practices (OWASP Top 10), performance optimization, scalability patterns (microservices, caching, sharding), DevOps practices (Docker, Kubernetes, CI/CD), and monitoring. Use when designing APIs, implementing authentication, optimizing database queries, setting up CI/CD pipelines, handling security vulnerabilities, building microservices, or developing production-ready backend systems.
algorithmic-art
Creating algorithmic art using p5.js with seeded randomness and interactive parameter exploration. Use this when users request creating art using code, generative art, algorithmic art, flow fields, or particle systems. Create original algorithmic art rather than copying existing artists' work to avoid copyright violations.
ai-multimodal
Process and generate multimedia content using Google Gemini API. Capabilities include analyze audio files (transcription with timestamps, summarization, speech understanding, music/sound analysis up to 9.5 hours), understand images (captioning, object detection, OCR, visual Q&A, segmentation), process videos (scene detection, Q&A, temporal analysis, YouTube URLs, up to 6 hours), extract from documents (PDF tables, forms, charts, diagrams, multi-page), generate images (text-to-image, editing, composition, refinement). Use when working with audio/video files, analyzing images or screenshots, processing PDF documents, extracting structured data from media, creating images from text prompts, or implementing multimodal AI features. Supports multiple models (Gemini 2.5/2.0) with context windows up to 2M tokens.
aesthetic
Create aesthetically beautiful interfaces following proven design principles. Use when building UI/UX, analyzing designs from inspiration sites, generating design images with ai-multimodal, implementing visual hierarchy and color theory, adding micro-interactions, or creating design documentation. Includes workflows for capturing and analyzing inspiration screenshots with chrome-devtools and ai-multimodal, iterative design image generation until aesthetic standards are met, and comprehensive design system guidance covering BEAUTIFUL (aesthetic principles), RIGHT (functionality/accessibility), SATISFYING (micro-interactions), and PEAK (storytelling) stages. Integrates with chrome-devtools, ai-multimodal, media-processing, ui-styling, and web-frameworks skills.
mcp-builder
Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Use when building MCP servers to integrate external APIs or services, whether in Python (FastMCP) or Node/TypeScript (MCP SDK).
mcp-management
Manage Model Context Protocol (MCP) servers - discover, analyze, and execute tools/prompts/resources from configured MCP servers. Use when working with MCP integrations, need to discover available MCP capabilities, filter MCP tools for specific tasks, execute MCP tools programmatically, access MCP prompts/resources, or implement MCP client functionality. Supports intelligent tool selection, multi-server management, and context-efficient capability discovery.
media-processing
Process multimedia files with FFmpeg (video/audio encoding, conversion, streaming, filtering, hardware acceleration) and ImageMagick (image manipulation, format conversion, batch processing, effects, composition). Use when converting media formats, encoding videos with specific codecs (H.264, H.265, VP9), resizing/cropping images, extracting audio from video, applying filters and effects, optimizing file sizes, creating streaming manifests (HLS/DASH), generating thumbnails, batch processing images, creating composite images, or implementing media processing pipelines. Supports 100+ formats, hardware acceleration (NVENC, QSV), and complex filtergraphs.
figma-mcp-downloader
CLI for downloading complete Figma design context and metadata to local files. Always use this CLI instead of calling Figma MCP tools (`get_design_context`, `get_metadata`) directly. Direct MCP tool calls risk incomplete data due to context limits. This CLI guarantees 100% complete output.
analyze-size
Analyze codebase size and language distribution using cloc. Use when user wants to understand codebase scale, primary languages, code composition, or assess project complexity. Provides total LOC, size category, language breakdown percentages, and key insights.
web-to-markdown
Batch-process web pages via headless Playwright browser, extract HTML, convert to markdown using Turndown, and save to timestamped scratchpad file. Use when user asks to "capture these pages as markdown", "save web content", "fetch and convert webpages", or needs clean markdown from HTML. All URLs from one prompt → single file at docs/web-captures/<timestamp>.md.
scratchpad-fetch
Download and aggregate web pages/docs into timestamped scratchpad files. Use when user asks to "concatenate all these resources", "get all these links", "checkout all these resources", or wants to gather fresh context from documentation URLs. All URLs from one prompt go into single file at docs/scratchpad/<timestamp>.md.
