Community AI Agent Skills Discovery Sources

Research Date: 2026-03-26 Scope: Platforms, repositories, directories, and communities for discovering and sharing AI agent skills/prompts for Claude Code, Codex, Gemini CLI, GitHub Copilot, Cursor, Windsurf, OpenCode, and similar tools.

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Table of Contents

1. Package Managers and CLIs
2. Dedicated Skill Marketplaces (Web)
3. Official Vendor Repositories
4. GitHub Awesome Lists and Collections
5. Cross-Platform Rule/Prompt Directories
6. GitHub Discovery Patterns
7. Community Hubs
8. API and Programmatic Access
9. Open Standard: Agent Skills Specification
10. Summary Matrix

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1. Package Managers and CLIs

1.1 skills.sh / Vercel Skills CLI

• URL: https://skills.sh
• GitHub: https://github.com/vercel-labs/skills
• Type: Package manager + browsable directory/leaderboard
• Content: Agent skills in SKILL.md format
• Launched: January 20, 2026 by Vercel
• Scale: 90,000+ total installations tracked; leaderboard of most popular skills
• Supported Agents: 20+ including Claude Code, GitHub Copilot, Cursor, Cline, Gemini CLI, VS Code, OpenCode, Windsurf
• Installation: npx skills add <owner/repo> or npx skills add <owner/repo> --skill <name>
• CLI Commands:
  • npx skills find [query] -- search for skills
  • npx skills add <package> -- install a skill
  • npx skills list -- list installed skills
  • npx skills check -- check for updates
  • npx skills update -- update installed skills
  • npx skills init -- create a new SKILL.md template
• Browsing: Web directory at skills.sh with full-text search, sorting by All Time / Trending (24h) / Hot
• API/Programmatic: CLI-based search via npx skills find; no documented REST API
• Quality: Community-submitted; leaderboard surfacing popular skills
• Assessment: The ecosystem's primary package manager and central hub. Best starting point for discovery.

1.2 Anthropic Claude Code Plugin System

• Docs: https://code.claude.com/docs/en/plugin-marketplaces
• Type: Built-in plugin marketplace infrastructure in Claude Code CLI
• Content: Plugins that bundle skills, MCP servers, hooks, commands, and subagents
• How it Works: Any GitHub repository can serve as a plugin marketplace; Claude Code fetches and installs from them
• Installation: /plugin marketplace add <owner/repo> then /plugin install <name>@<marketplace>
• Key Marketplaces:
  • anthropics/claude-plugins-official -- Anthropic-managed, high-quality plugins
  • anthropics/skills -- Official Anthropic skills
  • rohitg00/awesome-claude-code-toolkit -- 135 agents, 35 skills, 42 commands, 150+ plugins
  • davepoon/buildwithclaude -- 53 plugins, 121 skills, 117 subagents, 175 commands, 28 hooks
  • alirezarezvani/claude-skills -- 192+ skills for 11 coding agents
• Quality: Varies by marketplace; official Anthropic marketplace is curated
• Assessment: Native integration is powerful. The decentralized marketplace model means many sources to discover.

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2. Dedicated Skill Marketplaces (Web)

2.1 SkillsMP (skillsmp.com)

• URL: https://skillsmp.com
• Type: Aggregator marketplace
• Content: Agent skills for Claude Code, Codex CLI, ChatGPT
• Scale: 500,000+ skills (aggregated from GitHub)
• Browsing: Smart search, category filtering, quality indicators
• Categories: https://skillsmp.com/categories -- Debugging, Productivity, System Administration, Automation, IDE, CLI tools, LLM/AI, and more
• Quality: Filters repos with <2 stars; scans for basic quality. User should review code before installing
• Format: Open SKILL.md standard
• API/Programmatic: MCP server available at mcpmarket.com/server/skillsmp; also has a LobeHub skillsmp-downloader
• Assessment: Largest aggregator by count. Good for broad discovery but quality varies significantly.

