Claude Skills
The open format is called Agent Skills and works in Claude Code, Codex, Cursor and other agents — most people know it as Claude Skills.
Every Agent Skill we could find on GitHub, deduplicated by content. 79 566 files from 1 758 authors, of which 61 913 are unique — the rest is the same skill repackaged into someone else's repository. For each one: what it weighs in tokens, whether it ships runnable scripts, and which MCP servers it needs.
Parse meeting request emails from test_input.json to extract meeting details. This skill helps extract recipient email, message ID, meeting duration, and any date/time constraints from JSON email records. Use this whenever you need to process meeting requests from a JSON file.
Generate properly formatted meeting confirmation emails and save results. This skill handles creating reply text files with exact formatting (date format with day name and full date, time format with leading zeros), generating results.json with metadata, and ensuring compliance with the response template. Use this whenever you need to format meeting confirmations or generate scheduled meeting documentation.
Find the earliest available meeting time slots that satisfy constraints. This skill implements the scheduling algorithm to match meeting requests with available calendar slots, handling blue (flexible) block overwriting, time constraints, and date preferences. Use this whenever you need to schedule a meeting or find available time slots.
Extract appointments and time blocks from a calendar PDF. This skill helps parse calendar.pdf to identify appointment blocks, their positions on the timeline, duration, and color coding (including blue blocks that represent flexible/overwritable slots). Use this whenever you need to extract calendar data from a PDF document.
Synchronize interactions between D3 visualizations and HTML tables, enabling click-to-highlight and hover effects across both elements. Use this skill when you need chart and table elements to stay in sync - clicking a bubble highlights its table row, clicking a row highlights the bubble, and/or hovering shows related data across both. Essential for exploratory dashboards where users need to see data from multiple perspectives simultaneously.
How to create a force-directed bubble chart in D3.js (v6+). Use this skill whenever the user asks to build a bubble chart, cluster bubbles by category, or use d3.forceSimulation to position SVG circles without overlap.
Load, parse, and transform stock market data from CSV files for D3 visualization. Use this skill when working with financial CSV data, handling missing values (ETFs often lack market cap/country data), formatting market capitalization as human-readable strings (1.64T), and preparing data for both visualization and table display. Essential for stock dashboards, portfolio analytics, and financial data pipelines.
Managing and modifying GLM configuration files (glm3.nml) for calibration. Use this skill whenever you need to safely update GLM parameters, preserve non-calibration settings, validate configuration syntax, or manage multiple parameter sets. Essential for iterative calibration workflows where parameters must change reliably without corrupting the config.
How to run the General Lake Model (GLM) for lake water temperature simulation. Use this skill whenever you need to execute GLM simulations, understand GLM configuration files (*.nml), interpret GLM output (NetCDF), or troubleshoot GLM execution. Essential for lake modeling and water temperature prediction tasks.
Computing RMSE (Root Mean Squared Error) and other metrics for water temperature model validation. Use this skill whenever you need to match simulated temperatures with field observations, compute RMSE by depth categories, calculate annual/seasonal subsets, or prepare model evaluation metrics. Essential for lake model calibration and validation workflows.
Build multi-day travel itineraries with routing, scheduling, and constraint satisfaction. Use this skill whenever creating a structured travel plan that must span multiple days, visit specific cities, include meals and accommodations, and respect travel time and budget constraints. Essential for generating day-by-day itineraries in JSON or structured formats.
Optimize travel costs including accommodations, meals, transportation, and attractions while respecting budget constraints. Use this skill whenever building a trip with specific budget limits that require cost calculation, price comparison, or financial constraint satisfaction. Essential for maximizing trip value within fixed budgets.
Parse and search travel-related databases including cities, accommodations, restaurants, attractions, and distances. Use this skill whenever building a travel itinerary that requires querying real-world data from CSV files or text databases. This skill helps extract relevant POIs, lodging, dining, and routing information from structured datasets.
Complete workflow for analyzing Super Mario game video frames and generating statistics. Use this skill when you need to extract video frames, process them for analysis, count game objects using template matching, and generate CSV reports of game element statistics.
Count specific objects in images using template matching with reference object images. Use this skill when you need to detect and count game elements, sprites, or recurring visual patterns in screenshots or game frames using a template image as reference.
Extract keyframes from MP4 video files and convert them to grayscale. Use this skill when you need to process video files for analysis by extracting I-frames (keyframes) and converting them to grayscale images for computer vision tasks.
Calculate financial metrics in Excel including percentages of GDP, percentage changes, and weighted averages. Use this skill when working with economic data, calculating net exports as percentage of GDP, or deriving financial ratios from raw data.
Master two-condition lookups in Excel using INDEX&MATCH, XLOOKUP&MATCH, and HLOOKUP&MATCH. Use this skill whenever working with Excel lookups that require matching on two or more criteria (e.g., finding values based on both a row and column condition, or series code and year).
