Borrowing it
Nothing to install: this file belongs to vchelaru/XnaFiddle. 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/vchelaru/XnaFiddle/main/.claude/skills/kernsmith/SKILL.mdgit clone --depth 1 https://github.com/vchelaru/XnaFiddleWrote 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/xnafiddle/kernsmith)<a href="https://agentmods.dev/skills/vchelaru/xnafiddle/kernsmith"><img src="https://agentmods.dev/badge/skills/vchelaru/xnafiddle/kernsmith/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/vchelaru/xnafiddle/kernsmith"><img src="https://agentmods.dev/badge/skills/vchelaru/xnafiddle/kernsmith.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 | $0.00000 | $0.00753 |
| Opus 5.5 | $0.00000 | $0.00301 |
| Sonnet 5.5 | $0.00000 | $0.00151 |
| Haiku 4.5 | $0.00000 | $0.00075 |
Grade A, and why
kernsmith 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 — 27 lines — stays where its author put it; the contents beside it link to each section on GitHub.
KernSmith
Runtime (in-memory) font rasterization library, wired into Gum's text rendering — not a general-purpose graphics library. See Examples/DynamicFonts.cs for the canonical usage pattern: BmFont.RegisterFont(name, ttfBytes) to register a font by name, then BmFont.GenerateFromSystem(...) to rasterize it, or let Gum trigger generation lazily via CustomSetPropertyOnRenderable.InMemoryFontCreator = new KernSmithFontCreator(GraphicsDevice, RasterizerBackend.StbTrueType).
Font resolution: "system" fonts don't exist in the browser
GenerateFromSystem(family, options) is the one API for resolving-by-family-name — it does not distinguish an OS-installed font from an in-memory one. In a normal .NET process it scans OS font directories/registry for family. In Blazor WASM there is no filesystem/registry to scan, so that path never finds anything — BmFont.RegisterFont(family, ttfBytes) is the only way to make a family resolvable, and registered fonts are checked before any OS scan. So in this repo (and any browser target), every font is effectively "uploaded," not "installed": a user's .ttf gets registered under a family name (see DynamicFonts.cs registering the bundled DroidSans.ttf before calling GenerateFromSystem("Droid Sans", ...)), and that same call would silently fail to find a real system font like "Arial" unless it happens to also be registered. Style variants (Bold/Italic) register separately per family+style.
KernSmith also ships a KernSmith.Fonts.Web package for fetching WOFF fonts from CDNs (Google/Bunny Fonts) as a WASM-friendly alternative to bundling .ttf bytes — not currently referenced by XnaFiddle's .csproj.
Landmine: rasterizer must be force-registered in WASM
Program.cs uses RuntimeHelpers.RunClassConstructor(typeof(StbTrueTypeRasterizer).TypeHandle) for KernSmith instead of the plain typeof(X) touch used for every other optional library (see the block above it). The StbTrueTypeRasterizer backend self-registers via a static constructor side effect, not by being referenced — a mere typeof touch loads the assembly but never runs the constructor, so the backend silently stays unregistered at runtime. If font generation fails only in the published/WASM build (not locally), check this line first.
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 · 27 lines · 0 tokens per session scan A ba78fcab066f
kernsmith is a skill published in the GitHub repository vchelaru/XnaFiddle (14 stars, last pushed today), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 753 tokens. 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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