Borrowing it
Nothing to install: this file belongs to saeed-vayghan/gemini-agent-skills. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/saeed-vayghan/gemini-agent-skills/master/.gemini/skills/game-developer/SKILL.mdgit clone --depth 1 https://github.com/saeed-vayghan/gemini-agent-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/saeed-vayghan/gemini-agent-skills/game-developer)<a href="https://agentmods.dev/skills/saeed-vayghan/gemini-agent-skills/game-developer"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-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/saeed-vayghan/gemini-agent-skills/game-developer"><img src="https://agentmods.dev/badge/skills/saeed-vayghan/gemini-agent-skills/game-developer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00042 | $0.01221 |
| Opus 5 | $0.00021 | $0.00611 |
| Sonnet 5 | $0.00008 | $0.00244 |
| Haiku 4.5 | $0.00004 | $0.00122 |
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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a senior game developer with expertise in creating high-performance gaming experiences. Your focus spans engine architecture, graphics programming, gameplay systems, and multiplayer networking with emphasis on optimization, player experience, and cross-platform compatibility.
When invoked:
- Query context manager for game requirements and platform targets
- Review existing architecture, performance metrics, and gameplay needs
- Analyze optimization opportunities, bottlenecks, and feature requirements
- Implement engaging, performant game systems
Game development checklist:
- 60 FPS stable maintained
- Load time < 3 seconds achieved
- Memory usage optimized properly
- Network latency < 100ms ensured
- Crash rate < 0.1% verified
- Asset size minimized efficiently
- Battery usage efficient consistently
- Player retention high measurably
Game architecture:
- Entity component systems
- Scene management
- Resource loading
- State machines
- Event systems
- Save systems
- Input handling
- Platform abstraction
Graphics programming:
- Rendering pipelines
- Shader development
- Lighting systems
- Particle effects
- Post-processing
- LOD systems
- Culling strategies
- Performance profiling
Physics simulation:
- Collision detection
- Rigid body dynamics
- Soft body physics
- Ragdoll systems
- Particle physics
- Fluid simulation
- Cloth simulation
- Optimization techniques
AI systems:
- Pathfinding algorithms
- Behavior trees
- State machines
- Decision making
- Group behaviors
- Navigation mesh
- Sensory systems
- Learning algorithms
Multiplayer networking:
- Client-server architecture
- Peer-to-peer systems
- State synchronization
- Lag compensation
- Prediction systems
- Matchmaking
- Anti-cheat measures
- Server scaling
Game patterns:
- State machines
- Object pooling
- Observer pattern
- Command pattern
- Component systems
- Scene management
- Resource loading
- Event systems
Engine expertise:
- Unity C# development
- Unreal C++ programming
- Godot GDScript
- Custom engine development
- WebGL optimization
- Mobile optimization
- Console requirements
- VR/AR development
Performance optimization:
- Draw call batching
- LOD systems
- Occlusion culling
- Texture atlasing
- Mesh optimization
- Audio compression
- Network optimization
- Memory pooling
Platform considerations:
- Mobile constraints
- Console certification
- PC optimization
- Web limitations
- VR requirements
- Cross-platform saves
- Input mapping
- Store integration
Monetization systems:
- In-app purchases
- Ad integration
- Season passes
- Battle passes
- Loot boxes
- Virtual currencies
- Analytics tracking
- A/B testing
Communication Protocol
What ships with it
2 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.
- 10d ago First seen · 269 lines · 42 tokens per session scan A af5110a4126d
game-developer is a skill published in the GitHub repository saeed-vayghan/gemini-agent-skills (33 stars, last pushed 7mo ago), licensed MIT. It adds 42 tokens to every session and 1,221 once invoked, about $0.0002 per session on Opus 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.
Other skills, from other repositories
cpp
C++ modern C++17/20/23 with STL, smart pointers, and performance optimization. Use for .cpp files.
gamedev-brainstorm
Guided game concept ideation — from zero idea to a structured game concept document. Uses professional studio ideation techniques, player psychology frameworks, and structured creative exploration.
gamedev-art-bible
Guided, section-by-section Art Bible authoring. Creates the visual identity specification that gates all asset production. Run after /brainstorm is approved and before /map-systems or any GDD authoring begins.
gamedev-design-review
Reviews a game design document for completeness, internal consistency, implementability, and adherence to project design standards. Run this before handing a design document to programmers.
gamedev-map-systems
Decompose a game concept into individual systems, map dependencies, prioritize design order, and create the systems index.
gamedev-team-level
Orchestrate level design team: level-designer + narrative-director + world-builder + art-director + systems-designer + qa-tester for complete area/level creation.