> Authoritative reference for Anthropic's official brand color palette, typography, and design tokens. Use this skill whenever creating any Anthropic-branded artifact, poster, UI, or document that must apply official HEX values for background, casing, "corporate dark", "identity light", "primary accent", "secondary accent", "tertiary accent", "brand tokens", "muted mid gray", "Anthropic typography".
> Generate technical exploded-view posters of hardware devices using Python Pillow. Use this skill when creating engineering diagrams, exploded-view illustrations, hardware layer breakdowns, or technical documentation posters programmatically.
Rules and structure for composing Chinese seven-character regulated verse (七言律诗). Use this skill whenever composing, analyzing, or explaining 七言律诗, 律诗, or classical Chinese regulated verse — even if the user just says "write a Chinese poem" in a formal style.
Classical Chinese poetic imagery and techniques for war and peace themes. Use this skill when composing or analyzing Chinese poetry about war, peace, soldiers, refugees, or the suffering of common people during conflict.
California Small Claims Court SC-100 form field mapping and filling guide. Use this skill when filling out California SC-100 Plaintiff's Claim forms, understanding small claims court procedures, or mapping case details to SC-100 form fields.
Fill PDF form fields programmatically using Python and pypdf. Use this skill whenever the user needs to fill out a PDF form, set text fields, or check checkboxes in a PDF document.
Define custom distance/similarity metrics for clustering and ML algorithms. Use when working with DBSCAN, sklearn, or scipy distance functions with application-specific metrics.
Parallel processing with joblib for grid search and batch computations. Use when speeding up computationally intensive tasks across multiple CPU cores.
> Calculate geodesic distances between earthquake points and plate boundaries using GeoPandas projections. Use this skill when computing distances in kilometers between geographic points and linestring/polygon boundaries, especially for finding the furthest earthquake, geodesic distance, plate boundary distance.
> Analyze tectonic plate geometries using GeoPandas with proper coordinate projections. Use this skill whenever working with PB2002 plate boundary/plate polygon data, filtering points by plate membership, or extracting plate-specific boundaries.
> Analyze Slack message threads to identify participants, extract insights, and find shared resources. Use this skill when tracing who contributed to discussions about documents, competitor products, or shared URLs/demos in enterprise Slack data.
Perform data analysis on SEC 13-F filing datasets (TSV format) to obtain insights about fund activities such as number of holdings, AUM, and change of holdings between two quarters. Use this skill whenever analyzing hedge fund portfolios, comparing quarterly holdings, or working with SEC EDGAR 13F data files.
Fuzzy search fund names in SEC 13F COVERPAGE data or stock names in INFOTABLE data. Use this skill whenever searching for a fund or stock by name when the exact spelling or format is uncertain, or when performing case-insensitive partial matching on SEC filing data.
Patching Apache Druid JavaScript injection vulnerability (CVE-2021-25646). Use this skill when fixing Druid's JavaScript execution bypass where empty JSON keys override @JacksonInject JavaScriptConfig to enable JavaScript execution despite being disabled server-wide.
Fixing Jackson @JacksonInject bypass vulnerabilities where attackers use empty JSON keys to override injected values. Use this skill whenever reviewing or patching Java code that uses @JacksonInject for security-sensitive configuration injection, especially in Apache projects.
> Query GitHub repository activity (PRs, issues) for a date range using the gh CLI. Use this skill whenever you need to fetch pull request or issue data from a GitHub repository, compute statistics like counts, merge times, or identify top contributors. Triggers on tasks involving GitHub activity reports, community pulse summaries, or repository metrics gathering.
> Build structured JSON reports from GitHub repository activity data. Use this skill whenever you need to compile PR and issue statistics into a formatted JSON file for meeting summaries, community pulse reports, or stakeholder updates. Triggers on tasks that require outputting a report.json or similar artifact from GitHub metrics.
Set up Python environments for NLP/ML projects using PyTorch, transformers, and TRL. Use this skill when installing dependencies for preference optimization, RLHF, or transformer-based training pipelines.
> Fill Word document (.docx) templates that use placeholder syntax like {{PLACEHOLDER}}. Handles split placeholders (where Word splits a placeholder across multiple XML runs), conditional sections ({{IF_X}}...{{END_IF_X}}), and preserves formatting. Use this skill whenever the user asks to fill a Word template, generate a document from a template, or replace placeholders in a .docx file.
Organizes mixed document files (PDF, PPTX, DOCX) into subject-based folders by analyzing content. Use this skill when sorting, categorizing, or organizing documents into topic folders.
Classifies PDF academic papers by subject area using text extraction from first pages. Use this skill whenever you need to categorize, sort, or organize PDF papers by topic, research field, or subject matter.
> Translating Python builder patterns, fluent interfaces, and factory functions to Scala. Use when converting Python classes with method chaining, __init__ with mutable lists/dicts, or builder/factory patterns to idiomatic Scala with immutable state and companion objects.
