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Claude Code is powerful out of the box. But install the right skill, and it stops being a coding assistant and starts being a research team, a marketing department, or an academic lab.

Here are 4 skills that do exactly that - each one free, open-source, and installable in one command.

1. last30days - A Search Engine Scored by Real People

41.5K stars · 3.4K forks · 1,012 tests passing · MIT License

Google aggregates editors. /last30days searches people.

This skill turns Claude into a multi-platform research engine that searches Reddit, X, YouTube, TikTok, Instagram, Hacker News, Polymarket, GitHub, Bluesky, Pinterest, Threads, Perplexity, and the open web - all in parallel. Results are ranked by what real humans actually engage with: upvotes, likes, views, and prediction market odds backed by real money.

An AI judge synthesizes everything into one cited brief. No hallucinations - every claim traces back to a source.

What Makes It Different

  • 14+ platforms searched simultaneously - Reddit threads with top comments, X hot takes, YouTube transcripts from 45-minute deep dives, Polymarket odds, GitHub PR velocity, TikTok creator content, and more
  • Engagement-based scoring - results ranked by upvotes, likes, real-money bets, and views instead of SEO manipulation
  • Intelligent pre-research - resolves entities before searching. Type "OpenClaw" and it automatically finds @steipete, r/openclaw, the right YouTube channels, and related GitHub repos
  • Cross-source cluster merging - same story appearing on Reddit, X, and YouTube gets merged into one cluster instead of three duplicate items
  • Best Takes - a second judge scores for humor, wit, and virality. The cleverest one-liners from across the internet surface in every brief
  • Shareable HTML briefs - self-contained, dark-mode, print-friendly HTML files you can send to anyone
  • Competitor comparisons - --competitors flag auto-discovers top peers and runs parallel research pipelines
  • ELI5 mode - same data, same citations, zero jargon
  • Trend monitoring - --store persists results to SQLite, with scheduled runs and Slack/webhook delivery

Real Use Cases

  • Before a meeting - research someone's recent tweets, podcast appearances, GitHub activity
  • When something drops - track breaking news across all platforms with prediction market odds
  • Compare tools - side-by-side analysis with live community data
  • Learn fast - community-discovered best practices ranked by actual adoption

Install

# Claude Code (recommended)
/plugin marketplace add mvanhorn/last30days-skill
/plugin install last30days

# Any agent (Codex, Cursor, Copilot, Gemini CLI)
npx skills add mvanhorn/last30days-skill -g

Reddit comments work free out of the box. X needs a browser login. YouTube needs brew install yt-dlp. TikTok/Instagram/Threads activate with a ScrapeCreators API key (100 free credits).

GitHub: github.com/mvanhorn/last30days-skill

2. taste-skill - The Anti-Slop Frontend Framework

17.5K stars · 1.5K forks

Every AI-generated frontend looks the same. Rounded corners, soft gradients, the same Tailwind utility soup. It all looks like it was made by the same intern. taste-skill exists to kill that.

This is a framework of 9 code skills + 3 image-generation skills that give Claude actual design taste. Instead of generating generic UI, Claude builds frontends with intentional design decisions - variance, motion, density, typography - controlled by dials you can tune.

The 12 Skills

Code Skills (9):

SkillWhat It Does
tasteCore design system - establishes visual language, spacing, color theory
taste-layoutPage structure with intentional whitespace and grid decisions
taste-motionAnimations that serve a purpose, not just "make it bounce"
taste-typographyType pairing, scale, and hierarchy that doesn't look AI-generated
taste-colorColor systems with actual contrast ratios and mood targeting
taste-componentsUI components built with design opinion, not defaults
taste-responsiveBreakpoints and layouts that actually adapt, not just shrink
taste-accessibilityA11y baked into the design system, not bolted on after
taste-dark-modeDark themes that aren't just "invert the colors"

Image Generation Skills (3):

SkillWhat It Does
taste-heroHero images with composition and focal point control
taste-illustrationIllustrations that match your design language
taste-iconIcon sets with consistent stroke weight and visual rhythm

Design Dials

The key concept: taste-skill gives Claude dials for variance, motion, and density. Low variance = clean corporate. High variance = editorial chaos. You control the aesthetic instead of getting the AI default every time.

Install

npx skills add https://github.com/Leonxlnx/taste-skill

Website: tasteskill.dev GitHub: github.com/leonxlnx/taste-skill

3. marketingskills - 42 Marketing Skills by Corey Haines

31.9K stars · 5.3K forks

One install. 42 marketing skills. Claude goes from "write me a blog post" to a full marketing department that handles CRO, copywriting, SEO, analytics, paid ads, retention, growth engineering, and sales ops.

