✦ SkillGalaxy — Claude Skills Marketplace

The free, open marketplace of .md skill files for Claude Projects.
Download once. Claude applies it automatically in every conversation. Forever.

---

What is SkillGalaxy?

Every time you start a new Claude conversation, you re-explain the same instructions. Copy-paste. Again and again.

SkillGalaxy fixes that.

It's a community-powered library of .md skill files designed for Claude Projects. Add a skill once to your project instructions — Claude applies it automatically in every conversation from that point forward.

No repeated prompts. No wasted tokens. Just results.

---

How It Works

1. Browse SkillGalaxy → find a skill
2. Click Download .md
3. Open Claude → go to a Project → paste into Project Instructions
4. Done. Claude applies the skill in every conversation automatically.

No account needed to download. No friction.

---

Stats

Skills	10,171+ and growing
Domains	16
Price	Free. Always.
Model	Community-built, reviewed within 24hrs

---

Domains Covered

AI & ML · Cybersecurity · Data Engineering · Cloud & Infra · Quantum Computing · Computational Biology · Spatial Computing · Blockchain & Web3 · Robotics & Automation · Climate Tech · Product & Strategy · Creative Technology · Development · Writing · Business · Design & Education

---

What's New

Skill Ratings & Reviews

Every skill now has a 1–5 star rating widget. Open any skill → scroll to Rate this Skill → leave a rating and optional review. Average scores and recent reviews load dynamically from Supabase.

AI-Powered Skill Validator

Community submissions are automatically scored by Claude (claude-haiku) on submit. Skills receive a quality score (1–10) with actionable feedback. Requires ANTHROPIC_API_KEY in your Vercel environment — see AI Validator Setup.

One-Click "Connect Claude Desktop" Button

Click ** Connect Claude Desktop** in the hero to get a ready-to-copy claude_desktop_config.json snippet that wires the SkillGalaxy MCP server directly into Claude Desktop.

Skill Versioning

Skills now carry a version (semver) and changelog field. Contributors can bump the version when they update a skill — users see "Updated X days ago" and the version in the skill detail modal.

⚡ SkillForge Composer — Evolutionary Skill Graph Optimizer

The most advanced skill composition engine in the ecosystem. Instead of naively concatenating skills, SkillForge:

1. Builds a synergy graph — models all skills as nodes, edges represent shared tags, category alignment, and proven composition synergies
2. Runs evolutionary optimization — genetic algorithm (selection → crossover → mutation → pruning) discovers optimal skill subgraphs
3. Prunes overlapping content — detects and removes redundant instructions between composed skills
4. Generates forged composites — outputs a single .md file with merged context, provenance tracking, and token budget

Benchmark results (100 skills, 50 queries):

Metric	Baseline (Top-K)	SkillForge	Delta
Avg Tokens	~4,800	~3,200	-33%
Success Rate	0.78	0.89	+14pp
Latency	O(N)	O(G×P×E)	<500ms

Access via:

• Frontend: Click "⚡ Forge Composer" in the sidebar
• API: POST /api/skillforge-compose with { query, skillSummaries }
• MCP: forge_composite tool (10th tool in MCP v2.0)

# Run the benchmark simulation
python3 scripts/skillforge_benchmark.py

---

MCP Server v2.0 — One-Toggle Claude Connection

Connect Claude directly to the entire SkillGalaxy library via Model Context Protocol. No manual downloads needed.

cd mcp-server && npm install && npm run build-skills

Claude Desktop (stdio)

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json):

{
  "mcpServers": {
    "skillgalaxy": {
      "command": "node",
      "args": ["/path/to/skill_galaxy/mcp-server/index.js"]
    }
  }
}

Restart Claude Desktop — done. Claude can now search, compose, visualise, and orchestrate all 10,171+ skills.

Remote Clients (Streamable HTTP)

npm run start:http                          # http://localhost:3100/mcp
MCP_API_KEY=secret npm run start:http       # with bearer auth

10 Tools Available

Tool	Description
search_skills	Search by keyword/category/difficulty (L1 metadata only)
get_skill	Load full markdown body (L2)
get_skill_deep	Full body + related skills + cross-references (L3)
get_skill_summary	Compact metadata table
list_categories	Browse all 16 categories
execute_skill_code	Code Mode — run JS pipelines server-side (~37% token savings)
compose_skills	Chain skills into workflows with reflection
generate_visual	Mermaid diagrams, comparison tables, dashboards
ingest_file	Process PDFs, CSVs, XLSX, images natively
forge_composite	SkillForge — evolutionary graph optimization for optimal skill compositions

v2.0 Features

• Progressive Disclosure — 3-level loading keeps context minimal
• Code Mode — orchestrate multiple tools in one call, reducing token usage
• Composable Workflows — chain skills with optional self-reflection
• Generative UI — Mermaid diagrams, learning paths, category dashboards
• Security — input sanitisation, rate limiting, audit logging
• Binary Ingestion — PDF, CSV, XLSX, image processing
• SkillForge — evolutionary skill graph composition with token pruning
• Streamable HTTP — remote access with bearer auth

👉 Full MCP setup guide →

---

AI Validator Setup

The AI validator scores submitted skills automatically using Claude Haiku.

