2d-games
Free2D game development principles. Sprites, tilemaps, physics, camera.
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MANDATORY skill for all agents. Establishes how to discover, load, and use skills from SKILL-INDEX.md. Also detects when user is teaching new rules.
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See how to installReview the instructions the agent will receive before you install.
This skill teaches agents HOW to use the skills system. It's meta.
This is NOT optional. This is NOT negotiable. You cannot rationalize your way out of this. </MANDATORY>
User Request → Scan SKILL-INDEX.md → Match Skills → Load Relevant → Announce → Apply
skills/SKILL-INDEX.md (lightweight, categorized)skills/{skill-name}/SKILL.md| Your Thought | The Reality |
|---|---|
| "This is just a simple question" | Simple questions have best practices too |
| "I already know this" | Skills evolve. Read the current version. |
| "Let me explore the code first" | Skills tell you HOW to explore |
| "This doesn't need a formal skill" | If a skill exists, use it |
| "The skill is overkill" | Discipline prevents mistakes |
| "I'll just do this one thing first" | Check skills BEFORE doing anything |
| "I know what the user means" | Skills provide the HOW, not just WHAT |
When multiple skills could apply:
Example:
systematic-debugging first, then domain skillsstripe-integration + framework skill| Signal | Example | Action |
|---|---|---|
| Explicit rule | "siempre usa X", "regla:", "nunca hagas Y" | Confirm & create |
| Correction | "no, hacelo asi..." + shows pattern | Ask if should persist |
| Preference | "prefiero X sobre Y porque..." | Note for skill |
| Repeated pattern | Same correction 3+ times | Propose skill creation |
| Best practice | "buena practica:", "el estandar es..." | Confirm & create |
| Style guide | "en este proyecto usamos..." | Add to project skill |
| Framework rule | "en React siempre...", "en Python nunca..." | Add to language skill |
Recognize the teaching moment
Confirm intent
Clarify scope
Preview the rule before creating
Create in skills/{skill-name}/rules/_custom-{name}.md
Rebuild index: bun run skills/_scripts/generate-index.ts
---
title: Rule Title
impact: HIGH | MEDIUM | LOW
tags: tag1, tag2
source: user-taught
date: YYYY-MM-DD
---
## Rule Title
[Why this matters - one sentence]
**Do:**
```code
// correct pattern
Don't:
// incorrect pattern
[Optional: Reference or context]
### Scope Resolution
| User Says | Skill Location |
|-----------|----------------|
| "en Python siempre..." | `skills/python/rules/_custom-{name}.md` |
| "en React..." | `skills/react/rules/_custom-{name}.md` |
| "en este proyecto..." | `skills/general/rules/_custom-{name}.md` |
| "siempre que uses X..." | `skills/{x}/rules/_custom-{name}.md` |
| New domain entirely | Create new `skills/{name}/` folder |
---
## Part 3: Maintenance Commands
```bash
# After adding/modifying skills
bun run skills/_scripts/generate-index.ts
# To sync external sources (anthropics, vercel-labs)
bun run skills/_scripts/sync-external.ts
# To rebuild SKILL.md from rules/ folder
bun run skills/_scripts/build.ts
| Category | Examples | When to Use |
|---|---|---|
| AI Agents & LLM | langgraph, crewai, rag-engineer | Building AI features |
| Development | react-patterns, nextjs, python | Coding specific stacks |
| Testing & QA | playwright, tdd-workflow | Testing strategies |
| Cybersecurity | pentest-*, ethical-hacking | Security audits |
| Integrations | stripe, firebase, supabase | Third-party APIs |
| Marketing | seo-, cro-, copywriting | Growth features |
| Infrastructure | docker, aws-, git- | DevOps tasks |
| Workflow | writing-plans, executing-plans | Process management |
Rigid (TDD, debugging, verification): Follow EXACTLY. Don't adapt away discipline.
Flexible (patterns, integrations): Adapt principles to context.
The skill itself tells you which type it is.
Instructions say WHAT to do. Skills say HOW to do it well.
"Add Stripe payments" is WHAT.
stripe-integrationskill tells you HOW.Never skip the HOW.
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2D game development principles. Sprites, tilemaps, physics, camera.
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3D game development principles. Rendering, shaders, physics, cameras.
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Expert in building 3D experiences for the web - Three.js, React Three Fiber, Spline, WebGL, and interactive 3D scenes. Covers product configurators, 3D portfolios, immersive websites, and bringing depth to web experiences. Use when: 3D website, three.js, WebGL, react three fiber, 3D experience.
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Structured guide for setting up A/B tests with mandatory gates for hypothesis, metrics, and execution readiness.
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This skill should be used when the user asks to "attack Active Directory", "exploit AD", "Kerberoasting", "DCSync", "pass-the-hash", "BloodHound enumeration", "Golden Ticket", "Silver Ticket", "AS-REP roasting", "NTLM relay", or needs guidance on Windows domain penetration testing.
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Use when you need to address review or issue comments on an open GitHub Pull Request using the gh CLI.
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