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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
tgaz-query
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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.
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.
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.
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.
template-skill
Replace with description of the skill and when Claude should use it.
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.).
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.
intellij-plugin-builder
Guide for creating IntelliJ Platform plugins using Gradle and Kotlin/Java. Use when users want to create, configure, or develop plugins for IntelliJ IDEA or other JetBrains IDEs.
doc-coauthoring
Guide users through a structured workflow for co-authoring documentation. Use when user wants to write documentation, proposals, technical specs, decision docs, or similar structured content. This workflow helps users efficiently transfer context, refine content through iteration, and verify the doc works for readers. Trigger when user mentions writing docs, creating proposals, drafting specs, or similar documentation tasks.
docx
Comprehensive document creation, editing, and analysis with support for tracked changes, comments, formatting preservation, and text extraction. When Claude needs to work with professional documents (.docx files) for: (1) Creating new documents, (2) Modifying or editing content, (3) Working with tracked changes, (4) Adding comments, or any other document tasks
frontend-design
Create distinctive, production-grade frontend interfaces with high design quality. Use this skill when the user asks to build web components, pages, artifacts, posters, or applications (examples include websites, landing pages, dashboards, React components, HTML/CSS layouts, or when styling/beautifying any web UI). Generates creative, polished code and UI design that avoids generic AI aesthetics.
Comprehensive PDF manipulation toolkit for extracting text and tables, creating new PDFs, merging/splitting documents, and handling forms. When Claude needs to fill in a PDF form or programmatically process, generate, or analyze PDF documents at scale.
pptx
Presentation creation, editing, and analysis. When Claude needs to work with presentations (.pptx files) for: (1) Creating new presentations, (2) Modifying or editing content, (3) Working with layouts, (4) Adding comments or speaker notes, or any other presentation tasks
canvas-design
Create beautiful visual art in .png and .pdf documents using design philosophy. You should use this skill when the user asks to create a poster, piece of art, design, or other static piece. Create original visual designs, never copying existing artists' work to avoid copyright violations.
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).
opencode
Expertise for using OpenCode (an open-source AI coding agent) and building client applications that interact with the OpenCode HTTP server. Use this skill when the user asks about OpenCode features, how to use it, or how to build tools/clients that integrate with the OpenCode server API.
slack-gif-creator
Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack."
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.
theme-factory
Toolkit for styling artifacts with a theme. These artifacts can be slides, docs, reportings, HTML landing pages, etc. There are 10 pre-set themes with colors/fonts that you can apply to any artifact that has been creating, or can generate a new theme on-the-fly.
xlsx
Comprehensive spreadsheet creation, editing, and analysis with support for formulas, formatting, data analysis, and visualization. When Claude needs to work with spreadsheets (.xlsx, .xlsm, .csv, .tsv, etc) for: (1) Creating new spreadsheets with formulas and formatting, (2) Reading or analyzing data, (3) Modify existing spreadsheets while preserving formulas, (4) Data analysis and visualization in spreadsheets, or (5) Recalculating formulas
web-to-markdown
Use ONLY when the user explicitly says: 'use the skill web-to-markdown ...' (or 'use a skill web-to-markdown ...'). Converts webpage URLs to clean Markdown by calling the local web2md CLI (Puppeteer + Readability), suitable for JS-rendered pages.
synchronizing-grok-convos
Global/continuous sync of your private Grok conversations from both grok.com and x.com into a clean Obsidian vault. Uses Playwright for reliable discovery across surfaces, supports bookmarklet capture, requires Defuddle, and produces 6-stream maximized Markdown with surface origin in frontmatter. Default target: ~/.grok/conversations/
transcribing-youtube
Download and transcribe YouTube videos into clean, deduplicated Markdown documents with chapter headings. Wraps yt-dlp to fetch subtitles (manual or auto-generated), removes the rolling-text triplication artifacts from auto-subs, inserts chapter markers from video metadata, and produces both a timestamped transcript and a prose-only version. Use when the user wants to: (1) transcribe a YouTube video, (2) get a transcript or subtitles from YouTube, (3) create an InfoNugget from a video, (4) extract text from a YouTube URL or video ID, or (5) mentions yt-dlp, YouTube transcript, or video subtitles.
skill-resiliency
This skill should be used when the user asks to "add resiliency to a skill", "make this skill more robust", "improve error handling", "add validation mechanisms", "create self-correcting behavior", or discusses determinism, robustness, error correction, or homeostatic patterns in Agent Skills. Applies biological resiliency principles from Michael Levin's work to Agent Skill design.
writing-eval-sloptastic
Quantitative framework for detecting AI-generated "slop" in prose through systematic analysis of structural, lexical, rhetorical, and logical patterns. Use when analyzing text authenticity, evaluating writing quality, detecting AI-generated content, or assessing whether prose has characteristic AI patterns like excessive parallelism, abstraction laddering, chiasmus abuse, platitudes, tautologies, or rhetorical overengineering.
validated-knowledge-synthesis
Transform raw, unorganized information into actionable knowledge through systematic validation. Use when users want to synthesize information from multiple sources (documents, URLs, transcripts, notes) into structured knowledge documents. Supports three document types - curated context (default, optimized for recall), guidance (implementation-focused narrative), and reference (quick lookup). Combines convergent synthesis with tension preservation to maintain productive contradictions. Triggers on requests like "synthesize this information", "create knowledge document from these sources", "transform these notes into actionable guidance", or "help me organize this research".
guided-ooda-loop
Universal pattern for structured LLM interaction managing finite context windows through phased progression (Observe-Orient-Decide-Act). Use when the user has a complex problem, wants to design/build/create something (software, strategy, document, process), or uses phrases like "I have an idea for...", "help me design...", "guide me through...", or mentions OODA, RPI, or PDD. Reduces hallucinations through structured interaction.
prompt-driven-development
Transform rough ideas into detailed design documents with implementation plans. Use when a user wants to develop an idea into a complete specification, create a design document from a concept, plan a feature implementation, or mentions "PDD", "prompt-driven development", "idea to design", "design doc from idea", or wants to systematically refine requirements before building. Guides through requirements clarification, research, detailed design, and implementation planning.
response-quality-analysis
Analyze whether your response addresses the actual question asked before posting. Use when: (1) About to post response to forum/Slack question, (2) Want to validate response coverage, (3) Need to ensure solving the right problem, (4) Want specific improvement suggestions for gaps in response
ai-workflow-engineering
Guide for creating reliable AI workflows and SOPs. Use when: (1) User wants to create a structured workflow for AI tasks, (2) User needs to build an SOP for complex processes, (3) User wants to ensure their workflow follows best practices for managing LLM uncertainty, (4) User mentions creating workflows for domains like code review, response analysis, documentation, or any structured process
codebase-summary
Analyze a codebase and generate comprehensive documentation including architecture, components, interfaces, workflows, and dependencies. Creates an AI-optimized knowledge base (index.md) and can consolidate into AGENTS.md, README.md, or CONTRIBUTING.md. Use when the user wants to document a codebase, create AGENTS.md, understand system architecture, generate developer documentation, or asks to "summarize the codebase".
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