Free Claude Skills.

Create distinctive, production-grade frontend interfaces with high design quality. Use when building web components, pages, artifacts, posters, or applications. Generates creative, polished UI code that avoids generic AI aesthetics.

Read, write, split, merge, rotate, watermark, encrypt and OCR PDF files. Use whenever the user mentions a .pdf file or wants to produce one. Includes pypdf, pdfplumber, reportlab and command-line workflows.

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Supports Python (FastMCP) and Node/TypeScript (MCP SDK).

Create new skills, modify existing skills, run evals, benchmark performance, and optimize a skill's description for better triggering accuracy. The meta-skill for building SKILL.md skills.

Create, edit and extract content from Microsoft Word (.docx) files. Use whenever the user works with .docx documents, asks to produce a Word file, or needs to manipulate document structure, styles, or tracked changes.

Read, write, and analyse Microsoft Excel (.xlsx) files. Use whenever the user mentions a .xlsx file, asks to produce a spreadsheet, or wants to read/write cells, formulas, sheets, or formatting.

Create distinctive, production-grade frontend interfaces with high design quality. Use when building web components, pages, artifacts, posters, or applications. Generates creative, polished UI code that avoids generic AI aesthetics.

Read, write, split, merge, rotate, watermark, encrypt and OCR PDF files. Use whenever the user mentions a .pdf file or wants to produce one. Includes pypdf, pdfplumber, reportlab and command-line workflows.

Guide for creating high-quality MCP (Model Context Protocol) servers that enable LLMs to interact with external services through well-designed tools. Supports Python (FastMCP) and Node/TypeScript (MCP SDK).

Create new skills, modify existing skills, run evals, benchmark performance, and optimize a skill's description for better triggering accuracy. The meta-skill for building SKILL.md skills.

Create, edit and extract content from Microsoft Word (.docx) files. Use whenever the user works with .docx documents, asks to produce a Word file, or needs to manipulate document structure, styles, or tracked changes.

Read, write, and analyse Microsoft Excel (.xlsx) files. Use whenever the user mentions a .xlsx file, asks to produce a spreadsheet, or wants to read/write cells, formulas, sheets, or formatting.

Build self-contained interactive web artifacts (single-file HTML+CSS+JS apps) like calculators, visualisers, mini-tools and demos. Use when the user wants a runnable web artifact rather than a full project.

Use the Claude API effectively: messages endpoint, streaming, tool use, vision, prompt caching, batches, files. Use when the user is building against the Anthropic API or troubleshooting requests.

Systematically debug failing code: form hypotheses, isolate variables, add targeted logging, run minimal reproductions. Use when the user is stuck on a bug.

Collection of 20+ general-purpose skills by Jesse Vincent (obra) for thinking clearly, debugging, refactoring, planning, writing tests, and shipping code. The most popular community skill bundle.

Drive headless and headed browsers with Playwright: navigate, fill forms, take screenshots, scrape, and run end-to-end tests. Use whenever the user wants to automate a browser.

Build interactive data visualisations with D3.js: bar charts, line charts, scatter plots, geographic maps, force-directed graphs. Use when the user wants custom, code-driven charts beyond Chart.js.

Bundle of scientific computing skills: numerical methods, statistics, plotting with matplotlib, scientific Python (numpy, scipy, pandas). Use when the user is doing research, analysis, or simulation.

Critical-thinking adversarial reviewer skill. Use when you want Claude to deliberately stress-test a plan, design, or argument and surface the weakest links.

Security engineering skills from Trail of Bits: cryptography review, secure code review, blockchain audit patterns, threat modeling. Use when the user wants serious security analysis.

Use shadcn/ui components correctly in Next.js / React projects: install the right primitives, follow the radix patterns, theme via CSS variables. Use when the user is building a polished React app.

Cut through ambiguity and push a task to completion. Use when a conversation is going in circles, scope is bloating, or the user explicitly wants to wrap something up fast.

Build with the Next.js App Router: server components, route handlers, server actions, streaming, middleware, layouts. Use when the user works on a Next.js 13+ project.

Build and deploy Cloudflare Workers / Pages: Hono routing, D1 SQLite, KV, R2, Durable Objects, secrets, wrangler. Use when the user is on the Cloudflare edge.

Run a thorough technical SEO audit on a website: meta titles, descriptions, canonicals, sitemap, structured data, internal linking, Core Web Vitals. Use when the user wants to improve organic traffic.

Perform a thoughtful code review: correctness, readability, performance, security, tests. Use when the user pastes a diff or PR and wants critical feedback.

