Math
Mathematical computations, formulas, statistics
jax-pde
by tondevrel
Advanced sub-skill for JAX focused on solving Partial Differential Equations (PDEs) and Differentiable Physics. Covers Finite Difference Methods (FDM), Neural Operators, and Physics-Informed Neural Networks (PINNs).
chempy
by tondevrel
A Python package useful for chemistry (mainly physical/analytical/inorganic chemistry). Features include balancing chemical reactions, chemical kinetics (ODE integration), chemical equilibria, ionic strength calculations, and unit handling. Use when working with chemical equations, reaction balancing, kinetic modeling, equilibrium calculations, speciation, pH calculations, ionic strength, activity coefficients, or chemical formula parsing.
astropy
by tondevrel
The core library for Astronomy and Astrophysics in Python. Provides data structures for coordinates, time, units, FITS files, and cosmological models. Essential for observational data reduction and theoretical astrophysics. Use when working with astronomical coordinates (RA/Dec), physical units, FITS files, time scales, WCS, cosmology, or astronomical tables.
pyscf
by tondevrel
Comprehensive guide for PySCF - Python-based Simulations of Chemistry Framework. Use for ab initio quantum chemistry calculations including Hartree-Fock, DFT, MP2, CCSD, geometry optimization, excited states, and molecular properties. Industry-standard library for electronic structure calculations.
numpy
by G1Joshi
NumPy numerical computing with arrays. Use for numerical operations.
jax
by G1Joshi
JAX high-performance numerical computing. Use for ML research.
Maintaining Consistent Abstractions
by obra
Class interfaces present one cohesive abstraction - don't mix domain logic with serialization, persistence, or unrelated concerns
xlsx
by kcchien
"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"
Cross-Platform App Development Skill
by fal3
Strategies for developing apps that work across multiple Apple platforms, including adaptive layouts and multi-view implementations.
model-thinking
by kcchien
Mental models toolkit for clearer thinking, better decisions, and problem-solving. Use when users face complex problems, need decision support, want to analyze situations from multiple angles, organize information, understand systems, predict outcomes, or learn about specific mental models. Triggers include phrases like "help me think through", "analyze this problem", "what models apply here", "how should I decide", "evaluate options", or direct model references (e.g., "use second-order thinking", "apply inversion"). 中文觸發：「思維模型」、「幫我分析」、「決策分析」、「多角度思考」、「怎麼判斷」、「幫我想清楚」、「系統思考」、「風險評估」。
cetus-clmm-sdk-skill
by RandyPen
Guides developers through using Cetus CLMM TypeScript SDK for liquidity management, pool operations, swaps, and reward collection. Use when working with Cetus Protocol's Concentrated Liquidity Market Maker (CLMM) or when the user mentions Cetus SDK, CLMM, liquidity pools, or DeFi on Sui.
estimate-transaction-fee
by b-open-io
This skill should be used when the user asks to "estimate transaction fee", "calculate BSV fee", "fee per byte", "transaction cost", or needs to estimate fees based on transaction size and current rates.
calculator-helper
by Dexploarer
Performs mathematical calculations and conversions. Use when user asks to "calculate", "compute", "what is the result of", "convert units", or needs math help.
threejs-scene-builder
by Dexploarer
Comprehensive Three.js and React Three Fiber skill for creating 3D scenes, characters, NPCs, procedural generation, animation retargeting, and interactive experiences. Use when user asks to "create Three.js scene", "setup React Three Fiber", "add 3D character", "create NPC AI", "procedural 3D generation", "retarget animation", "setup avatar system", or "create 3D game".
labour-law-calculator
by swarochish
"Calculate statutory benefits under Indian labour laws including PF, ESI, Gratuity, Bonus, Retrenchment Compensation, Notice Pay, and Leave Encashment with precise formulas"
meihua-yishu
by JWCodeWrote
A comprehensive traditional Chinese metaphysics agent ("Yi Jing" expert) that combines Mei Hua Yi Shu (Timing) with Gemini AI for modern interpretation.
text_summarizer
by rscheiwe
Summarizes long text into key bullet points
remote-work-negotiation
by founderjourney
Sistema para negociar trabajo remoto y compensacion para Senior Full-Stack Developers. Usar cuando el usuario necesite preparar negociacion salarial, defender trabajo remoto, evaluar ofertas, o responder preguntas sobre compensacion. Activa con palabras como salario, compensacion, remoto, negociar, oferta, equity, beneficios, rate, tarifa. Especializado en developers senior con experiencia SaaS y trabajo remoto internacional.
xlsx
by samhvw8
"Excel spreadsheet processing and analysis. Formats: .xlsx, .xlsm, .csv, .tsv. Capabilities: create spreadsheets, formulas (error-free), formatting, data analysis, charts, pivot tables, conditional formatting, data validation, template preservation. Actions: create, edit, analyze, visualize, recalculate spreadsheets. Keywords: Excel, spreadsheet, xlsx, csv, formula, VLOOKUP, SUMIF, pivot table, chart, graph, data analysis, formatting, conditional formatting, data validation, workbook, worksheet, cell reference, named range, macro. Use when: creating spreadsheets, editing Excel files, analyzing tabular data, building formulas, creating charts/graphs, working with CSV/TSV, preserving spreadsheet templates."
extended-thinking
by vanman2024
Deep reasoning with Claude's extended thinking feature for complex multi-step problems. Use when implementing think-aloud reasoning, complex analysis, or debugging difficult issues.
linkedin-mastery
by founderjourney
Sistema completo para optimizar perfiles LinkedIn de desarrolladores senior (IC). Usar cuando el usuario necesite optimizar su perfil LinkedIn, escribir headlines, about sections, descripciones de experiencia laboral, o convertir proyectos tecnicos en narrativas que comuniquen senioridad. Activa con palabras como LinkedIn, perfil, headline, about, experiencia, CV, reclutadores, posicionamiento profesional, branding personal developer. Especializado en Senior Individual Contributors (IC) del mundo tech/SaaS.
saas-financial-projections
by founderjourney
Senior SaaS CFO / Financial Analyst (15+ years) specialized in financial modeling, projections, and exit strategy for bootstrapped and VC-backed SaaS companies. Activate when user needs: (1) Revenue projections (1-5 years), (2) Exit valuation and multiples, (3) Unit economics analysis (CAC, LTV, payback), (4) Scenario modeling (conservative/base/optimistic), (5) Fundraising narratives with financial backing, (6) M&A due diligence financials, (7) SaaS metrics benchmarking, (8) Cohort analysis and churn modeling. Triggers: "proyecciones", "projections", "exit", "valuation", "ARR", "MRR", "multiples", "revenue forecast", "financial model", "exit strategy", "CAC", "LTV", "unit economics", "churn", "fundraising", "M&A", "acquisition", "5 year plan".
geopandas
by tondevrel
Open source project to make working with geospatial data in python easier. Extends the datatypes used by pandas to allow spatial operations on geometric types. Built on top of Shapely, Fiona, and Pyproj. Use for reading and writing spatial formats (Shapefile, GeoJSON, GeoPackage, KML), performing spatial joins, coordinate system transformations (reprojecting), geometric analysis (buffers, centroids, convex hulls), thematic mapping (Choropleth maps), calculating spatial relationships (contains, overlaps, touches, within), working with OpenStreetMap data or satellite-derived vector data.
analyzing-code
by iota9star
Analyzes code statistics by language for project insight, CI/CD metrics, or before refactoring. Use this skill when understanding project composition, measuring change impact, or generating CI/CD metrics