giulioco__skills/README.md

Giulio's Claude Code Skills Collection

A curated collection of Claude Code skills for developers, marketers, and founders. Install with a single command to extend Claude's capabilities with specialized knowledge and workflows.

Quick Start

Install all skills:

npx add-skill giulioco/skills

Install specific skills only:

npx add-skill giulioco/skills --skill social-growth-engineer

Available Skills

🎨 nano-banana-prompt

Master prompt engineering for Nano Banana Pro (Gemini) image generation.

What it does: Comprehensive guide for crafting highly effective prompts for Nano Banana Pro. Provides proven patterns, technical specifications, JSON structuring, and identity preservation techniques based on analyzing 60+ successful prompts.

Use when:

• Generating photorealistic portraits
• Creating product photography and e-commerce mockups
• Building creative experiments (3D renders, dioramas, surreal effects)
• Crafting era-specific aesthetics (Y2K, 2000s, 1990s)
• Editing and transforming images
• Preserving facial identity across transformations

Knowledge includes:

• Identity preservation techniques
• Technical specifications (cameras, lenses, lighting, film stocks)
• 5 comprehensive reference guides (photorealism, creative experiments, product/commercial, editing, JSON templates)
• Era-specific templates (2000s mirror selfie, Y2K scrapbook, 1990s flash photography)
• Quick reference templates for common use cases
• Advanced techniques (multi-element scenes, negative prompts, text integration)

Size: 38 KB (SKILL.md + 5 reference files)

View Details →

---

🚀 social-growth-engineer

Master viral app growth through organic social media marketing.

What it does: Teaches Claude everything about growing consumer apps virally through TikTok, Instagram Reels, and YouTube Shorts. Based on analyzing 100+ successful app launches generating billions of views and millions in monthly revenue.

Use when:

• Launching or growing a consumer app
• Creating viral content strategies
• Building UGC ambassador networks
• Optimizing monetization and conversion
• Analyzing competitor growth tactics

Knowledge includes:

• 100+ real case studies with verified metrics ($10K to $5.5M ARR)
• 50+ proven hook formulas
• 30+ video format templates
• Platform-specific tactics (TikTok, Instagram, YouTube)
• Niche playbooks (study apps, dating, fitness, Bible, AI companions, travel)
• Complete growth frameworks and scaling strategies

Size: 91 KB (SKILL.md + 3 reference files)

View Details →

---

📊 growth-hacker

Diagnose the real growth bottleneck and prescribe the next move, using the unified frameworks from three foundational growth books.

What it does: Synthesizes Ryan Holiday's Growth Hacker Marketing, Sean Ellis & Morgan Brown's Hacking Growth, and Weinberg & Mares' Traction into a single diagnostic + prescriptive system. Refuses to recommend tactics before diagnosing the stage — "founders pick the channel they're comfortable with, not the one their stage needs" is the #1 growth mistake.

Use when:

• Stuck at a revenue plateau and not sure why
• Choosing between marketing channels
• Diagnosing a leaky funnel (low conversion, low activation, low retention)
• Searching for product-market fit
• Designing a viral loop or referral program
• Picking a North Star metric or growth equation
• Running a weekly growth-experiment cycle (ICE scoring)

Knowledge includes:

• 4-level diagnostic model (PMF → Aha → Channel → Optimization)
• Sean Ellis 40% test (with the 5 companion questions verbatim)
• Aha-moment thresholds from Facebook, Twitter, Slack, Dropbox, Uber, Instagram, eBay
• The Growth Equation (Inman, eBay, Amazon examples)
• Activation playbook (HubSpot Sidekick's 11→12 experiments, Etsy, Tinder)
• Retention playbook (smile graph, cohort analysis, three phases)
• Engineered virality (Holiday's principles + viral math K = i × c)
• The full 19-channel Bullseye taxonomy with $1k test design per channel
• Weekly growth cycle + ICE scoring (verbatim Ellis methodology)
• Mindset quotes from Holiday, Andreessen, Thiel, Ellis, Andrew Chen

Size: ~80 KB (SKILL.md + 9 reference files + 19 channel deep-dives)

View Details →

---

📈 postbridge-social-growth

Organic growth coach using the Post Bridge methodology.

What it does: Acts as a personalized organic growth coach for apps, products, and businesses seeking traffic from TikTok and Instagram short-form video. Based on the Post Bridge system that generated 500M+ views, 132K+ downloads, and $33K+ revenue with zero paid ads.

