claude-skills is a collection of specialized skills that extends Claude Code for full-stack development. Developers use it for programming languages, frameworks, infrastructure, APIs, testing, DevOps, security, data and machine learning, platform tasks, and project workflows.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Jeffallan/claude-skills --skill game-developergit clone --depth 1 https://github.com/Jeffallan/claude-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jeffallan/claude-skills/game-developer)<a href="https://agentmods.dev/skills/jeffallan/claude-skills/game-developer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/game-developer/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/jeffallan/claude-skills/game-developer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/game-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00099 | $0.01286 |
| Opus 5.5 | $0.00040 | $0.00514 |
| Sonnet 5.5 | $0.00020 | $0.00257 |
| Haiku 4.5 | $0.00010 | $0.00129 |
Grade A, and why
game-developer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 23d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- game-developer — 94% identical, 5 lines differ
How it starts
The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Game Developer
Core Workflow
- Analyze requirements — Identify genre, platforms, performance targets, multiplayer needs
- Design architecture — Plan ECS/component systems, optimize for target platforms
- Implement — Build core mechanics, graphics, physics, AI, networking
- Optimize — Profile and optimize for 60+ FPS, minimize memory/battery usage
- ✅ Validation checkpoint: Run Unity Profiler or Unreal Insights; verify frame time ≤16 ms (60 FPS) before proceeding. Identify and resolve CPU/GPU bottlenecks iteratively.
- Test — Cross-platform testing, performance validation, multiplayer stress tests
- ✅ Validation checkpoint: Confirm stable frame rate under stress load; run multiplayer latency/desync tests before shipping.
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Unity Development | references/unity-patterns.md |
Unity C#, MonoBehaviour, Scriptable Objects |
| Unreal Development | references/unreal-cpp.md |
Unreal C++, Blueprints, Actor components |
| ECS & Patterns | references/ecs-patterns.md |
Entity Component System, game patterns |
| Performance | references/performance-optimization.md |
FPS optimization, profiling, memory |
| Networking | references/multiplayer-networking.md |
Multiplayer, client-server, lag compensation |
Constraints
MUST DO
- Target 60+ FPS on all platforms
- Use object pooling for frequent instantiation
- Implement LOD systems for optimization
- Profile performance regularly (CPU, GPU, memory)
- Use async loading for resources
- Implement proper state machines for game logic
- Cache component references (avoid GetComponent in Update)
- Use delta time for frame-independent movement
MUST NOT DO
- Instantiate/Destroy in tight loops or Update()
- Skip profiling and performance testing
- Use string comparisons for tags (use CompareTag)
- Allocate memory in Update/FixedUpdate loops
- Ignore platform-specific constraints (mobile, console)
- Use Find methods in Update loops
- Hardcode game values (use ScriptableObjects/data files)
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 23d ago Changed · +3 lines 4578facce19a
- 1mo ago First seen · 164 lines · 99 tokens per session scan A 89297efd2a6b
game-developer is a skill published in the GitHub repository Jeffallan/claude-skills (12,074 stars, last pushed yesterday), licensed MIT. It adds 99 tokens to every session and 1,286 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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