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 managedcode/dotnet-skills --skill biomegit clone --depth 1 https://github.com/managedcode/dotnet-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/managedcode/dotnet-skills/biome)<a href="https://agentmods.dev/skills/managedcode/dotnet-skills/biome"><img src="https://agentmods.dev/badge/skills/managedcode/dotnet-skills/biome.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 64 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 66 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 67 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00126 | $0.01630 |
| Opus 5 | $0.00063 | $0.00815 |
| Sonnet 5 | $0.00025 | $0.00326 |
| Haiku 4.5 | $0.00013 | $0.00163 |
Grade A, and why
biome 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 3d 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
2 near-identical copies found in the catalogue:
- dotnet-biome — 91% identical, 16 lines differ
- dotnet-biome — 88% identical, 18 lines differ
How it starts
The opening of the file, as written. The whole thing — 114 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Biome for Frontend Assets in .NET Repositories
Trigger On
- the repo has
biome.json,@biomejs/biome, or the user asks for a faster all-in-one frontend formatter-linter stack - the repo wants one tool for formatting, linting, and import organization across JS, TS, CSS, JSON, GraphQL, or HTML
- the team is comparing Biome against ESLint plus Prettier or wants to simplify the current stack
Do Not Use For
- repos that rely on ESLint plugins or framework-specific rules Biome does not cover yet
- runtime site audits such as headers, accessibility, and SEO; route that to
webhint - cases where a dedicated CSS or HTML tool is still the deliberate owner and no migration is requested
Inputs
- the nearest
AGENTS.md package.jsonbiome.jsonorbiome.jsonc- current ownership across ESLint, Prettier, Stylelint, and import ordering
Workflow
- Decide ownership first:
- Biome as the main formatter and linter
- Biome only for formatting
- Biome in coexistence with ESLint for plugin gaps
- Prefer a repo-local pinned install so CI and developer machines use the same version.
- Generate
biome.jsononly after confirming what the repo wants Biome to own. - Add repeatable scripts to
package.json, for example:biome check .biome check . --write
- Keep file ownership explicit:
- Biome can own formatting, linting, and import sorting
- webhint still owns site-runtime audits
- ESLint may stay for plugin-heavy cases the repo intentionally keeps
- Start migrations with
checkand bounded folders before flipping the whole repo to--write. - Re-run the frontend build and tests after broad formatting or lint-fix passes.
Current Upstream Notes
- Biome CLI
2.5.12fixes Astro expression parsing, nested JSX attribute sorting, Unicode stdin/stdout corruption, and repeated dependency scanning. Validate representative Astro/TSX files, Unicode input, and formatter idempotence before dropping workarounds. noFloatingPromisesnow handles cyclic imports and awaited Promise aliases more accurately; awaiting an array of Promises still leaves its elements unhandled. UsePromise.allor an explicit awaited loop when appropriate. New Nursery rules remain opt-in, includinguseFlatMathMinMax,useModernMathApis,noThisOutsideOfClass,noVueDeprecatedScopedSlots, andnoBunModules.
What ships with it
1 file 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.
- 3d ago Changed · +3 lines 523c595f1135
- 4d ago First seen · 111 lines · 126 tokens per session scan A 35b1a22521f6
biome is a skill published in the GitHub repository managedcode/dotnet-skills (477 stars, last pushed 2d ago), licensed MIT. It adds 126 tokens to every session and 1,630 once invoked, about $0.0006 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 2026-09-03.
Other skills, from other repositories
aksel-spacing
Lag responsive layouts med Aksel Design System (v8+) - spacing tokens, layout primitives (Box, HStack, VStack, HGrid, Page, Bleed) og ResponsiveProp.
web-design-reviewer
Visuell inspeksjon av nettsider for å identifisere og fikse designproblemer. Trigges av forespørsler som "sjekk designet", "gå gjennom UI-en", "fiks layouten", "finn designfeil". Finner problemer med responsivt design, tilgjengelighet, visuell konsistens og layout, og fikser dem i kildekoden.
playground
Creates interactive HTML playgrounds — self-contained single-file explorers that let users configure something visually through controls, see a live preview, and copy out a prompt. Use when the user asks to make a playground, explorer, or interactive tool for a topic.
fixing-motion-performance
Audit and fix animation performance issues including layout thrashing, compositor properties, scroll-linked motion, and blur effects. Use when animations stutter, transitions jank, or reviewing CSS/JS animation performance.
winui-design
Use when designing, reviewing, or fixing WinUI 3: sample and control discovery with winapp find-ui, layout planning, control choice, Fluent Design alignment, Light/Dark/High Contrast theming, typography, spacing, brushes, accessibility, and XAML data-binding design. Load before authoring new XAML, reviewing UI PRs…
antfu-design
Use this when building interfaces with UnoCSS in any framework (React, Vue, Svelte, Solid, or plain HTML), from dense devtools panels to landing pages. Read core-design-read first to set the direction, then apply the token system plus the polish and anti-slop rules.