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.
Install all skills:
npx add-skill giulioco/skillsInstall specific skills only:
npx add-skill giulioco/skills --skill social-growth-engineerMaster 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)
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)
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)
Master sales coaching skill synthesizing six foundational books into a single working system.
What it does: Distills SPIN Selling (Rackham), Fanatical Prospecting (Blount), Gap Selling (Keenan), The Challenger Sale (Dixon & Adamson), Never Split the Difference (Voss), and How to Win Friends & Influence People (Carnegie) into a stage-aware sales coach. Diagnoses where you are in the journey first, then prescribes the right move from the right book — most sales failures come from using a small-sale tactic in a big-sale context, pitching before diagnosing, or arguing instead of asking.
Use when:
- Drafting cold emails, DMs, follow-ups, or any outbound outreach
- Preparing for or reviewing discovery calls, demos, or QBRs
- Handling pricing pushback, objections, or stalled deals
- Negotiating contracts, terms, or salary
- Planning ICP, messaging architecture, channel sequencing, or pipeline math
- Coaching reps or being coached
- Reviewing your own sales messaging
Knowledge includes:
- The diagnose-first sales loop (5-question pre-flight check before any tactic)
- SPIN question arsenal (Situation / Problem / Implication / Need-payoff) with example banks
- Gap Selling Problem Identification Chart (PIC) for pre-call planning
- Challenger 6-step Commercial Teaching choreography (Warmer → Reframe → Rational Drowning → Emotional Impact → New Way → Solution)
- Voss tactical empathy toolkit (mirroring, labeling, accusation audit, calibrated questions, Ackerman bargaining model, "no"-oriented framing)
- Blount prospecting playbook (30-Day Rule, Golden Hours, 5-step phone framework, voicemail framework, RBO turnarounds, combo prospecting)
- Carnegie influence principles cross-walked to modern sales (where Carnegie holds, where modern research overrides)
- 12+ verbatim email templates (cold outbound, follow-up, re-engagement, pricing, internal)
- 20+ verbatim phone scripts and objection turnarounds
- Voss one-page negotiation prep template
- Full extracts of all six books (~4,200 lines) for deep reference
Size: ~280 KB (SKILL.md + 6 frameworks + 3 asset packs + 6 book extracts)
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)
npx add-skill giulioco/skillsThis installs all skills in the collection to your ~/.claude/skills/ directory.
List available skills first:
npx add-skill giulioco/skills --listThen install only what you need:
npx add-skill giulioco/skills --skill social-growth-engineernpx add-skill -g giulioco/skillsnpx add-skill giulioco/skills -yOnce installed, skills are available in Claude Code:
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
Invoke a skill manually with slash commands:
/social-growth-engineer
Then ask your questions.
In Claude Code, type / to see all available skills.
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
└── ultimate-sales/ # Rackham + Blount + Keenan + Dixon + Voss + Carnegie synthesis
├── SKILL.md # Main skill file (stage-aware coach)
├── frameworks/ # Synthesis layer
│ ├── diagnose-first.md
│ ├── question-arsenal.md
│ ├── reframe-and-teach.md
│ ├── tactical-empathy.md
│ ├── prospecting-playbook.md
│ └── influence-principles.md
├── assets/ # Templates and scripts
│ ├── email-templates.md
│ ├── call-scripts.md
│ └── negotiation-prep.md
└── references/ # Full book extracts
├── spin-selling.md
├── fanatical-prospecting.md
├── gap-selling.md
├── challenger-sale.md
├── never-split-the-difference.md
└── how-to-win-friends.md
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!
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.
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.
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Create a new directory in
skills/:mkdir -p skills/my-new-skill
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Create
SKILL.mdwith proper frontmatter:--- name: my-new-skill description: Clear description of what this skill does --- # Skill Content Instructions for Claude...
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Test locally with
npx add-skill . -
Submit a PR!
See the Claude Code Skills Documentation for detailed skill authoring guidelines.
This collection is licensed under the Apache License 2.0. See LICENSE for details.
Individual skills may have additional attributions in their reference materials.
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.
- Issues: GitHub Issues
- Discussions: GitHub Discussions
- Documentation: Claude Code Skills Docs
Install now: npx add-skill giulioco/skills
Built with ❤️ for the Claude Code community