2.2 SkillHub (skillhub.club)

• URL: https://www.skillhub.club
• Type: Marketplace with creation framework
• Content: Skills for Claude, Codex, Gemini, OpenCode
• Scale: 7,000+ AI-evaluated skills
• Browsing: Browse by category, search, copy SKILL.md with one click
• Installation: Copy SKILL.md to ~/.claude/skills/, or use Desktop app for one-click install
• Quality: AI-evaluated quality scoring
• Assessment: Mid-size marketplace with good tooling for skill creation.

2.3 claude-plugins.dev

• URL: https://claude-plugins.dev
• Type: Auto-indexed community registry with CLI
• Content: Agent skills from across GitHub
• Scale: 51,625+ skills indexed
• Browsing: Search, download tracking, category filtering
• Supported Agents: Claude, Cursor, OpenCode, Codex, and more
• Quality: Auto-indexed from public GitHub repos; open-source, community-maintained
• Assessment: Large auto-indexed directory. Good for breadth of discovery.

2.4 ClaudeSkills.info

• URL: https://claudeskills.info
• Type: Curated marketplace
• Content: Claude Code skills and agent skills
• Scale: 140+ free, open source skills
• Browsing: Browse by category (development, testing, creative design, security, productivity); click card to view GitHub details
• Quality: Curated; organizes high-quality skills from various sources
• Assessment: Smaller but more curated. Good starting point for hand-picked quality skills.

2.5 ClaudeSkillsMarket (claudeskillsmarket.com)

• URL: https://www.claudeskillsmarket.com
• Type: Marketplace for discovering, sharing, and building skills
• Content: Claude AI skills
• Assessment: Another community marketplace in the growing ecosystem.

2.6 ClaudeSkills.ai

• URL: https://claudeskills.ai
• Type: Marketplace for Claude AI skills
• Assessment: Community marketplace.

2.7 TonsOfSkills (tonsofskills.com)

• URL: https://tonsofskills.com
• Type: Skills hub with one-click downloads
• Content: 2,787 searchable skills; 416 plugins with embedded agent skills
• Browsing: Fuzzy search and filters; interactive tutorials
• Features: Integration packs for Supabase, Vercel, Sentry (24-30 skills each)
• Quality: Open source, production-ready; weekly updates
• Assessment: Notable for platform-specific integration packs.

2.8 LobeHub Skills Marketplace

• URL: https://lobehub.com/skills
• Type: Marketplace for SKILL.md format skills
• Content: Agent skills compatible with Claude Code, Codex CLI, ChatGPT
• Browsing: Category filtering, curated collections
• Features: Skill collections grouped by theme/intent
• Assessment: Part of the broader LobeHub ecosystem; good collection-based discovery.

2.9 Awesome-Skills.com

• URL: https://awesome-skills.com
• Type: Curated directory
• Content: 128+ curated skills and plugins for Claude Code
• Categories: Tooling, data agents, automation, workflow, AI integration, planning, design, content, UI, research, testing, devops, marketing, documents, security, architecture
• Assessment: Small but curated. Updated regularly.

2.10 AwesomeSkills.dev

• URL: https://www.awesomeskills.dev/en
• Type: Curated atlas / directory
• Content: Agent skills for Claude Code, Codex, and Cursor
• Features: One-line install commands; organized by intent and platform
• Assessment: Web frontend for the VoltAgent/awesome-agent-skills repo.

2.11 ClaudeMarketplaces.com

• URL: https://claudemarketplaces.com
• Type: Curated directory of plugins, skills, and MCP servers
• Content: Hand-picked extensions with proven adoption (500+ installs)
• Quality: Filters by install count, GitHub stars, community votes
• Features: Community upvote/downvote system
• Assessment: Quality-focused curation. Good for finding battle-tested tools.

