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.
> How to load, filter, and work with tectonic plate boundary and polygon data using GeoPandas. Use this skill whenever the user mentions plate boundaries, tectonic plates, PB2002 data, or needs to identify which tectonic plate a point belongs to, or extract boundaries for a specific plate like Pacific (PA), African (AF), North American (NA), etc.
Answer questions from JSON enterprise data and write results to answer.json. Use this skill when the user asks multiple questions about enterprise data and needs answers stored in a JSON file with token counts. Handles the output format requirements for answer.json.
Compare hedge fund holdings between two quarters to identify changes in investment positions. Use this skill when analyzing Q-over-Q changes in fund portfolios, finding top increased/decreased positions, or tracking specific fund activity across reporting periods. Triggers on questions about "change from Q2 to Q3", "increased investment", "top buys/sells", or any cross-quarter 13F comparison.
Analyze SEC 13F filings data from TSV files. Use this skill whenever the user asks about hedge fund holdings, AUM (Assets Under Management), stock positions, fund managers, or any analysis of 13F filings data. Triggers on questions about fund portfolios, investment positions, quarterly comparisons, or SEC filing data stored in COVERPAGE.tsv, INFOTABLE.tsv, SUMMARYPAGE.tsv files.
How to patch Apache Druid JavaScript RCE vulnerabilities (CVE-2021-25646 and similar). Use this skill whenever patching Druid JavaScript filter/aggregator security bypass vulnerabilities, when the @JacksonInject config can be overridden via JSON, or when handling arbitrary code execution via JavaScript in Druid sampler/query endpoints.
How to build Apache Druid with Maven, including how to skip OOM-prone modules, skip code quality checks for patched files, and build only specific modules. Use this skill when building Druid from source, when rebuilding after applying security patches, or when Maven build fails due to memory or code quality check issues.
Security considerations for Jackson @JacksonInject annotation in Java applications. How to prevent JSON input from overriding server-injected values. Use this skill whenever reviewing code that uses @JacksonInject, when an attacker could supply JSON to override configuration objects, or when fixing deserialization vulnerabilities related to injectable values.
> total counts, bug report identification by label substring matching, and resolved bug counts. Use this skill whenever the user asks about issue metrics, bug counts, triage stats, or community health reports for a GitHub repo.
> How to fetch and analyze pull request data from a GitHub repository for a contributors. Use this skill whenever the user wants PR metrics, pull request summaries, contributor leaderboards, or community pulse reports.
> How to gather GitHub repository statistics (PRs, issues, contributors) using the GitHub REST API via curl and Python. Use this skill whenever the user asks for a community pulse, activity summary, monthly report, or repository metrics for any GitHub repo — even if they don't explicitly mention the API.
Set up and run NLP preference optimization experiments (DPO, SimPO, CPO). Use this skill when configuring trainer environments, installing dependencies (torch, trl, transformers, peft), or running preference optimization unit tests. Triggers on: DPO, SimPO, preference optimization, trl trainer, RLHF, alignment training.
> Fill Word offer letter templates with employee data, replacing {{PLACEHOLDER}} tokens and handling {{IF_CONDITION}}...{{END_IF_CONDITION}} conditional blocks. Use this skill whenever the user asks to generate, fill, or produce an offer letter from a .docx template and a JSON data file, or whenever you need to merge HR data into a Word document template with placeholders and optional sections (e.g. relocation package, signing bonus).
Organizes PDF, PPTX, and DOCX academic files into subject folders by extracting and analyzing their title/abstract text. Use this skill whenever the user needs to sort or categorize a batch of research papers or documents into topic-based folders (e.g., LLM, quantum computing, biology, physics, music). Handles arXiv papers and other academic documents automatically.
Guide for translating Python fluent builder patterns and mutable accumulator objects to idiomatic immutable Scala builders with companion objects. Use this skill when converting Python classes with method chaining (returning self), mutable state accumulation, or factory/build() methods to Scala.
Guide for translating Python generic containers (covariant/contravariant), functor/monad simulations, and JSON handling to idiomatic Scala. Use this skill when converting Python Generic[T_co], Generic[T_contra], TokenFunctor, TokenMonad, or json.dumps/json.loads patterns to Scala variance annotations, proper functional types, and Circe JSON.
Guide for translating Python Enum, Protocol, and abstract class hierarchies to Scala sealed trait hierarchies. Use this skill whenever converting Python Enum classes, runtime-checkable Protocol types, abstract base classes (ABC), or Union type aliases to idiomatic Scala sealed traits, case objects, and type classes.
Parse a visual calendar PDF to extract existing appointments and find earliest available meeting slots. Handles blue (low-priority/flexible) blocks as overwritable free time. Use when given a calendar image/PDF and meeting requests that need to be scheduled without conflicts.
Generate formatted meeting reply emails and save them as .txt files, then log results to results.json. Use when you need to respond to meeting scheduling requests with proposed time slots.
Convert meeting availability times between different timezones (e.g. PST to EST). Use when a meeting request specifies availability in a timezone different from the calendar's timezone.
> How to build a D3.js v6 force-directed bubble chart with sector clustering, size encoding, color legends, tooltips, and interactive selection. Use this skill whenever the user wants a bubble chart, force simulation, cluster layout, or interactive SVG circles with D3.
