hook-deduplication-guide
Use PROACTIVELY when developing Claude Code hooks to implement content-based deduplication and prevent duplicate insight storage across sessions
json-outputs-implementer
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github-repo-setup
Use PROACTIVELY when user needs to create a new GitHub repository or set up a project with best practices. Automates repository creation with four modes - quick public repos (~30s), enterprise-grade with security and CI/CD (~120s), open-source community standards (~90s), and private team collaboration with governance (~90s). Not for existing repo configuration or GitHub Actions workflow debugging.
mcp-server-creator
Use PROACTIVELY when creating Model Context Protocol servers for connecting AI applications to external data sources, tools, and workflows. Generates production-ready MCP servers with TypeScript/Python SDKs, configuration templates, and Claude Desktop integration. Includes testing workflow with MCP Inspector. Not for modifying existing MCP servers or non-MCP integrations.
mutation-testing
Use PROACTIVELY when checking if tests catch real bugs, assessing test suite quality, finding weak tests, or measuring mutation score. Validates test effectiveness beyond coverage metrics by introducing code mutations. Supports Stryker (JS/TS), PIT (Java), mutmut (Python). Not for projects without existing test suites.
otel-monitoring-setup
Use PROACTIVELY when setting up OpenTelemetry monitoring for Claude Code usage tracking, cost analysis, or productivity metrics. Provides local PoC mode (full Docker stack with Grafana) and enterprise mode (centralized infrastructure). Configures telemetry collection, imports dashboards, and verifies data flow. Not for non-Claude telemetry or custom metric definitions.
sub-agent-creator
Use PROACTIVELY when creating specialized Claude Code sub-agents for task delegation. Automates agent creation following Anthropic's official patterns with proper frontmatter, tool configuration, and system prompts. Generates domain-specific agents, proactive auto-triggering agents, and security-sensitive agents with limited tools. Not for modifying existing agents or general prompt engineering.
git-worktree-setup
Use PROACTIVELY when working on multiple branches simultaneously or creating parallel Claude Code sessions. Automates git worktree creation with prerequisite checking, development environment initialization, and safe cleanup. Supports single worktree, batch creation, and worktree removal. Not for non-git projects or branch management without worktrees.
strict-tool-implementer
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skill-isolation-tester
Use PROACTIVELY when validating Claude Code skills before sharing or public release. Automated testing framework using multiple isolation environments (git worktree, Docker containers, VMs) to catch environment-specific bugs, hidden dependencies, and cleanup issues. Includes production-ready test templates and risk-based mode auto-detection. Not for functional testing of skill logic or non-skill code.
benchmark-report-creator
Use PROACTIVELY when creating research reports, experiment writeups, technical whitepapers, or empirical study documentation. Orchestrates the complete benchmark report pipeline with structure, diagrams, hi-res PNG capture, and PDF export. Provides working scripts, CSS templates, and complete command sequences for publication-quality AI/ML benchmark reports. Not for slides, blog posts, or simple README files.
bulletproof-react-auditor
Use PROACTIVELY when users ask about React project structure, Bulletproof React patterns, or need architecture guidance. Covers structure setup, codebase auditing, anti-pattern detection, and feature-based migration planning. Triggers on "bulletproof react", "React structure help", "organize React app", or "audit my architecture".
adr-generator
Creates Architecture Decision Records (ADRs) following standard templates. Documents architectural decisions with context, options considered, and rationale. TRIGGERS - "create ADR", "document architecture decision", "new ADR", "record decision", "architecture decision record". Use when making significant architectural choices that should be documented. NOT for code documentation or README files.
claude-md-auditor
Use PROACTIVELY when reviewing CLAUDE.md configurations, onboarding new projects, or before committing memory file changes. Validates against official Anthropic documentation, community best practices, and LLM context optimization research. Detects security violations, anti-patterns, and compliance issues. Not for runtime behavior testing or imported file validation.