2.12 SkillsDirectory.com

• URL: https://www.skillsdirectory.com
• Type: Security-focused skills directory
• Content: Verified, security-tested agent skills for Claude AI
• Quality: Every skill scanned for malware, prompt injection, credential theft; manually reviewed
• Features: Security grades; notes that 36% of skills in the wild have security flaws
• Assessment: Unique security focus. Important for enterprise or security-conscious users.

2.13 MCP Market (Skills Section)

• URL: https://mcpmarket.com/tools/skills
• Type: Agent skills directory (part of broader MCP server directory)
• Content: Skills for Claude.ai, Claude Code, Codex, ChatGPT
• Browsing: Category browsing, daily top skills lists
• Scale: 2,000+ pages of skills
• Assessment: Very large directory. Also covers MCP servers.

2.14 AwesomeClaude.ai

• URL: https://awesomeclaude.ai
• Type: Visual directory
• Content: Claude Code tools, workflows, integrations from awesome lists
• Assessment: Visual/enhanced browsing interface for awesome-claude-code collection.

2.15 BuildWithClaude.com

• URL: https://buildwithclaude.com
• Type: Plugin marketplace aggregator
• GitHub: https://github.com/davepoon/buildwithclaude
• Content: 53 plugins, 121 skills, 117 subagents, 175 commands, 28 hooks
• Installation: /plugin marketplace add davepoon/buildwithclaude
• Assessment: Usable directly as a Claude Code plugin marketplace.

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3. Official Vendor Repositories

3.1 Anthropic (anthropics/skills)

• URL: https://github.com/anthropics/skills
• Type: Official Anthropic skills repository
• Content: Reference skills demonstrating creative, technical, and enterprise workflows
• Scale: Official curated set (document handling, design, web artifacts, MCP builders, etc.)
• License: Apache 2.0 or proprietary
• Installation: Register as plugin marketplace via /plugin marketplace add in Claude Code
• Assessment: The reference implementation. High quality, official.

3.2 Anthropic (anthropics/claude-plugins-official)

• URL: https://github.com/anthropics/claude-plugins-official
• Type: Official Anthropic-managed plugin directory
• Content: High-quality Claude Code plugins (including Discord, etc.)
• Assessment: Official, curated, high trust.

3.3 OpenAI (openai/skills)

• URL: https://github.com/openai/skills
• Type: Official Codex skills catalog
• Scale: ~35 curated skills; 13,000 stars, 726 forks
• Organization: Three tiers -- System (bundled), Curated, Experimental
• Installation: Use $skill-installer inside Codex for curated/experimental skills
• Assessment: Official Codex skills. Cross-compatible via SKILL.md standard.

3.4 Google (google-gemini/gemini-skills)

• URL: https://github.com/google-gemini/gemini-skills
• Type: Official Gemini skills repository
• Content: Skills for Gemini API, SDK, and agent interactions
• Assessment: Official Google skills. Compatible with Gemini CLI and Antigravity.

3.5 GitHub (github/awesome-copilot)

• URL: https://github.com/github/awesome-copilot
• Type: Official GitHub community collection
• Content: Skills, custom agents, instructions, and prompts for GitHub Copilot
• Assessment: Official GitHub-maintained community collection.

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4. GitHub Awesome Lists and Collections

4.1 hesreallyhim/awesome-claude-code (32.7k stars)

• URL: https://github.com/hesreallyhim/awesome-claude-code
• Content: Skills, hooks, slash-commands, agent orchestrators, applications, plugins, CLAUDE.md files, status lines, alternative clients
• Categories: 8 main sections covering the full Claude Code ecosystem
• Assessment: The largest and most comprehensive awesome list for Claude Code specifically.

4.2 VoltAgent/awesome-agent-skills (12.9k stars)

• URL: https://github.com/VoltAgent/awesome-agent-skills
• Web: https://www.awesomeskills.dev/en
• Content: 1,000+ agent skills from official dev teams and community
• Organization: By team/company (Anthropic, Vercel, Cloudflare, Google, Stripe, Netlify, etc.)
• Supported Agents: Claude Code, Codex, Antigravity, Gemini CLI, Cursor, Copilot, OpenCode, Windsurf
• Assessment: Best cross-platform skills directory. Organized by vendor which is useful for finding official integrations.

