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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.

61 913
unique skills
out of 79 566 files found on GitHub
17 653
are copies
same content, someone else's repository
1 739
tokens, median
what a typical skill costs you in context
7 886
name collisions
two skills with one name cannot sit side by side

43 201–43 260 of 61 913

page 721 of 1 032
npm Audit Security Analysis
by cxcscmu

Identifying vulnerabilities in Node.js dependencies using the npm audit tool to filter for high and critical severities.

325 tokens
Vulnerability JSON Parsing
by cxcscmu

Extracting specific security metadata (CVE, CVSS, Fix versions) from structured vulnerability reports like npm audit JSON or OSV.

388 tokens
Geopandas Spatial Filtering
by cxcscmu

Use GeoPandas to filter points within a specific polygon, such as finding earthquakes within a specific tectonic plate.

245 tokens
Geospatial Metric Projections
by cxcscmu

Transform GeoPandas objects to metric projections (like World Equidistant Cylindrical) to calculate distances in meters or kilometers rather than degrees.

267 tokens
Plate Tectonics Pb2002 Parsing
by cxcscmu

Specific knowledge of the PB2002 (Bird, 2002) dataset structure for identifying the Pacific plate.

198 tokens
Spatial Distance To Boundary
by cxcscmu

Calculate the shortest distance between points (earthquakes) and a complex line geometry (plate boundaries).

254 tokens
Enterprise Data Parsing
by cxcscmu

Strategies for reading and indexing diverse enterprise data formats located in a flat directory or specific path.

220 tokens
Formatted JSON Answer Generation
by cxcscmu

Generating a JSON output file with specific requirements for list-based answers and numeric token counts.

242 tokens
Question File Processing
by cxcscmu

How to parse key-value pairs from a text file where keys and question values are stored together.

188 tokens
Token Usage Tracking
by cxcscmu

Methods for calculating or retrieving the number of tokens consumed during an LLM inference task.

199 tokens
Analyze Fund Holdings And Aum
by cxcscmu

Retrieve a fund's AUM, stock holding counts, or compare investment changes between two quarters.

326 tokens
Analyze Stock Ownership
by cxcscmu

Identify and rank the top fund managers holding a specific stock CUSIP in a given quarter.

179 tokens
Search Fund Accession Number
by cxcscmu

Fuzzy search the COVERPAGE data to find the specific accession_number for a hedge fund in a given quarter.

184 tokens
Search Stock Cusip
by cxcscmu

Find the CUSIP (Committee on Uniform Securities Identification Procedures) identifier for a specific company or stock.

135 tokens
Druid Jackson Parameter Mapping Fix
by cxcscmu

Securing Jackson deserialization in Druid to prevent user-supplied JSON keys from overriding system-injected security configurations.

414 tokens
Druid Javascript Vulnerability Locator
by cxcscmu

Systematic identification of all Apache Druid components utilizing JavaScript to ensure comprehensive patching of CVE-2021-25646.

392 tokens
Druid Patch Rebuild Procedure
by cxcscmu

Creating, applying, and verifying patches for Apache Druid using Maven with specific flags to bypass non-essential checks.

308 tokens
Calculate Github Community Metrics
by cxcscmu

Processes JSON data from GitHub Search results to compute specific repository health metrics including average merge time, top contributors, and bug resolution counts.

433 tokens
Github API Paginated Search
by cxcscmu

Fetch data from GitHub's Search API using the GitHub CLI (gh) while correctly handling pagination and merging results. Use this when you need to retrieve more than 100 items or ensure full dataset coverage for a specific period.

310 tokens
Extract PDF Content
by cxcscmu

Extracts text and mathematical descriptions from a PDF file to identify specific algorithm parameters and loss functions. This is used to ensure the implementation matches the theoretical definition in the paper.

303 tokens
Implement Simpo Loss
by cxcscmu

Implements the SimPO (Simple Preference Optimization) loss function with length normalization and reward margin as specified in the research paper.

263 tokens
Run Unit Test And Save Results
by cxcscmu

Executes the provided unit test to verify the SimPO loss implementation and saves the output to a specific NPZ file for evaluation.