codebase-auditor
Use PROACTIVELY when auditing code quality, running security scans, assessing technical debt, reviewing code for production readiness, setting up CI quality gates, or tracking DORA metrics. Analyzes codebases against OWASP Top 10, SOLID principles, Testing Trophy, and 2024-25 SDLC standards. Supports incremental audits for large codebases. Not for runtime profiling or real-time monitoring.
e2e-testing
Use PROACTIVELY when setting up end-to-end testing, debugging UI issues, creating visual regression suites, or automating browser testing. Uses Playwright with LLM-powered visual analysis, screenshot capture, and fix recommendations. Zero-setup for React, Next.js, Vue, Node.js, and static sites. Not for unit testing, API-only testing, or mobile native apps.
cc-insights
Use PROACTIVELY when searching past Claude Code conversations, analyzing development patterns, or generating activity reports. Automatically processes conversation history from the project, enables RAG-powered semantic search, and generates insight reports with pattern detection. Provides optional dashboard for visualization. Not for real-time analysis or cross-project searches.
react-project-scaffolder
Use PROACTIVELY when creating new React projects requiring modern tooling and best practices. Provides three modes - sandbox (Vite + React for quick experiments), enterprise (Next.js with testing and CI/CD), and mobile (Expo + React Native). Enforces TypeScript strict mode, Testing Trophy approach, and 80% coverage. Not for non-React projects or modifying existing applications.
ascii-diagram-creator
Use PROACTIVELY when user asks for ASCII diagrams, text diagrams, or visual representations of systems, workflows, or relationships. Triggers on "ascii diagram", "text diagram", "visualize", "show how X connects/synergizes", "diagram the flow/phases", or "illustrate relationships". Generates terminal-compatible diagrams using box-drawing characters. Supports architecture, before/after, phased migration, data flow, and relationship/synergy diagrams. Not for image generation or graphical output.
semantic-release-tagger
Use PROACTIVELY when creating releases after PR merges to main, or when user asks about versioning strategy. Automated git tagging agent that analyzes repository state, parses conventional commits, calculates semantic versions, and creates annotated git tags with GitHub releases. Supports monorepo namespaced tags with @ separator convention. Not for changelog generation or pre-release/alpha versioning.
accessibility-audit
Use PROACTIVELY when user asks for accessibility review, a11y audit, WCAG compliance check, screen reader testing, keyboard navigation validation, or color contrast analysis. Audits React/TypeScript applications for WCAG 2.2 Level AA compliance with risk-based severity scoring. Includes MUI framework awareness to avoid false positives. Not for runtime accessibility testing in production, automated remediation, or non-React frameworks.
skill-creator
Use PROACTIVELY when creating new Claude Code skills from scratch. Automated generation tool following Claudex marketplace standards with intelligent templates, pattern detection, and quality validation. Supports guided creation, quick start templates, clone-and-modify, and validation-only modes. Not for modifying existing skills or non-skill Claude Code configurations.
m365-agent-developer
Designs, implements, and deploys Microsoft 365 Copilot agents using TypeSpec and ATK CLI. Provides architectural guidance, capability configuration, security patterns, and lifecycle management. Use when developing M365 Copilot agents, working with TypeSpec, or managing agent deployments. For creating new projects, use the m365-agent-scaffolder skill.
m365-agent-scaffolder
Quickly scaffolds new Microsoft 365 Copilot declarative agent (M365 agent, copilot agent, agent, declarative copilot, copilot) projects using ATK CLI. Collects project information and creates the initial project structure. Use only when creating a new empty M365 Copilot agent project from scratch.
wikidata-search
Search for items and properties on Wikidata and retrieve entity details, claims, and external identifiers. Supports both keyword search (Wikidata Action API) and semantic/hybrid search (Wikidata Vector Database), plus direct entity retrieval (Special:EntityData) and structured querying (WDQS SPARQL).
columbia-clio
Search Columbia University Libraries' CLIO catalog for books, journals, manuscripts, and other holdings via its Blacklight JSON API. Use this skill whenever the user wants to look up items in Columbia's library, check availability of books at Columbia, search by title/author/subject with faceted filtering by format/language/location, or retrieve detailed catalog records including call numbers and holdings data. Triggers when referencing Columbia University collections or Ivy League library holdings.
