dotnet-biome

dotnet-biome is a skill for Claude Code, Codex from Postpartum-genushyacinthus29/dotnet-skills. It costs 68 tokens per session (1,176 once invoked), scanned A, a copy of biome, MIT.

A setup guide for Biome, a single tool that formats and checks frontend files such as JavaScript, TypeScript, CSS, JSON, GraphQL, and HTML.

In plain words
What is it for?
Use it to configure Biome in a .NET repository with frontend files, either alongside ESLint or as the main frontend checker.
Why use it?
It can reduce the need to coordinate separate formatting, linting, and import-order tools. It also helps keep local and CI checks on the same version.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions AGENTS.md.

Good fit Use it to configure Biome in a .NET repository with frontend files, either alongside ESLint or as the main frontend checker.

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Install with agentmods
npx agentmods add skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome
Install

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.

Any agent
npx skills add Postpartum-genushyacinthus29/dotnet-skills --skill dotnet-biome
Clone the repo
git clone --depth 1 https://github.com/Postpartum-genushyacinthus29/dotnet-skills

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for dotnet-biome

README.md
[![agentmods](https://agentmods.dev/badge/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome/github.svg)](https://agentmods.dev/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome)
Your own site
<a href="https://agentmods.dev/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome"><img src="https://agentmods.dev/badge/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome/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.

agentmods 80×15 button for dotnet-biome

Your own site · 80×15
<a href="https://agentmods.dev/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome"><img src="https://agentmods.dev/badge/skills/postpartum-genushyacinthus29/dotnet-skills/dotnet-biome.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,176 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 88% copy Near-identical to another mod in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00068 $0.01176
Opus 5 $0.00034 $0.00588
Sonnet 5 $0.00014 $0.00235
Haiku 4.5 $0.00007 $0.00118

Measured 12d ago against content hash 71a7ba8623f9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

dotnet-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 12d 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.

Origin

This is a copy

88% identical to biome — 18 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/dotnet-biome/SKILL.md · 106 lines

How it starts

The opening of the file, as written. The whole thing — 106 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 dotnet-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.json
  • biome.json or biome.jsonc
  • current ownership across ESLint, Prettier, Stylelint, and import ordering

Workflow

  1. Decide ownership first:
    • Biome as the main formatter and linter
    • Biome only for formatting
    • Biome in coexistence with ESLint for plugin gaps
  2. Prefer a repo-local pinned install so CI and developer machines use the same version.
  3. Generate biome.json only after confirming what the repo wants Biome to own.
  4. Add repeatable scripts to package.json, for example:
    • biome check .
    • biome check . --write
  5. 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
  6. Start migrations with check and bounded folders before flipping the whole repo to --write.
  7. Re-run the frontend build and tests after broad formatting or lint-fix passes.

Bootstrap When Missing

  1. Detect current state:
    • rg --files -g 'package.json' -g 'biome.json*'
    • rg -n '"@biomejs/biome"|"eslint"|"prettier"|"stylelint"' --glob 'package.json' .
  2. Prefer a repo-local pinned install:
    • npm i -D -E @biomejs/biome
  3. Create config deliberately:
    • npx @biomejs/biome init
  4. Add repeatable commands to AGENTS.md and package.json, then verify with:
    • npx @biomejs/biome check .
    • npx @biomejs/biome check . --write
  5. Return status: configured if Biome is now wired with explicit ownership, or status: improved if the existing setup was tightened.
  6. Return status: not_applicable when the repo intentionally stays on ESLint-centered ownership and no migration or comparison was requested.

Read the full file on GitHub · 106 lines

Changes

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.

  1. 12d ago First seen · 106 lines · 68 tokens per session scan A 71a7ba8623f9

Subscribe to this mod's changes

dotnet-biome is a skill published in the GitHub repository Postpartum-genushyacinthus29/dotnet-skills (10 stars, last pushed yesterday), licensed MIT. It adds 68 tokens to every session and 1,176 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to biome, differing in 18 lines, and is treated as a copy.

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