1. Get an Anthropic API key
2. In your Vercel project → Settings → Environment Variables → add:

   ANTHROPIC_API_KEY = sk-ant-...
   

3. Redeploy. Done. The /api/validate-skill endpoint becomes active.

Without the key the validator is silently skipped — submissions still work normally.

---

Database Migrations

After cloning and running supabase-setup.sql, run the migration to enable ratings, reviews, and versioning:

-- In Supabase Dashboard → SQL Editor:
-- Run: supabase-migrations.sql

This adds:

• skill_reviews table (1 review per user per skill, star rating + text)
• version + changelog columns on both skills and community_skills
• upsert_skill_review(), get_skill_reviews(), get_skill_rating() RPC functions

SkillForge Schema

-- In Supabase Dashboard → SQL Editor:
-- Run: supabase-skillforge.sql

This adds:

• skill_composites table (forged composite skills with provenance + token metrics)
• skill_graph_edges table (synergy/overlap edges between skill pairs)
• mv_popular_skill_pairs materialized view (top co-used skill pairs)
• upsert_graph_edge(), get_top_composites() RPC functions

---

Project Structure

skill_galaxy/
├── index.html              # Main app shell
├── guide.html              # Skill creation guide
├── css/
│   └── styles.css          # All styles — Claude-inspired theme
├── js/
│   ├── config.js           # Supabase client config + environment setup
│   ├── db.js               # Skills database (208 hardcoded + 9,872 from Supabase)
│   ├── skills-api.js       # Supabase CRUD: community skills, ratings, reviews
│   ├── auth.js             # Supabase Auth (login, signup, session)
│   ├── app.js              # Frontend logic: render, filter, modals, download, ratings
│   └── icon_renderer.js    # Simple Icons + emoji icon rendering
├── api/
│   └── validate-skill.js   # Vercel serverless AI validator (Anthropic API)
├── mcp-server/             # MCP server v2.0 for Claude integration
│   ├── index.js            # Stdio transport (9 tools, Code Mode, Progressive Disclosure)
│   ├── server-http.js      # Streamable HTTP transport (Express, bearer auth, sessions)
│   ├── skills-data.js      # Auto-generated skills module (10,171 skills)
│   └── README.md           # MCP v2.0 setup instructions
├── supabase-setup.sql      # Base database schema
├── supabase-migrations.sql # Ratings, reviews, versioning migration
├── supabase-skillforge.sql # SkillForge: composites + graph edges tables
├── scripts/
│   └── skillforge_benchmark.py  # Python benchmark: evolutionary vs. baseline
├── SETUP_GUIDE.md          # Full local setup instructions
└── README.md

---

Contributing a Skill

1. Go to skill-galaxy.vercel.app
2. Sign in → click Submit a Skill
3. Fill in the form or upload a .md file following the Skill Format Guide
4. Your skill goes live within 24 hours after review

Skill .md format (minimum required frontmatter):

---
name: my-skill-name
description: What this skill does and when Claude should apply it.
version: 1.0.0
---

## Skill Content

Your instructions for Claude go here.

Attribution: Your name + profile link appears on every skill card. Contributors retain full ownership — SkillGalaxy is a distribution platform, not a rights holder. You can remove your skill at any time.

---

Tech Stack

• Frontend: Pure HTML, CSS, JavaScript — no frameworks, no build tools
• Backend: Supabase (Postgres + REST API + RLS)
• Hosting: Vercel (static files + serverless API routes)
• Auth: Supabase Auth (email + password)
• AI: Anthropic claude-haiku (optional skill validator)

---

SkillForge (Beta)

SkillForge is an evolutionary skill composer that automatically combines multiple skills into optimized composites, with token savings via overlap pruning and synergy-aware selection.

How It Works

1. Open SkillForge (⚡ button in header)
2. Describe your workflow (e.g., "build ML pipeline with security")
3. SkillForge runs genetic algorithm client-side
4. Returns optimized composite + token savings metrics

API Endpoints

Endpoint	Method	Description
/api/skillforge	POST	Generate new skill from description
/api/skillforge-compose	POST	Compose skills into composite
/api/forge	GET	Lattice query with token budget

Algorithm

• Relevance: TF-IDF cosine similarity to query
• Synergy: Graph edges from shared tags + category
• Fitness: α·relevance + β·(1-token_penalty) + γ·synergy
• Pruning: Overlap removal via desc similarity

Benchmark Results

Avg Tokens:  4,820 → 1,340 (72% savings)
Accuracy:   +11% via synergy-aware selection

---

License

Apache 2.0 — free to use, fork, and modify with attribution.
All skill files are free to use, share, and adapt.

---

Built by Timps

timps-website.vercel.app · Product Hunt

If SkillGalaxy is useful to you, consider ⭐ starring the repo and upvoting on Product Hunt — it genuinely helps.