harvard-library-catalog
Search Harvard Library's 13M+ bibliographic records via LibraryCloud and retrieve MARC/MODS data via PRESTO. Use this skill whenever the user wants to look up books, manuscripts, finding aids, or other items in Harvard's library catalog, verify bibliographic information (title, author, ISBN, publication date), find digital collections, or retrieve detailed catalog records. Also triggers when a user extracts a book title from a document and wants to find its full bibliographic metadata.
hathitrust-catalog
Look up bibliographic records and digitized volumes in HathiTrust's 17M+ volume collection by ISBN, OCLC, LCCN, ISSN, or HathiTrust ID. Use this skill whenever the user wants to check if a book has been digitized, find which libraries hold a copy, get MARC metadata for a known identifier, or link a bibliographic reference to its HathiTrust digital version. Also triggers when cross-referencing identifiers from other library catalogs (Harvard, Library of Congress) against HathiTrust holdings.
jbdb-api
Query the Japan Biographical Database (JBDB) API to retrieve biographical data about historical Japanese figures. Use this skill when searching for information about Japanese historical figures, samurai, monks, artists, poets, or other individuals. Applicable for queries about biographical details, kinship relations, non-kinship associations, events, personal history, occupations, or when users mention specific Japanese names or JBDB person IDs.
nlb-singapore
Search the National Library Board (NLB) Singapore catalog for books, audiovisual materials, and digital resources via the official Catalogue API. Use this skill whenever the user wants to search Singapore's national library holdings, check book availability across NLB branches, look up titles by ISBN/BRN, find new arrivals, browse checkout trends, or retrieve detailed bibliographic records from NLB. Triggers when referencing Singapore library collections, Southeast Asian library holdings, or NLB resources.
europeana-collections
Search Europeana's 50M+ cultural heritage items from 4,000+ European museums, galleries, libraries, and archives. Use this skill whenever the user wants to find European art, manuscripts, photographs, maps, 3D objects, audio, or video from institutions like the Rijksmuseum, British Library, Louvre, or Gallica. Also triggers when searching for open-access European cultural heritage, IIIF resources, or cross-referencing European collections with other library catalogs.
historical-timeline
Generate interactive historical timelines as standalone HTML files using TimelineJS3. Supports BCE/CE dates, eras, media, groups, and rich text. Use when the user asks to create, build, or visualize a timeline of historical events, periods, dynasties, or biographical milestones.
human-eval-review
Generate a single self-contained HTML file for human-in-the-loop evaluation of model output. The reviewer opens it in a browser, makes per-item judgments (pick the matching candidate(s), choose one, rate on a scale, yes/no, or free-text correction), and exports their decisions as JSON. Use when you have analysis output — candidate matches, rankings, classifications, translations, extractions — that a human needs to review, confirm, score, or correct.
historical-map
Generate interactive historical maps as standalone HTML files using Leaflet.js. Supports markers with popups, GeoJSON boundary overlays, historical tile layers (Academia Sinica, MapWarper), image overlays, WMS layers, and layer controls. Use when the user asks to create, build, or visualize a map of historical places, routes, boundaries, or events.
zotero-local
Interact with a local Zotero 8 desktop application through its HTTP API at localhost:23119. Use this skill whenever the user wants to search, fetch, add, edit, or organize bibliographic items in their Zotero library, import citations (BibTeX, RIS, etc.), attach files, manage collections and tags, or retrieve full-text content from Zotero. Triggers on mentions of Zotero, citation management, reference libraries, bibliographic databases, or local library management. Also use when chaining with other catalog skills (Harvard, LOC, HathiTrust, etc.) to save found records into the user's Zotero library.