200 tokens
Setup Repo Environment
by cxcscmu

Aligns the local environment with the repository's requirements by checking for dependency files, installing build-essential tools for complex packages like DeepSpeed, and logging environment metadata.

287 tokens
DOCX Custom Conditional Logic
by cxcscmu

Manually processes non-standard conditional markers like `{{IF_VARIABLE}}` and `{{END_IF_VARIABLE}}` in a Word document. It identifies blocks of text to either retain (removing markers) or delete (removing the block) based on data.

583 tokens
DOCX Recursive Text Replacement
by cxcscmu

Replaces placeholders in a Word document across all sections, including headers, footers, body paragraphs, and deeply nested tables. It uses paragraph-level replacement to ensure placeholders split across multiple runs are correctly identified.

450 tokens
Batch File Organization
by cxcscmu

Discovers PDF, DOCX, and PPTX files in a directory (handling hidden characters and extensions robustly), extracts their text, determines their subject, and moves them into organized folders.

515 tokens
Classify Scientific Document
by cxcscmu

Categorizes a document into one of five subjects (LLM, trapped_ion_and_qc, black_hole, DNA, music_history) based on an expanded technical keyword dictionary. It prioritizes the beginning of the text (titles and abstracts) where subject density is highest.

729 tokens
Extract Office Text With Pandoc
by cxcscmu

Extracts text from .docx and .pptx files using `pandoc`. This tool is preferred for its robustness in handling various document schemas and converting them into plain text for analysis.

204 tokens
Extract PDF Text With Poppler
by cxcscmu

Extracts text from PDF files using the `pdftotext` command-line utility with the `-layout` flag to preserve multi-column formatting, which is essential for accurately parsing scientific papers.

256 tokens
Scala 213 Type Hierarchy And Modeling
by cxcscmu

Define idiomatic Scala 2.13 type hierarchies and domain models, replacing Python's class structures and Enums with traits and case classes.

324 tokens
Scala Fluent Builder Pattern
by cxcscmu

Implement a fluent Builder pattern in Scala to provide a clean API for object configuration and instantiation.

317 tokens
Scala Functional Parsing And Error Handling
by cxcscmu

Implement idiomatic Scala logic for parsing temporal/numeric data and handling batch processing using functional transformations and error types.

344 tokens
Analyze PDF Calendar
by cxcscmu

Parse the calendar PDF to identify existing appointments, flexible blue slots, and the 15-minute grid coordinate mapping.

344 tokens
Extract Meeting Requests
by cxcscmu

Extract meeting duration, constraints, and metadata from the input JSON file containing email requests.

190 tokens
Generate Formatted Replies
by cxcscmu

Generate meeting confirmation text files based on a specific template and save the results in a JSON log.

349 tokens
Schedule Sequential Slots
by cxcscmu

Find the earliest available meeting slots for multiple requests, treating blue blocks as available and updating the schedule state after each assignment.

271 tokens
GenerateD3VisualizationLogic
by cxcscmu

Creates the core D3.js logic in visualization.js. This includes data loading, custom market cap formatting (supporting "T" for Trillions), force simulation for sector clustering, bubble generation, and bidirectional table highlighting.

1k tokens
GenerateStockVisualizerWebAssets
by cxcscmu

Creates the HTML and CSS files for the stock visualization app. The HTML provides the structure for the side-by-side layout (bubble chart and table), while the CSS handles styling, scrolling, and highlighting logic.

700 tokens
SetupStockVisualizerWorkspace
by cxcscmu

Initializes the directory structure and populates the environment with necessary data and libraries for the D3.js visualization. This skill should be executed before generating any code files to ensure the target paths exist and the D3 library is available locally.

176 tokens
Glm Config Optimization
by cxcscmu

Manage and calibrate General Lake Model (GLM) configuration files (glm3.nml) within specified parameter constraints and physical ranges.

261 tokens
Glm Metric Validator
by cxcscmu

Calculate specific RMSE metrics by merging simulation and observation data using exact datetime and rounded-depth matching.

334 tokens
Glm Output Parser
by cxcscmu

Extract and transform water temperature data from GLM NetCDF files, handling dynamic layering, masked arrays, and temporal alignment.