> Translating Python enums, dataclasses, and union types to Scala sealed traits, case classes, and ADTs. Use when converting Python Enum classes to Scala enumerations, Python dataclasses to Scala case classes, or Python Union/Optional types to Scala Option/Either/sealed hierarchies.
> Translating Python generics, variance annotations, protocols, and type variables to Scala type parameters, variance annotations, and traits. Use when converting Python Generic[T], TypeVar with covariant/contravariant, Protocol classes, or higher-kinded type simulations to Scala.
Parse visual calendar PDFs to extract existing appointments with their time ranges, colors, and availability status. Use this skill whenever processing calendar images/PDFs to determine busy/free slots, even if the user just says "check my calendar" or "find available time".
Schedule meetings by matching email requests against calendar availability. Use this skill when processing meeting request emails, finding optimal meeting times, or generating meeting reply templates. Triggers on phrases like "schedule a meeting", "find a time", "propose meeting slots".
> Build interactive data tables with D3.js that are linked to other D3 visualizations. Use this skill when building HTML tables with D3 that need click-to-highlight interaction, interactive table, linked table and chart, click to highlight.
> Calibrate the General Lake Model (GLM) for lake temperature simulation. Use this skill whenever calibrating GLM parameters, running GLM simulations, or tuning Kw, coef_mix_hyp, wind_factor, lw_factor, or ch to match observed water temperature profiles. Covers Lake Mendota and similar dimictic lakes.
> Extract simulated temperature from GLM NetCDF output and match against field observations for RMSE evaluation. Use this skill when computing RMSE metrics from GLM output.nc files matched against CSV observation data with datetime and depth columns. Covers exact datetime + rounded-depth merging.
Build multi-day travel itineraries in JSON format from database lookups. Use this skill when constructing day-by-day travel plans with transportation, meals, attractions, and accommodations.
Look up travel data from the local CSV/TXT database for cities, restaurants, accommodations, attractions, and distances. Use this skill whenever planning a trip, building an itinerary, or querying travel-related datasets in /app/data/.
Convert RGB images to grayscale using OpenCV (cv2) in Python. Use this skill when the user needs to convert color images to grayscale for image processing, template matching, or analysis.
Count occurrences of objects in images using OpenCV template matching. Use this skill when the user needs to detect and count specific objects (coins, enemies, items) in game screenshots or similar images using a reference template image.
Extract key frames (I-frames) from video files using FFmpeg. Use this skill when the user needs to pull out keyframes from MP4, MKV, AVI, or other video formats for analysis or processing.
> How to use INDEX&MATCH for two-dimensional lookups in Excel via openpyxl. Use this skill whenever building Excel formulas that look up values by matching both a row criterion and a column criterion from a data table — e.g., matching a series code (row) and a year (column). Trigger when the user mentions VLOOKUP&MATCH, HLOOKUP&MATCH, XLOOKUP&MATCH, INDEX&MATCH, or two-condition lookups.
> How to calculate weighted means and descriptive statistics (min, max, median, percentiles, simple mean) in Excel formulas via openpyxl. Use this skill whenever the user asks for SUMPRODUCT-based weighted averages, GDP-weighted means, percentile calculations, or descriptive statistics in Excel.
> How to generate a design_parameters.json file containing the applied HEX color values and heading font name used in a branded poster or artifact. Use this skill whenever a task requires outputting a machine-readable record of design tokens "applied hex values", "color parameters json", "brand token json output".
> How to generate a technical exploded-view hardware poster as a PNG using Python (matplotlib + Pillow). Use this skill whenever the user asks for an exploded-view diagram, hardware layer diagram, technical product poster, or engineering teardown "PCB diagram", "technical poster", "engineering poster", "teardown illustration".
How to compose a seven-character regulated verse (七言律诗) in Classical Chinese poetry. Use this skill whenever the user asks to write classical Chinese poetry, a regulated verse, a 律诗, or any structured poem with tonal rules, rhyme schemes, and parallelism requirements. Covers structure, tonal patterns, rhyming (based on modern Mandarin), antithesis couplets, and thematic guidance.
How to fill out California Small Claims Court forms (SC-100 and related). Use this skill whenever the user needs to complete a California small claims court filing, fill in plaintiff/defendant information, describe a claim, or prepare court documents for small claims cases.
> How to run DBSCAN clustering with a custom anisotropic distance metric using sklearn and scipy. Use this skill whenever the user needs to cluster spatial points with a weighted or shape-adjusted distance, such as attenuating x vs y distances differently, or when DBSCAN needs a non-Euclidean metric defined as a callable. Covers cluster centroid computation and noise-point handling.
> How to parse USGS GeoJSON earthquake data, filter by location relative to tectonic plates, and find the earthquake furthest from a plate boundary. Use this skill whenever the user asks to find earthquakes within a plate, compute distances from plate boundaries, or analyze USGS earthquake catalog data with GeoPandas.
Claude Skills — questions
Answers built from the skills we actually parsed.