mutation-testing

Marketplace Installation (Recommended)

```bash

# Add the marketplace

/plugin marketplace add https://github.com/secondsky/claude-skills

# Install individual skills as needed

/plugin install cloudflare-worker-base@claude-skills

/plugin install tailwind-v4-shadcn@claude-skills

/plugin install ai-sdk-core@claude-skills

```

See [MARKETPLACE.md](MARKETPLACE.md) for complete catalog of all 176 skills.

Bulk Installation (Contributors)

```bash

# Clone the repository

git clone https://github.com/secondsky/claude-skills.git

cd claude-skills

# Install all 176 skills at once

./scripts/install-all.sh

# Or install individual skills

./scripts/install-skill.sh cloudflare-worker-base

```

---

This repository contains 176 production-tested skills for Claude Code, each focused on a specific technology or capability.

Individual Skills: Each skill is a standalone unit with:

• SKILL.md - Core knowledge and guidance
• Templates - Working code examples
• References - Extended documentation
• Scripts - Helper utilities

Installation Options:

1. Individual - Install only the skills you need via marketplace
2. Bulk - Install all 176 skills using ./scripts/install-all.sh

---

Each skill is individually installable. Install only the skills you need.

Full Catalog: See [MARKETPLACE.md](MARKETPLACE.md) for detailed listings.

Categories

| Category | Skills | Examples |

|----------|--------|----------|

| tooling | 32 | project-workflow, skill-review, turborepo, plan-interview |

| frontend | 25 | nuxt-v4, tailwind-v4-shadcn, tanstack-query, nuxt-studio, maz-ui |

| cloudflare | 24 | cloudflare-d1, cloudflare-workers-ai, cloudflare-agents |

| ai | 20 | openai-agents, claude-api, ai-sdk-core |

| api | 16 | api-design-principles, graphql-implementation |

| web | 10 | hono-routing, firecrawl-scraper, web-performance |

| mobile | 7 | swift-best-practices, react-native-app, react-native-skills |

| database | 6 | drizzle-orm-d1, neon-vercel-postgres |

| security | 6 | csrf-protection, access-control-rbac |

| auth | 5 | better-auth, clerk-auth |

| testing | 4 | vitest-testing, playwright-testing |

| design | 4 | design-review, design-system-creation |

| woocommerce | 4 | woocommerce-backend-dev |

| cms | 4 | hugo, sveltia-cms, wordpress-plugin-core |

| architecture | 3 | microservices-patterns, architecture-patterns |

| data | 3 | sql-query-optimization, recommendation-engine |

| seo | 2 | seo-optimizer, seo-keyword-cluster-builder |

| documentation | 1 | technical-specification |

---

Auto-Discovery

Claude Code automatically checks ~/.claude/skills/ for relevant skills before planning tasks:

```

User: "Set up a Cloudflare Worker with D1 database"

↓

Claude: [Checks skills automatically]

↓

Claude: "Found cloudflare-worker-base and cloudflare-d1 skills.

These prevent 12 documented errors. Use them?"

↓

User: "Yes"

↓

Result: Production-ready setup, zero errors, ~65% token savings

```

Note: Due to token limits, not all skills may be visible at once. See [⚠️ Important: Token Limits](#-important-token-limits) below.

Skill Structure

Each skill includes:

```

skills/[skill-name]/

├── SKILL.md # Complete documentation

├── .claude-plugin/

│ └── plugin.json # Plugin metadata

├── templates/ # Ready-to-copy templates

├── scripts/ # Automation scripts

└── references/ # Extended documentation

```

---

December 2025 - January 2026

Frontend Expansion:

• nuxt-studio (v1.0.0) - Visual CMS for Nuxt Content with live preview, OAuth auth, and R2 storage integration
• maz-ui (v1.0.0) - 50+ Vue/Nuxt components with theming, i18n, form generation, and 14 composables

Developer Workflow:

• plan-interview (v2.0.0) - Adaptive interview-driven spec generation with autonomous quality review
• turborepo (v2.8.0) - Updated to official Vercel skill with enhanced monorepo build optimization

Mobile Development:

• react-native-skills (v1.0.0) - React Native & Expo best practices with performance optimization patterns

Enhanced Authentication:

• better-auth (v2.2.0) - Expanded to 18 framework integrations with 30+ authentication plugins

---

Skill Visibility Constraint

Claude Code has a 15,000 character limit for the total size of skill descriptions in the system prompt. This limit also applies to commands and agents.

What this means:

• Not all 176 skills may be visible in Claude's context at once
• Skills are loaded based on relevance and available token budget
• You can verify how many skills Claude currently sees by asking: "How many skills do you see in your system prompt?"

Checking Visible Skills

To verify which skills are currently loaded:

```bash

# Ask Claude Code directly

"Check what skills/plugins you see in your system prompt"

```

Claude will report something like: "85 of 176 skills visible due to token limits"

Workaround: Increase Token Budget

You can double the headroom for skill descriptions by setting an environment variable:

```bash

# Increase limit to 30,000 characters

export SLASH_COMMAND_TOOL_CHAR_BUDGET=30000

# Then launch Claude Code

claude

```

This gives you approximately 2x more skill visibility in the system prompt.

Note: This is a temporary workaround. The Claude Code team is working on better solutions for skill discovery and loading.

---

| Metric | Manual Setup | With Skills | Savings |

|--------|--------------|-------------|---------|

| Average Tokens | 12,000-15,000 | 4,000-5,000 | ~65% |

| Typical Errors | 2-4 per service | 0 (prevented) | 100% |

| Setup Time | 2-4 hours | 15-45 minutes | ~80% |

Across all 176 skills: 400+ documented errors prevented.

---

Prerequisites for Contributors

Install the official plugin development toolkit:

```bash

/plugin install plugin-dev@claude-code-marketplace

```

This provides:

• /plugin-dev:create-plugin command (8-phase guided workflow)
• 7 comprehensive skills (hooks, MCP, structure, agents, commands, skills)
• 3 specialized agents (agent-creator, plugin-validator, skill-reviewer)

Quick Steps

1. Create skill directory in plugins/
2. Add SKILL.md with YAML frontmatter
3. Run ./scripts/sync-plugins.sh
4. Submit pull request

See [CONTRIBUTING.md](docs/guides/CONTRIBUTING.md) and [PLUGIN_DEV_BEST_PRACTICES.md](docs/guides/PLUGIN_DEV_BEST_PRACTICES.md) for detailed guidelines.

---

| Document | Purpose |

|----------|---------|

| [START_HERE.md](docs/getting-started/START_HERE.md) | Start here! Quick navigation guide |

| [PLUGIN_DEV_BEST_PRACTICES.md](docs/guides/PLUGIN_DEV_BEST_PRACTICES.md) | Repository-specific best practices (marketplace, budget, quality) |

| [MARKETPLACE.md](MARKETPLACE.md) | Full skill catalog and installation guide |

| [MARKETPLACE_MANAGEMENT.md](docs/guides/MARKETPLACE_MANAGEMENT.md) | Technical infrastructure (plugin.json, scripts, validation) |

| [CLAUDE.md](CLAUDE.md) | Project context and development standards |

| [CONTRIBUTING.md](docs/guides/CONTRIBUTING.md) | Contribution guidelines |

---

• Repository: https://github.com/secondsky/claude-skills
• Issues: https://github.com/secondsky/claude-skills/issues
• Claude Code: https://claude.com/claude-code

---

Built with ❤️ by Claude Skills Maintainers