readwise-api
Fetch and analyze Readwise reading activity for any date range. Use when user asks about articles saved, highlights created, or most-highlighted content for today, yesterday, last week, last month, or custom date ranges (e.g., "show my Readwise activity from Jan 1-7"). Requires READWISE_API_TOKEN env var. Connects to Readwise Highlights API (v2) and Reader API (v3).
parallel-search
Comprehensive web research via Parallel Search API. Use when user requests parallel search for deep multi-source research, technical analysis, learning new topics, current events, or comparative studies. Returns LLM-ready ranked URLs with extended excerpts (up to 30K chars). Single API call handles multiple query angles with automatic deduplication.
gh-code-search
Search GitHub for real-world code examples and implementation patterns. Use when user wants to find code examples on GitHub, search GitHub repositories, discover how others implement features, learn library usage patterns, or research architectural approaches. Fetches top results with smart ranking (stars, recency, language), extracts factual data (imports, syntax patterns, metrics), and returns clean markdown for analysis and pattern identification.
gemini-research
Web research via Gemini CLI with Google Search grounding. Generates markdown report. Claude MUST append analysis section after. Use for real-time data: news, docs, code examples, fact verification.
brainwriting
Facilitate structured brainstorming using parallel sub-agents to explore idea spaces. Use for IDEATION/CONCEPTUAL WORK ONLY, NOT for implementation planning or task breakdown. Use when user wants to brainstorm, explore ideas, generate concepts, develop vision, or discover creative directions. Transforms vague ideas into practical, tangible expressions through 5 rounds of parallel agent analysis and refinement.
start-feature
Create or switch to feature branches with proper naming conventions. Use when user wants to start working on a new feature, start a feature. Generates feature/branch-name patterns from descriptions, checks existence, and creates/switches accordingly.
git-commit
Create conventional commits from staged/unstaged changes. Use when user asks to commit, create commits, commit changes, commit all, make commits, separate commits, commit everything, stage and commit, commit these changes, save and push, commit this work, or requests push after committing. Handles single or multiple commits, staging, message generation from diffs, and push operations.
fix-eslint
Automatically fix ESLint errors by modifying code to comply with linting rules. For small codebases (≤20 errors), fixes directly. For larger codebases (>20 errors), spawns parallel agents per directory for efficient processing. Never disables rules or adds ignore comments.
finish-feature
Complete feature work and merge back to main branch. Use when user wants to finish a feature, close a feature, or merge feature branch. Switches to main, pulls latest changes, merges feature branch, and pushes to remote.
dev-work-summary
Scan ~/dev recursively for git repos and report today's work with commits, branches, stats, and detailed change analysis. Use when user asks "what did I work on", "show my work", "daily summary", "what repos did I touch".
code-review
Expert code review specialist. Reviews for quality and intent alignment. Use immediately after writing or modifying code, or when user requests code review. Handles both uncommitted changes and targeted file reviews.
claude-permissions
Configure, manage, update and review Claude Code permissions, sandboxing, and tool access. Use when user wants to set up permissions, configure sandboxing, update allowed tools, manage settings.json permissions, or review permissions in skills or commands or agents or settings.json. When user writes a new skill, command, agent, or updates settings.json, they should use this skill to manage permissions.
timestamp
Generate deterministic timestamps in YYYYMMDDHHMMSS format using bash. Use when you need timestamps for filenames, logging, or any situation requiring consistent timestamp formatting without LLM generation.
plugin-creator
Create Claude Code plugins with proper structure. Use when user requests "create a plugin" or needs to scaffold a new plugin with metadata, directories, and marketplace registration.
typescript-coding
Expert TypeScript/JavaScript development guidance. Use when planning or writing TypeScript/JavaScript code, setting up TS/JS projects, configuring build tools (pnpm, Vite, TypeScript), implementing tests (Vitest), adding logging (pino for services, chalk/console for CLIs), working with React/Tailwind/Xstate, or following FP patterns. Covers stack decisions, tooling setup, testing strategies, and logging patterns for both services and CLI tools.
