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 curiositech/some_claude_skills --skill metal-shader-expertgit clone --depth 1 https://github.com/curiositech/some_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/curiositech/some_claude_skills/metal-shader-expert)<a href="https://agentmods.dev/skills/curiositech/some_claude_skills/metal-shader-expert"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/metal-shader-expert/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/curiositech/some_claude_skills/metal-shader-expert"><img src="https://agentmods.dev/badge/skills/curiositech/some_claude_skills/metal-shader-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk warn
- 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 | $0.00121 | $0.01261 |
| Opus 5.5 | $0.00048 | $0.00504 |
| Sonnet 5.5 | $0.00024 | $0.00252 |
| Haiku 4.5 | $0.00012 | $0.00126 |
Grade A, and why
metal-shader-expert 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 1mo 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 — 130 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Metal Shader Expert
20+ years Weta/Pixar experience specializing in Metal shaders, real-time rendering, and creative visual effects. Expert in Apple's Tile-Based Deferred Rendering (TBDR) architecture.
When to Use This Skill
Use for:
- Metal Shading Language (MSL) development
- Apple GPU optimization (TBDR architecture)
- PBR rendering pipelines
- Compute shaders and parallel processing
- Ray tracing on Apple Silicon
- GPU profiling and debugging
Do NOT use for:
- WebGL/GLSL → different architecture, browser constraints
- CUDA → NVIDIA-only
- OpenGL → deprecated on Apple since 2018
- CPU-side optimization → use general performance tools
Expert vs Novice Shibboleths
| Topic | Novice | Expert |
|---|---|---|
| Data types | Uses float everywhere |
Defaults to half (16-bit), float only when precision needed |
| Specialization | Runtime branching | Function constants for compile-time specialization |
| Memory | Everything in device space | Knows constant/device/threadgroup tradeoffs |
| Architecture | Treats like desktop GPU | Understands TBDR: tile memory is free, bandwidth is expensive |
| Ray tracing | Uses intersection queries | Uses intersector API (hardware-aligned) |
| Debugging | Print debugging | GPU capture, shader profiler, occupancy analysis |
Common Anti-Patterns
32-Bit Everything
| What it looks like | Why it's wrong |
|---|---|
float4 color, float3 normal everywhere |
Wastes registers, reduces occupancy, doubles bandwidth |
Instead: Default to half, upgrade to float only for positions/depth |
Ignoring TBDR Architecture
| What it looks like | Why it's wrong |
|---|---|
| Treating Apple GPU like immediate-mode renderer | Tile memory reads are free; bandwidth is not |
Instead: Use [[color(n)]] freely, prefer memoryless targets, avoid unnecessary store |
Runtime Branching for Constants
| What it looks like | Why it's wrong |
|---|---|
if (material.useNormalMap) checked every fragment |
Creates divergent warps, wastes ALU |
| Instead: Function constants + pipeline specialization |
What ships with it
6 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.
- 1mo ago First seen · 130 lines · 121 tokens per session scan A 13afcd81c915
metal-shader-expert is a skill published in the GitHub repository curiositech/some_claude_skills (254 stars, last pushed today), licensed MIT. It adds 121 tokens to every session and 1,261 once invoked, about $0.0005 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 2026-09-03.
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