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 agentmods add skills/vchelaru/flatredball2/shadersnpx skills add vchelaru/FlatRedBall2 --skill shadersgit clone --depth 1 https://github.com/vchelaru/FlatRedBall2Wrote 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/vchelaru/flatredball2/shaders)<a href="https://agentmods.dev/skills/vchelaru/flatredball2/shaders"><img src="https://agentmods.dev/badge/skills/vchelaru/flatredball2/shaders.svg" alt="Measured on agentmods" 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 | $0.00032 | $0.00425 |
| Opus 5 | $0.00016 | $0.00212 |
| Sonnet 5 | $0.00006 | $0.00085 |
| Haiku 4.5 | $0.00003 | $0.00042 |
Grade A, and why
shaders 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 yesterday.
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.
What it actually says
Shaders in FlatRedBall2
Apos.Shapes
FlatRedBall2's built-in shape rendering (ShapesBatch) uses Apos.Shapes, whose shader is embedded directly in the package assembly (0.7.2+) — no content pipeline, no .xnb, no Wine dependency. The version is centralized in $(AposShapesVersion) in the repo's Directory.Packages.props; sample and template projects inherit it transitively and must not pin it themselves (see issue #495).
Custom Shaders
Adding your own .fx files to a project requires the MonoGame/KNI content pipeline to compile them at build time.
Windows
Install the Visual C++ 2013 Redistributable (x64) — the content pipeline's libmojoshader_64.dll depends on it:
winget install Microsoft.VCRedist.2013.x64
Or download from https://www.microsoft.com/download/details.aspx?id=40784.
Without it, builds fail with:
Unable to load DLL 'libmojoshader_64.dll' or one of its dependencies.
macOS and Linux
The MonoGame content pipeline uses Windows-only tools for shader compilation. Wine must be installed.
Follow the MonoGame setup guide: https://docs.monogame.net/articles/tutorials/building_2d_games/02_getting_started/index.html?tabs=macos#setup-wine-for-effect-compilation-macos-and-linux-only
For OpenGL/WebGL/DirectX targets, ShadowDusk compiles cross-platform without Wine — see the shadowdusk skill. Metal still requires the Wine path above.
KNI Backend
Shader compilation is not supported on macOS or Linux with the KNI backend. KNI projects must have their shaders compiled on Windows.
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.
- yesterday First seen · 43 lines · 32 tokens per session scan A 3c885fc50d06
shaders is a skill published in the GitHub repository vchelaru/FlatRedBall2 (14 stars, last pushed yesterday), licensed MIT. It adds 32 tokens to every session and 425 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 2026-09-04.
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