Design and iterate on prompts and prompt templates with structured testing. Use when the user is shipping a feature that depends on LLM behaviour and needs reliable outputs.

Create and edit PowerPoint (.pptx) presentations. Use when the user mentions a .pptx file, asks to build a slide deck, or needs to manipulate slides, layouts, or speaker notes.

Design visual canvases including posters, social cards, illustrations, and graphics using HTML/CSS/SVG. Use when the user asks for visual design output other than code-driven web UIs.

Generate algorithmic and generative art with HTML5 Canvas, SVG, p5.js patterns and shaders. Use when the user wants creative coding, generative visuals, or mathematical art.

Generate cohesive design themes (color palettes, typography, spacing scales) and apply them as design tokens across a codebase. Use when the user wants to rebrand, retheme, or unify styling.

Apply and enforce brand guidelines across designs and content: voice, tone, color, type, logo placement, and asset rules. Use when the user references a brand, style guide, or visual identity.

Author end-to-end and integration tests for web applications using Playwright, Cypress and the like. Use when the user wants to add tests, debug flaky behaviour, or set up CI test pipelines.

Collaboratively write, edit and structure long-form documents (specs, RFCs, papers, reports) with attention to clarity, tone and consistency. Use when the user is drafting or revising long-form prose.

Draft clear, well-structured internal communications: announcements, change docs, status updates, post-mortems. Use when the user is writing to colleagues, teams, or leadership.

Create small, looping animated GIFs suitable for Slack reactions and emoji using HTML/CSS animation captured to GIF. Use when the user wants a custom Slack reaction or emoji.

Run safe, idiomatic git operations: rebases, interactive rebase, cherry-picks, conflict resolution, bisect, history rewriting. Use when the user is debugging a tricky git situation.

Experimental skills lab by obra — early-stage ideas, in-progress skills, and prototypes. Useful if you want to track what's coming next.

Drive the iOS simulator from Claude: launch apps, interact with UI, take screenshots, inspect view hierarchies. Use when building or QAing iOS apps locally.

Run ffuf (fast web fuzzer) to discover hidden endpoints, parameters and virtual hosts on a target. Use when the user is doing authorized web pentesting or content discovery.

Generate favicons, social card images, OG previews, app icons and other web assets from a single source. Use when the user is launching a site or app and needs the standard image set.

Build pixel-perfect HTML/CSS slide decks for technical talks. Use when the user wants a slide deck as code (Reveal.js, Slidev, raw HTML) rather than a .pptx.

Build React Native apps with Expo: navigation, native modules, EAS build pipelines, deployment to App Store and Play Store. Use whenever the user works on a mobile app with Expo.

Design schemas, write performant queries, debug query plans, manage migrations, and operate PostgreSQL safely. Use when the user is working with a Postgres database.

Write TypeScript that satisfies strict mode and noUncheckedIndexedAccess. Use when the user wants type-safe code without `any`, or is migrating a JS project to TS.

Write idiomatic React hooks: dependency arrays, custom hooks, useReducer, useMemo, suspense. Use when the user is working with React functional components.

Rewrite content for clarity, brevity, tone or SEO. Use when the user pastes existing copy and wants it improved, condensed, or repositioned for a different audience.

Draft clear, well-structured emails: outreach, follow-ups, escalations, replies. Use when the user wants help composing email rather than a long-form document.

Generate user-facing changelogs from git history or PR lists. Use when the user is preparing a release and needs human-readable change notes.

Write clear API reference docs and tutorials from OpenAPI specs or source code. Use when the user is launching or maintaining a public API.

Design, debug and explain regular expressions with test cases. Use when the user needs a regex written, understood, or fixed.

Read EXPLAIN plans, find missing indexes, rewrite slow queries, and suggest schema changes. Use when the user has a slow SQL query in any major dialect.

Produce a production-grade Dockerfile and docker-compose setup for an existing project: multi-stage builds, small images, healthchecks, secrets handling.

Author and refactor Terraform/OpenTofu modules. Use when the user is provisioning AWS, GCP, Azure or Cloudflare infrastructure as code.

Write and debug Kubernetes manifests: Deployments, Services, Ingress, ConfigMaps, Secrets, HPA. Use when the user is operating workloads on Kubernetes.

Refactor code safely with small, testable steps: extract function, rename, simplify conditionals, eliminate duplication. Use when the user wants to improve code without changing behaviour.

Clean, reshape and analyse CSV files at speed. Use when the user pastes or attaches a CSV and wants to filter, pivot, join, or compute over it.

Manipulate large JSON files with jq, Python and surgical patches. Use when the user needs to slice, restructure or merge JSON.