Use when:

• Starting organic social media growth from scratch
• Warming up new TikTok/Instagram accounts
• Finding winning content formats (content-market fit)
• Converting views into app downloads or customers
• Writing conversion-optimized social media bios
• Riding trends for momentum
• Scaling to multiple accounts and platforms

Knowledge includes:

• Complete 30-day growth roadmap
• 7-day account warmup protocol
• Content-market fit testing framework
• Conversion funnel optimization (views → downloads)
• Trend identification and adaptation playbook
• Three-phase scaling framework
• Bio writing formulas and CTA strategies

Size: 12 KB (SKILL.md + 1 reference file)

View Details →

---

Installation

Install All Skills

npx add-skill giulioco/skills

This installs all skills in the collection to your ~/.claude/skills/ directory.

Install Specific Skills

List available skills first:

npx add-skill giulioco/skills --list

Then install only what you need:

npx add-skill giulioco/skills --skill social-growth-engineer

Install Globally

npx add-skill -g giulioco/skills

Non-Interactive Mode

npx add-skill giulioco/skills -y

Usage

Once installed, skills are available in Claude Code:

Automatic Invocation

Claude automatically activates skills when you ask relevant questions:

How do I grow my app virally?
What hooks work for dating apps?
Help me launch in 30 days

Manual Invocation

Invoke a skill manually with slash commands:

/social-growth-engineer

Then ask your questions.

List Your Skills

In Claude Code, type / to see all available skills.

Repository Structure

skills/
├── README.md                       # This file
├── LICENSE                         # Apache 2.0
├── CONTRIBUTING.md                 # Contribution guidelines
├── .gitignore
└── skills/
    ├── nano-banana-prompt/         # Nano Banana Pro prompt engineering
    │   ├── SKILL.md                # Main skill file
    │   └── references/             # Supporting documentation
    │       ├── photorealism-portraits.md
    │       ├── creative-experiments.md
    │       ├── product-commercial.md
    │       ├── editing-transformation.md
    │       └── json-structure-guide.md
    ├── social-growth-engineer/     # Viral app growth
    │   ├── SKILL.md                # Main skill file
    │   └── references/             # Supporting documentation
    │       ├── complete-playbook.md
    │       ├── hooks-and-formats.md
    │       └── case-studies.md
    ├── postbridge-social-growth/   # Post Bridge organic growth coach
    │   ├── SKILL.md                # Main skill file
    │   └── references/             # Supporting documentation
    │       └── methodology.md
    └── growth-hacker/              # Holiday + Ellis + Weinberg synthesis
        ├── SKILL.md                # Main skill file (diagnostic router)
        └── references/             # Frameworks + 19 channel deep-dives
            ├── pmf.md
            ├── aha-moment.md
            ├── growth-equation.md
            ├── activation.md
            ├── retention.md
            ├── virality.md
            ├── bullseye.md
            ├── growth-process.md
            ├── mindset.md
            └── channels/           # 19 channel files + index

Skills Roadmap

Coming Soon:

• 📊 data-analyst: Advanced data analysis and visualization workflows
• 🎨 design-system: Building and maintaining design systems
• 🔧 devops-expert: Infrastructure, CI/CD, and deployment strategies
• 📝 technical-writer: Creating clear technical documentation

Want to see a specific skill? Open an issue with your suggestion!

Contributing

We welcome contributions! Whether you want to:

• Add new case studies to existing skills
• Create entirely new skills
• Fix errors or improve documentation
• Share your successful strategies

See CONTRIBUTING.md for guidelines.

Development

Testing Skills Locally

Clone and test before installation:

git clone https://github.com/giulioco/skills.git
cd skills
npx add-skill .

Test the skill in Claude Code by asking relevant questions.

Creating New Skills

1. Create a new directory in skills/:

   mkdir -p skills/my-new-skill
   

2. Create SKILL.md with proper frontmatter:

   ---
   name: my-new-skill
   description: Clear description of what this skill does
   ---
   
   # Skill Content
   
   Instructions for Claude...
   

3. Test locally with npx add-skill .

4. Submit a PR!

See the Claude Code Skills Documentation for detailed skill authoring guidelines.

License

This collection is licensed under the Apache License 2.0. See LICENSE for details.

Individual skills may have additional attributions in their reference materials.

Acknowledgments

social-growth-engineer is built from analyzing the Social Growth Engineer newsletter archive. All case studies and metrics are from real apps and verified sources.

Support

• Issues: GitHub Issues
• Discussions: GitHub Discussions
• Documentation: Claude Code Skills Docs

Links

• Claude Code Documentation
• Anthropic Skills Repository
• add-skill Tool

---

Install now: npx add-skill giulioco/skills

Built with ❤️ for the Claude Code community