4.3 travisvn/awesome-claude-skills

• URL: https://github.com/travisvn/awesome-claude-skills
• Content: Curated list of skills, resources, and tools
• Assessment: Well-maintained curated list focused on Claude Skills specifically.

4.4 ComposioHQ/awesome-claude-skills

• URL: https://github.com/ComposioHQ/awesome-claude-skills
• Content: Curated skills and tools for Claude AI workflows
• Assessment: From the Composio team; includes their integration skills.

4.5 rohitg00/awesome-claude-code-toolkit

• URL: https://github.com/rohitg00/awesome-claude-code-toolkit
• Content: 135 agents, 35 skills (+400,000 via SkillKit), 42 commands, 150+ plugins, 19 hooks, 15 rules, 7 templates, 8 MCP configs
• Installation: Usable as plugin marketplace via /plugin marketplace add rohitg00/awesome-claude-code-toolkit
• Assessment: Most comprehensive all-in-one toolkit. Both a reference and an installable marketplace.

4.6 alirezarezvani/claude-skills

• URL: https://github.com/alirezarezvani/claude-skills
• Content: 192+ production-ready skills and agent plugins
• Supported Agents: Claude Code, Codex, Gemini CLI, Cursor, and 8 more
• Domains: Engineering, marketing, product, compliance, C-level advisory
• Installation: /plugin marketplace add alirezarezvani/claude-skills
• Assessment: Large cross-platform collection with unusual breadth into non-engineering domains.

4.7 alirezarezvani/claude-code-skill-factory

• URL: https://github.com/alirezarezvani/claude-code-skill-factory
• Content: Toolkit for building and deploying skills, agents, slash commands, and LLM prompts at scale
• Assessment: Meta-tool for skill creation, not a skill collection itself.

4.8 jqueryscript/awesome-claude-code

• URL: https://github.com/jqueryscript/awesome-claude-code
• Content: Tools, IDE integrations, frameworks, and resources for Claude Code
• Assessment: Broader focus including IDE and framework integrations.

4.9 Slash Command Collections

Repository	Content
qdhenry/Claude-Command-Suite	216+ slash commands, 12 skills, 54 agents
wshobson/commands	57 production-ready commands (15 workflows, 42 tools)
artemgetmann/claude-slash-commands	Collection of useful slash commands
hikarubw/claude-commands	Custom slash commands for Claude Code
hiteshbedre/claude-custom-slash-commands	Custom slash commands

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5. Cross-Platform Rule/Prompt Directories

These sources contain prompts/rules for other AI tools that can be adapted to SKILL.md format.

5.1 Cursor Directory (cursor.directory)

• URL: https://cursor.directory
• GitHub: https://github.com/kiliczsh/cursor.directory
• Type: Community hub for Cursor rules and MCP integrations
• Scale: 48,000+ developer community; 250k+ monthly visits; 3.6k GitHub stars
• Browsing: By framework, language, or tech stack; full-text search
• Features: AI-powered rule generator (input your tech stack, get a tailored .cursorrules file)
• MCP Integrations: Dozens of MCP server integrations
• Quality: Community-curated
• Assessment: Largest Cursor rules directory. Rules can be adapted to SKILL.md format.

5.2 dotcursorrules.com

• URL: https://dotcursorrules.com
• Type: Directory for .cursorrules files
• Browsing: By framework/language; submit your own or upvote favorites
• Assessment: Another major Cursor rules directory.

5.3 cursorrules.org

• URL: https://cursorrules.org
• Type: Rule creation platform with CLI tools
• Features: Visual Rule Builder, validation, GitHub/GitLab deployment
• Assessment: More focused on rule creation than browsing.