> How to build an interactive HTML data table driven by D3.js v6 with sortable columns, row highlighting, cross-component selection, and formatted values. Use this skill when building tabular displays alongside D3 charts, especially when the table needs to stay in sync with chart interactions.
How to run the General Lake Model (GLM3) for lake temperature simulation, calibrate parameters in glm3.nml, read NetCDF output with Python, and compute RMSE metrics against field observations. Use this skill whenever the user mentions GLM, lake temperature simulation, glm3.nml, or wants to calibrate lake model parameters.
Query and filter travel CSV datasets (restaurants, accommodations, attractions, distances) using Python. Use this skill whenever you need to extract specific records from the travel database files, check pet policies, filter by cuisine, look up driving times, or validate that a city exists in the dataset.
Build a structured multi-day travel itinerary JSON from real CSV datasets. Use this skill whenever the user asks to create a travel plan, trip itinerary, or vacation schedule from a local database of cities, restaurants, accommodations, and attractions.
Convert RGB color images to grayscale and save them in-place, overriding the original files. Use this skill whenever the user asks to convert images to gray-scale, desaturate photos, or prepare images for grayscale processing pipelines using OpenCV or Pillow.
Extract key frames (I-frames) from video files using FFmpeg. Use this skill whenever the user needs to pull keyframes, thumbnails, or important frames from MP4, MKV, AVI, or other video formats. Outputs PNG image files named with zero-padded indices (e.g., keyframes_001.png).
How to write INDEX&MATCH, VLOOKUP&MATCH, XLOOKUP, and similar two-condition lookup formulas in Excel using openpyxl. Use this skill whenever the user needs to populate data cells using lookup functions that match on two criteria (e.g., series code AND year), especially when pulling cross-sheet data with dynamic row/column matching.
How to calculate weighted means, net export percentages, and statistical summaries (min, max, median, mean, percentiles) in Excel using SUMPRODUCT, ROUND, PERCENTILE, and other functions. Use this skill whenever the user needs GDP-weighted averages, trade statistics as percent of GDP, or descriptive statistics across a cross-section of countries or entities.
Guidelines for applying Anthropic's brand identity, including color palettes, typography, and visual principles. Use this skill whenever creating branded assets, posters, or UI designs for Anthropic.
Techniques and Python script patterns for generating technical exploded-view illustrations, including component layering, annotation leader lines, and isometric projection basics. Use this skill when generating hardware diagrams or exploded views.
Guidance on using classical Chinese poetic imagery for themes like war and peace. Use this skill when writing traditional Chinese poetry to ensure appropriate vocabulary and evoke classical aesthetics.
Guidance on composing seven-character regulated verse (七言律诗). Use this skill whenever a task requires writing traditional Chinese poetry in the seven-character regulated style, ensuring adherence to structural, parallelism, and rhyming rules (using modern Mandarin pronunciation).
Procedures for performing precise distance calculations between points and geometries using GeoPandas. Use this skill when calculating distances in kilometers, reprojecting GeoDataFrames, or finding the nearest features in a geospatial dataset.
Techniques for processing tectonic plate data, specifically using the PB2002 dataset. Use this skill when filtering points within plates, identifying plate boundaries, or working with global tectonic geometries in GeoPandas.
Specific guidance for securing JavaScript execution in Apache Druid. Use this when working with JavaScriptDimFilter, JavaScriptExtractionFn, JavaScriptAggregatorFactory, and other JS-enabled components.
Techniques for identifying and patching vulnerabilities in Apache Druid, specifically focusing on Jackson deserialization and JavaScript security. Use this skill when dealing with CVEs related to RCE or security bypasses in Druid.
Optimized Maven build commands for Apache Druid to save time and resources. Use this when you need to rebuild Druid after applying patches.
Professional methodology for transforming raw repository activity into structured community pulse reports. Use this skill when you need to calculate metrics like merge times, contributor rankings, and bug resolution rates for meeting-ready summaries.
Expert guidance on using the GitHub CLI (gh) to extract pull request and issue data for specific timeframes and repositories. Use this skill whenever you need to gather metrics for community reports, activity analysis, or repository health checks.
Robustly fill Word (.docx) templates with JSON data. Handles split placeholders, nested tables, headers/footers, and conditional logic like IF/END_IF blocks. Use this skill whenever you need to generate professional documents from templates.
Logic for mapping employee JSON data to offer letter template placeholders. Includes handling of conditional fields like relocation packages. Use this skill when preparing data for offer letter generation.
Guidelines for translating Python dataclasses, enums, and collections to Scala.
Guidelines for translating Python functional patterns and simulations to idiomatic Scala.
Guidelines for translating Python TypeVars and Protocols to Scala Generics and Traits.
Guidelines for mapping Python standard libraries (json, datetime) to Scala equivalents (Circe, java.time).
Extracts meeting durations and constraints from a meeting request JSON file (e.g., test_input.json). Use this whenever you need to process incoming meeting invitations to understand their specific requirements.
Generates reply text files and the final result log with specific formatting for date, time, and JSON. Use this skill whenever you need to provide a professional meeting proposal in a fixed format.
Logic for finding the earliest possible meeting slot based on calendar availability and email request constraints. Use this skill whenever you need to propose a meeting time from a set of constraints and an existing schedule.
Claude Skills — questions
Answers built from the skills we actually parsed.