316 tokens
Ground Transport Route Logic
by cxcscmu

Logic for planning itineraries that rely on ground transportation (driving) rather than flights, ensuring travel feasibility and daily activity engagement.

314 tokens
Itinerary Content Requirements
by cxcscmu

Guidelines for selecting database-compliant restaurants, accommodations, and attractions based on specific user constraints like budget, pets, and cuisine.

319 tokens
Itinerary Validation Check
by cxcscmu

A final verification step to ensure the JSON output meets all structural and constraint requirements before delivery.

290 tokens
Batch Grayscale Conversion Inplace
by cxcscmu

Converts all extracted keyframe images in a directory from RGB to grayscale and overwrites the original files.

178 tokens
Count Objects Optimized
by cxcscmu

Counts occurrences of specific objects (coins, enemies, turtles) in a frame using a template matching script with optimized parameters.

272 tokens
Extract Keyframes From Video
by cxcscmu

Converts a video file into a series of keyframe images using FFmpeg with specific frame selection filters.

199 tokens
Generate Counting Results CSV
by cxcscmu

Aggregates counting data for all frames and objects into a final CSV file formatted as required.

334 tokens
Excel Descriptive Statistics
by cxcscmu

Use standard Excel functions to calculate basic statistical measures across a range of values.

149 tokens
Excel Percentage Scaling Rounding
by cxcscmu

Convert decimal percentages to whole-number representations and round to a specific decimal place.

199 tokens
Excel Two Way Lookup
by cxcscmu

Perform a two-dimensional lookup in Excel to retrieve data based on both a row criteria (e.g., series code) and a column criteria (e.g., year).

288 tokens
Excel Weighted Average Sumproduct
by cxcscmu

Calculate a weighted mean using the SUMPRODUCT and SUM functions.

174 tokens
Anthropic Brand Color System
by cxcscmu

Defines the official, sanctioned Anthropic brand palette and HEX mapping for all technical documentation and hardware visualization assets.

169 tokens
Anthropic Typography Standards
by cxcscmu

Specifies the sanctioned typefaces for Anthropic internal engineering handbooks and technical posters.

143 tokens
Technical Exploded View Protocol
by cxcscmu

Provides the workflow for creating minimalist, low-saturation technical illustrations using the Nova device as a template.

230 tokens
File Formatting And Output
by cxcscmu

Handles the final writing of the poem into the specified file path, enforcing strict formatting constraints.

134 tokens
Poetic Composition
by cxcscmu

Composes an eight-line seven-character regulated verse (Qiyan Lüshi) focusing on historical or emotional themes, ensuring exact line counts and structural integrity.

186 tokens
Regulated Verse Structure And Tonal Mapping
by cxcscmu

Applies the specific tonal patterns and rhyme requirements for a seven-character regulated verse to ensure classic prosody.

170 tokens
California Small Claims Data Mapping
by cxcscmu

Use this skill to map specific natural language case details to the legal requirements of the SC-100 form.

250 tokens

Claude Skills — questions

Answers built from the skills we actually parsed.

What is a Claude Skill?
A folder with a SKILL.md file: instructions that teach an agent to do one thing well, optionally with scripts and reference files alongside. The format is open and called Agent Skills — Claude Code, Codex and other agents read the same files. It is not a program you run; it is knowledge the agent loads when the task calls for it.
How is a skill different from an MCP server?
A server gives the agent new abilities — it connects to something and exposes tools. A skill gives the agent knowledge: how to use what it already has. They combine, and often literally: 11 350 of the skills here declare which MCP servers they need to work.
Why are there fewer skills here than in other catalogues?
Because we deduplicate by content. Of 79 566 files found on GitHub, 61 913 are unique — the rest is the same skill copied into someone else's repository, word for word. Catalogues that count files rather than skills show every copy as a separate entry.
What does the token count mean?
A skill is loaded into the model's context when it is used, so its size is a running cost on every request that touches it. We measure the whole folder, not just SKILL.md: one official skill is 377 tokens, another drags 83 files of fonts behind it.
How do I install a skill?
Copy the skill folder into ~/.claude/skills for personal use, or into .claude/skills inside a project. The agent picks it up by the name in the SKILL.md header — which is worth checking: 7 886 skills here share a name with another skill, and two of them cannot sit side by side.