5.4 Cursor Marketplace

• URL: https://cursor.com/marketplace
• Type: Official Cursor marketplace (launched Feb 2026 with Cursor 2.5)
• Content: Plugins bundling MCP servers, skills, subagents, hooks, rules
• Partners: Figma, Linear, Stripe, AWS, Cloudflare, Vercel, Databricks, Snowflake, Amplitude, Hex
• Assessment: Official Cursor marketplace. New but growing rapidly with major partners.

5.5 awesome-cursorrules

• URL: https://github.com/PatrickJS/awesome-cursorrules
• Type: Curated .cursorrules collection
• Assessment: Established awesome list for Cursor rules.

5.6 instructa/ai-prompts

• URL: https://github.com/instructa/ai-prompts
• Type: Cross-platform prompt collection
• Content: Curated AI prompts for Cursor Rules, Cline, Windsurf, and GitHub Copilot
• Features: Instructions for configuring each platform
• Assessment: Best single source for cross-platform prompts that work across tools.

5.7 Windsurf Rules

• GitHub Topic: https://github.com/topics/windsurf-rules
• File Paths: .windsurf/rules/, .windsurfrules
• Assessment: Growing collection of Windsurf-specific rules on GitHub.

5.8 GitHub Copilot Instructions

• File Path: .github/copilot-instructions.md
• Official Docs: VS Code support for Agent Skills (VS Code 1.108+)
• Skill Paths: ~/.copilot/skills/, .github/skills/, .claude/skills/ (shared with Claude Code)
• Assessment: Copilot now supports the SKILL.md standard natively.

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6. GitHub Discovery Patterns

6.1 Key GitHub Topics

Topic	Repositories
claude-skills	1,554 repos
claude-code	Active
claude-code-skills	Active
claude-code-plugins	Active
agent-skills	Active
codex-skills	Active
gemini-skills	Active
cursor-skills	Active
awesome-claude-code	Active
anthropic-skills	Active
windsurf-rules	Active
windsurf-ai	Active

6.2 Effective GitHub Search Queries

# Find SKILL.md files
path:SKILL.md language:markdown

# Find Claude Code skills directories
path:.claude/skills/ SKILL.md

# Find Codex/cross-platform skills
path:.agents/skills/ SKILL.md

# Find Claude Code commands (legacy format)
path:.claude/commands/ language:markdown

# Find Gemini skills
path:.gemini/skills/ SKILL.md

# Find Copilot skills
path:.github/skills/ SKILL.md

# Find Cursor rules
filename:.cursorrules

# Find Windsurf rules
path:.windsurf/rules/ OR filename:.windsurfrules

# Find Copilot instructions
filename:copilot-instructions.md

# Find skill collections
"awesome" "claude skills" in:name,description

# Find skill repositories by topic
topic:claude-skills stars:>10
topic:agent-skills stars:>10

6.3 Common File Paths Where Skills Are Stored

Path	Platform	Notes
.claude/skills/<name>/SKILL.md	Claude Code	Recommended modern format
.claude/commands/<name>.md	Claude Code	Legacy slash commands
~/.claude/skills/	Claude Code	User-scoped
.agents/skills/<name>/SKILL.md	Codex, cross-platform	Cross-platform standard
~/.agents/skills/	Codex	User-scoped
/etc/codex/skills/	Codex	Admin-scoped
.gemini/skills/<name>/SKILL.md	Gemini CLI	Google's implementation
~/.gemini/skills/	Gemini CLI	User-scoped
.github/skills/<name>/SKILL.md	GitHub Copilot	Copilot support
~/.copilot/skills/	GitHub Copilot CLI	User-scoped
.cursor/rules/	Cursor	Rules directory
.windsurf/rules/	Windsurf	Rules directory
.github/copilot-instructions.md	GitHub Copilot	Single-file instructions

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7. Community Hubs

7.1 Reddit

Community	Members	Focus
r/ClaudeAI	612k	Claude and Claude Code discussion
r/ClaudeCode	96k	Claude Code enthusiasts build/share/solve