skill-creator
Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Claude's capabilities with specialized knowledge, workflows, or tool integrations.
prompting
Prompt engineering standards and context engineering principles for AI agents based on Anthropic best practices. Covers clarity, structure, progressive discovery, and optimization for signal-to-noise ratio.
formbuilder-admin
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paper-writing
Expert guidance for writing high-quality academic and research papers. Use when the user wants to write, structure, revise, or improve academic papers, research articles, conference papers, or technical reports. Provides comprehensive support for all stages from planning to final polish.
interlock-ops
Operational rules for Interlock enforcement and receipts
multi-agent-coordination
Synchronize work between Antigravity and Claude Code agents
maintainer
PR triage, merge receipts, CI sanity, artifact/PII hygiene
governed-dev
Evidence-first development with fail-closed behavior
island-state
This skill should be used when the user asks to "add global state", "create a store", "use Nanostores", "share state between components", "manage reactive state", "add a provider", "create a context", "initialize state", or needs help with state management patterns across React islands in this static site.
blogging
This skill should be used when the user asks to "add a blog post", "create a new post", "write a learn article", "publish an update", "add content to the learn section", "update the blog", or needs help with MDX content, frontmatter, or the content collection structure.
fork-gauge
This skill should be used when the user asks to "update the fork gauge", "change risk colors", "modify the gauge animation", "add a risk level", "update the SVG visualization", "fix the needle", "change the arc", or needs help with the fork risk visualization component and its data pipeline.
li-fi-api
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li-fi-sdk
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detect-freight-led-inflation-turn
透過美國卡斯貨運指數 (CASS Freight Index) 的週期轉折，偵測美國通膨壓力是否進入放緩或反轉階段。用於判斷「通膨是否正在降溫」，並驗證市場對降息、通膨回落的宏觀敘事是否有實體經濟數據支撐。
zeberg-salomon-rotator
用領先和同時指標建構景氣模型，並判讀兩種景氣階段：景氣擴張期 (Risk-On) 與景氣收縮期 (Risk-Off)，並根據理論給出 "撞冰山" 與 "下沉" 事件訊號。
wasde-ingestor
下載並解析 USDA 每月發布的 WASDE 報告，擷取所有主要商品（穀物、油籽、棉花、畜產品、糖）的供需平衡表。輸出標準化、可版本化的資料集，作為即時預測（nowcasting）的錨定基準。
usd-reserve-loss-gold-revaluation
在「美元／某貨幣失去儲備地位、黃金成為唯一錨」的假設下，用央行貨幣負債 ÷ 黃金儲備，推演「資產負債表可承受的隱含金價」，並輸出各國/各貨幣的槓桿程度、缺口與排名。
us-cpi-pce-comparator
自動比較美國 CPI（固定權重）與 PCE（動態權重）的通膨訊號，識別低波動高權重桶位的 PCE 上行風險。用於分析 Fed 關注的 PCE 是否正在 re-accelerate，即使 CPI 看似降溫。
track-equity-cumulative-return
Track cumulative return of stocks/indices with multi-ticker comparison, index Top N ranking, and visualization. All comparisons use S&P 500 as the fixed benchmark.
track-agri-hedge-fund-positioning
用 COT 非商業部位變化，量化對沖基金在農產品期貨的資金流向，並把出口需求、USDA 數據、美元/原油/金屬等宏觀風向整合成可交易的敘事與訊號。
nickel-concentration-risk-analyzer
以全球鎳供給結構為核心，量化各國的主導程度（例如印尼）、主要礦區供給量、以及政策配額/減產情境對全球供需平衡與價格非對稱的影響。
monitor-etf-holdings-drawdown-risk
偵測「商品價格上漲、但對應實物 ETF/信託持倉卻下滑」的背離現象，並用多指標交叉驗證，評估是否存在實物供給緊張/交割壓力風險。
lithium-supply-demand-gap-radar
將鋰產業鏈（礦端 → 精煉化學品 → 電池與終端需求），整合為一套可運算的替代指標；再把這些指標映射到鋰主題 ETF（如 LIT）的成分暴露與長期價格走勢，形成可供決策的依據。
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