Built by Corey Haines - the guy behind SwipeFiles and marketing advisor to dozens of SaaS companies.

The Full Skill Map

CategoryCountIncludes
CRO & Experimentation5A/B test design, conversion audit, landing page optimization, funnel analysis, pricing experiments
Content & Copywriting8Blog posts, email sequences, social copy, ad creative, product descriptions, case studies, newsletters, launch copy
SEO6Keyword research, content briefs, technical audit, link strategy, SERP analysis, content refresh
Paid Acquisition3Ad campaign structure, audience targeting, budget allocation
Measurement & Analytics2Attribution modeling, dashboard design
Retention1Churn analysis and win-back campaigns
Growth Engineering3Referral systems, viral loops, product-led growth
Strategy4Go-to-market, positioning, competitive analysis, channel strategy
Sales & RevOps3+Lead scoring, pipeline optimization, outbound sequences

Each skill isn't just a prompt template - it's a structured workflow with specific inputs, analysis steps, and deliverables. The SEO keyword research skill, for example, doesn't just brainstorm keywords. It analyzes search intent, competition difficulty, content gaps, and outputs a prioritized content calendar.

Install

# Claude Code
npx skills add coreyhaines31/marketingskills

# Also works as a Claude Code plugin

Website: marketing-skills.com GitHub: github.com/coreyhaines31/marketingskills

4. academic-research-skills - A 13-Agent Research Lab

1.3K stars · 153 forks · CC-BY-NC 4.0 License

This skill doesn't help you write a paper. It runs an entire academic research pipeline - from literature review to peer review to final publication - using teams of specialized agents that critique, verify, and improve each other's work.

The 4 Skills

1. deep-research - 13 agents, 7 research modes

The research engine. 13 agents work in parallel across modes: literature survey, systematic review, meta-analysis, exploratory research, gap analysis, methodology review, and theoretical framework development. Each agent has a specific role - one searches databases, another evaluates methodology, another identifies contradictions across sources.

2. academic-paper - 12 agents, 9 writing modes

The writing engine. 12 specialized agents handle different aspects of academic writing: abstract generation, introduction framing, methodology description, results presentation, discussion synthesis, conclusion drafting, citation formatting, figure/table creation, and supplementary material. Each section gets drafted, critiqued, and revised before integration.

3. academic-paper-reviewer - 7 agents, 5 review modes

A simulated peer review panel. 7 agents act as reviewers with different expertise profiles. They evaluate methodology, statistical validity, novelty, clarity, and reproducibility. The review produces structured feedback identical to what you'd get from a real journal submission - strengths, weaknesses, and specific revision requests.

4. academic-pipeline - The 10-Stage Orchestrator

This is the full pipeline that chains everything together:

  1. Research - deep-research agents gather and analyze literature
  2. Write - academic-paper agents draft the manuscript
  3. Integrity Check - automated verification of claims, citations, and methodology
  4. Peer Review - 5-person simulated review panel
  5. Socratic Coaching - agents challenge the author's assumptions through dialogue
  6. Revise - address reviewer feedback with tracked changes
  7. Re-Review - second round of peer review on revised manuscript
  8. Re-Revise - final revision pass
  9. Final Integrity Check - last verification sweep
  10. Finalize - publication-ready output

The pipeline catches the kind of errors that slip past human reviewers - citation inconsistencies, methodology gaps, unsupported claims, statistical misinterpretations - because each agent specializes in finding one type of problem.

Install

git clone https://github.com/imbad0202/academic-research-skills.git
cp -r academic-research-skills/skills/* ~/.claude/skills/

GitHub: github.com/imbad0202/academic-research-skills

Quick Comparison

SkillStarsSkillsBest For
last30days41.5K1 (but searches 14+ platforms)Real-time research across social platforms
taste-skill17.5K12 (9 code + 3 image)Frontend design that doesn't look AI-generated
marketingskills31.9K42Full marketing department in one install
academic-research1.3K4 (with 39+ agents total)Academic papers with built-in peer review

How Claude Code Skills Work

If you're new to skills - they're markdown files that give Claude specialized knowledge and workflows for specific tasks. Think of them as expertise packages. Install one, and Claude gains the ability to execute complex multi-step processes that would normally require an expert.

Install any skill:

npx skills add <github-url>

Skills work across Claude Code, Cursor, Codex, Copilot, Gemini CLI, and 50+ other agent hosts. They're just files - no vendor lock-in, no subscriptions, no tracking.

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