7.2 Discord

• Official Claude Discord: https://discord.com/invite/6PPFFzqPDZ (75,000+ members)
• Claude Code Channels feature allows controlling Claude Code sessions from Discord

7.3 Developer Blogs and Content Hubs

Platform	Notable Content
DEV.to	Frequent Claude Code skills tutorials and "best of" roundups
Medium	Active Claude skills community (All About Claude publication, etc.)
Composio Blog	Skills guides and top-10 lists
Firecrawl Blog	Best Claude Code skills roundups
Analytics Vidhya	"Top 5 GitHub Repos for Free Claude Code Skills" etc.

7.4 Official Documentation and Learning

Resource	URL
Claude Code Skills Docs	https://code.claude.com/docs/en/skills
Claude API Skills Guide	https://platform.claude.com/docs/en/build-with-claude/skills-guide
Agent Skills Standard	https://agentskills.io
Codex Skills Docs	https://developers.openai.com/codex/skills
Gemini CLI Skills Docs	https://geminicli.com/docs/cli/skills/
VS Code Agent Skills	https://code.visualstudio.com/docs/copilot/customization/agent-skills
Anthropic Skills Academy	https://anthropic.skilljar.com/introduction-to-agent-skills

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8. API and Programmatic Access

8.1 Anthropic Skills API (/v1/skills)

• Docs: https://platform.claude.com/docs/en/api/beta/skills
• Endpoints:
  • POST /v1/skills -- Create a skill
  • GET /v1/skills -- List skills
  • GET /v1/skills/{skill_id} -- Get skill details
  • DELETE /v1/skills/{skill_id} -- Delete a skill
  • POST /v1/skills/{skill_id}/versions -- Create version
  • GET /v1/skills/{skill_id}/versions -- List versions
  • GET /v1/skills/{skill_id}/versions/{version} -- Get version
  • DELETE /v1/skills/{skill_id}/versions/{version} -- Delete version
• Usage in Messages API: Skills specified via container.skills parameter; up to 8 skills per request
• Beta Headers Required: code-execution-2025-08-25, skills-2025-10-02
• Scope: Organization-wide custom skills management
• Assessment: Full CRUD API for managing custom skills programmatically. Enterprise-grade.

8.2 skills.sh CLI (npx skills)

• Search: npx skills find <query>
• Install: npx skills add <owner/repo>
• NPM Package: skills on npmjs.com
• API: No documented REST API; CLI is the programmatic interface
• Assessment: Best CLI-based programmatic access for the open ecosystem.

8.3 SkillsMP MCP Server

• URL: https://mcpmarket.com/server/skillsmp
• Type: MCP server for querying SkillsMP programmatically
• Assessment: Can integrate SkillsMP search into agent workflows via MCP.

8.4 claude-skills-mcp

• URL: https://github.com/K-Dense-AI/claude-skills-mcp
• Type: MCP server for searching and retrieving Claude Agent Skills using vector search
• Assessment: Semantic search over skills via MCP protocol.

8.5 GitHub API

• All skill repositories on GitHub can be queried via the GitHub API
• Search for SKILL.md files: gh api search/code -q '.items[].repository.full_name' --field q='filename:SKILL.md'
• Search by topic: gh api search/repositories --field q='topic:claude-skills'

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9. Open Standard: Agent Skills Specification

9.1 agentskills.io

• URL: https://agentskills.io
• Spec: https://agentskills.io/specification
• GitHub: https://github.com/agentskills/agentskills
• Type: Open standard specification for SKILL.md format

9.2 SKILL.md Format Summary

skills/<name>/
  SKILL.md          # Required: YAML frontmatter + markdown instructions
  scripts/          # Optional: executable code (Python, Bash, JS)
  references/       # Optional: additional docs (REFERENCE.md, etc.)
  assets/           # Optional: images, templates, data

Frontmatter fields:

• name (required, max 64 chars)
• description (required)
• license (optional)
• compatibility (optional, 1-500 chars)
• metadata (optional, string key-value map)
• allowed-tools (optional)

9.3 Platform Adoption

The SKILL.md format is now supported by:

• Claude Code (Anthropic)
• Codex CLI (OpenAI)
• Gemini CLI / Antigravity (Google)
• GitHub Copilot (Microsoft/GitHub)
• OpenCode (open source)
• Cursor (partial, via plugins)
• Windsurf (via adaptation)

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10. Summary Matrix

Source	Type	Scale	Quality	API	Cross-Platform
skills.sh	Package manager + directory	90k+ installs	Community + leaderboard	CLI only	Yes (20+ agents)
anthropics/skills	Official repo	Curated set	Official/high	Plugin system	Claude Code
openai/skills	Official repo	~35 skills	Official/high	Codex CLI	Codex
google-gemini/gemini-skills	Official repo	Growing	Official	Gemini CLI	Gemini
github/awesome-copilot	Official collection	Growing	Official	GitHub API	Copilot
SkillsMP	Web aggregator	500k+ skills	Auto-filtered	MCP server	Yes
claude-plugins.dev	Auto-indexed registry	51k+ skills	Auto-indexed	CLI	Yes
SkillHub	Web marketplace	7k+ skills	AI-evaluated	Web	Yes
MCP Market (skills)	Web directory	Very large	Mixed	Web	Yes
ClaudeMarketplaces	Curated directory	Hand-picked	High (500+ installs)	Web	Claude Code
SkillsDirectory	Security-focused	Curated	Security-verified	Web	Claude
TonsOfSkills	Skills hub	2,787 skills	Production-ready	Web	Claude Code
LobeHub Skills	Marketplace	Large	Mixed	Web	Yes
awesome-claude-code	GitHub awesome list	32.7k stars	Curated	GitHub API	Claude Code
awesome-agent-skills	GitHub awesome list	12.9k stars, 1000+ skills	Curated by vendor	GitHub API	Yes
cursor.directory	Web directory	48k+ devs, 250k visits/mo	Community	Web	Cursor
dotcursorrules.com	Web directory	Large	Community	Web	Cursor
Cursor Marketplace	Official marketplace	Growing (launched Feb 2026)	Official partners	TBD	Cursor
instructa/ai-prompts	GitHub repo	Multi-platform	Curated	GitHub API	Yes
Anthropic API	REST API	Organization skills	Enterprise	Full REST	Via API
r/ClaudeAI	Reddit	612k members	Community	Reddit API	Discussion
r/ClaudeCode	Reddit	96k members	Community	Reddit API	Discussion
Claude Discord	Discord	75k+ members	Community	Discord API	Discussion

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Key Takeaways

1. The ecosystem has converged on SKILL.md as the universal format, adopted by Anthropic, OpenAI, Google, GitHub, and the open-source community via the agentskills.io specification.

2. skills.sh is the npm of agent skills -- the primary package manager and directory. Start here for CLI-based discovery and installation.

3. Quality varies enormously -- from security-vetted (SkillsDirectory.com) to auto-indexed GitHub scrapes (SkillsMP, claude-plugins.dev). Always review code before installing.

4. Cross-platform portability is real -- the same SKILL.md works across Claude Code, Codex, Gemini CLI, Copilot, and OpenCode. Skills written for one tool generally work in others.

5. GitHub topics are the best discovery mechanism for finding individual skill repos: claude-skills (1,554 repos), agent-skills, codex-skills, etc.

6. Cursor rules are a rich adaptation source -- cursor.directory alone has 48k+ developers sharing framework-specific rules that can be converted to SKILL.md format.

7. The Anthropic /v1/skills API provides full programmatic CRUD for managing skills in enterprise contexts.

8. Official vendor repos (anthropics/skills, openai/skills, google-gemini/gemini-skills, github/awesome-copilot) are the highest-quality starting points but have limited breadth.