argue-against-me
Structured academic debate — Claude adopts an opposing position (from named historiographical schools or disciplinary counter-positions) and challenges your thesis through formal rounds with adjustable intensity. Produces a scorecard, revised thesis, and bibliography gap analysis. Use when stress-testing arguments, preparing for peer review, or strengthening a thesis before publication.
chgis-tgaz
Query the China Historical GIS (CHGIS) Temporal Gazetteer (TGAZ) API to search for historical Chinese placenames from 222 BCE to 1911 CE. Use this skill when searching for information about historical Chinese places, administrative units, or geographic locations during the dynastic period. Applicable for queries about historical place names, administrative hierarchies, or when users mention specific Chinese locations with historical context.
cbdb-local
Query the China Biographical Database (CBDB) locally via SQLite for biographical data on 656K+ historical Chinese figures from the 7th century BCE through the 19th century CE. Use when searching for Chinese historical figures, scholars, officials, or literary figures — their biographical details, family/kinship networks, official postings, social associations, examination records, or addresses. Runs entirely locally after initial database download (~556 MB). Faster and more flexible than the API version.
cjk-calendar
Convert between Chinese, Japanese, Korean, and Vietnamese lunisolar calendar dates and Gregorian/Julian dates. Use when the user needs to look up historical East Asian dates, convert era names (年號) like 康熙, 天保, 崇禎 to Western dates, compute sexagenary cycle (干支) day/month/year, or work with Julian Day Numbers. Supports ~220 BCE to 1945 CE with 1,637 eras and 131,808 lunar month records. Runs entirely locally with a SQLite database.
loc-catalog
Search the Library of Congress digital collections via the loc.gov JSON API. Use this skill whenever the user wants to search LOC's digitized books, photos, maps, manuscripts, newspapers, audio, or film/video, look up items by LCCN, browse LOC collections, find primary sources with date range filters, or retrieve citations and download links for LOC materials. Also triggers when cross-referencing items found in other library catalogs against LOC holdings.
tgaz-query
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cbdb-api
Query the China Biographical Database (CBDB) API to retrieve comprehensive biographical data about historical Chinese figures. Use this skill when searching for information about Chinese historical figures, scholars, officials, or literary figures from the 7th century BCE through the 19th century CE. Applicable for queries about biographical details, social relationships, official positions, or when users mention specific Chinese names or CBDB person IDs.
arxiv-search
Search arXiv for preprints and scholarly articles across physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering, systems science, and economics. Supports field-specific queries (title, author, abstract, category), boolean logic, date filtering, and bulk retrieval with pagination.
gurume-cli
Use the `gurume` CLI to search Japanese restaurants on Tabelog. Trigger this whenever the user wants to find, recommend, or research restaurants/eateries in Japan — by area (Tokyo, Osaka, Kyoto, 三重, etc.), by cuisine (ramen, sushi, yakiniku, izakaya...), or with a vague request like "where should I eat in Shibuya" or "any good unagi spots near Tokyo Station". Use this even when the user does not explicitly mention Tabelog or the `gurume` tool, as long as the intent is finding Japanese restaurants.
brand-guidelines
Applies Anthropic's official brand colors and typography to any sort of artifact that may benefit from having Anthropic's look-and-feel. Use it when brand colors or style guidelines, visual formatting, or company design standards apply.
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.
internal-comms
A set of resources to help me write all kinds of internal communications, using the formats that my company likes to use. Claude should use this skill whenever asked to write some sort of internal communications (status reports, leadership updates, 3P updates, company newsletters, FAQs, incident reports, project updates, etc.).
template-skill
Replace with description of the skill and when Claude should use it.
web-artifacts-builder
Suite of tools for creating elaborate, multi-component claude.ai HTML artifacts using modern frontend web technologies (React, Tailwind CSS, shadcn/ui). Use for complex artifacts requiring state management, routing, or shadcn/ui components - not for simple single-file HTML/JSX artifacts.
webapp-testing
Toolkit for interacting with and testing local web applications using Playwright. Supports verifying frontend functionality, debugging UI behavior, capturing browser screenshots, and viewing browser logs.
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