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Agent skill

Htmlhint

by managedcode in managedcode/dotnet-skills

Use HTMLHint in .NET repositories that ship static HTML output or standalone frontend templates.

MITAuto-check passedDevelopment

Install Htmlhint

skills CLI
$ npx skills add managedcode/dotnet-skills --skill htmlhint -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install managedcode/dotnet-skills htmlhint --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/managedcode/dotnet-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/catalog/Tools/HTMLHint/skills/htmlhint .claude/skills/htmlhint && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
htmlhint
GitHub stars
486
Token cost
~1.2k tokens
SKILL.md length
594 words
Files
2
Skills in repo
81
Repo updated
First seen
Licence
MIT

At a glance

Use HTMLHint in .NET repositories that ship static HTML output or standalone frontend templates.

  • Works in 7 steps: Choose the right target first → Prefer repo-local installation and… → Keep HTMLHint focused on static HTML… → …
  • : static HTML files
  • SKILL.md covers Trigger On, Do Not Use For, Inputs and Workflow, plus 6 more sections
  • Calls rg, npx and npm

What it does

Htmlhint is an agent skill from managedcode/dotnet-skills. Use HTMLHint in .NET repositories that ship static HTML output or standalone frontend templates. USE FOR: static HTML files; generated frontend output; standalone templates under wwwroot, dist, or other web folders; HTML structure checks. DO NOT USE FOR: raw .cshtml or .razor source with server-side directives; JavaScript or TypeScript linting. INVOKES: inspect the repository context, edit targeted files, and run relevant build, test, lint, or validation commands when changes are made.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `manifest.json`). Compatibility notes: Requires a .NET repository with static HTML assets or generated frontend output; use on rendered output rather than raw Razor or Blazor source files.

It sits in Development, covering Linting and formatting, Backend development and HTML artifacts. It works with .NET, JavaScript, TypeScript and npm. The repository describes itself as: Installable .NET skill catalog and CLI for Codex, Claude Code, GitHub Copilot, and Gemini. The licence is MIT.

When your agent uses it

  • : static HTML files
  • Generated frontend output
  • Standalone templates under wwwroot
  • Other web folders

Example prompts

  • “/htmlhint”

Requirements

  • Node.js
  • Compatibility (from SKILL.md): Requires a .NET repository with static HTML assets or generated frontend output; use on rendered output rather than raw Razor or Blazor source files.

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Choose the right target first
  2. Prefer repo-local installation and checked-in config for repeatable runs.
  3. Keep HTMLHint focused on static HTML correctness and lightweight policy.
  4. Add narrow scripts to package.json, for example
  5. If the repo has templating syntax that confuses the parser, lint the rendered output instead of forcing source templates through the tool.
  6. Use rule overrides deliberately for real project conventions; do not disable broad classes of checks just to make a noisy first pass green.
  7. Rerun the publish or frontend build flow if fixes touched generated or packaged HTML sources.

What it can do on your machine

Read from SKILL.md and the folder at commit 535dd55. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Shell commands in SKILL.md call:

    • rg
    • npx
    • npm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use npx and npm, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    Requires a .NET repository with static HTML assets or generated frontend output; use on rendered output rather than raw Razor or Blazor source files.

    From compatibility in the SKILL.md frontmatter.

Context cost

Htmlhint loads about 1.2k tokens when it runs. Until then it costs about 125 tokens; SKILL.md has 594 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~125
When it runs · the whole SKILL.md, loaded when a task matches
~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from managedcode/dotnet-skills at commit 535dd55, republished under its MIT licence (© managedcode). 594 words, ~1,237 tokens.

Download SKILL.mdSave it as .claude/skills/htmlhint/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
htmlhint
description
Use HTMLHint in .NET repositories that ship static HTML output or standalone frontend templates. USE FOR: static HTML files; generated frontend output; standalone templates under wwwroot, dist, or other web folders; HTML structure checks. DO NOT USE FOR: raw .cshtml or .razor source with server-side directives; JavaScript or TypeScript linting. INVOKES: inspect the repository context, edit targeted files, and run relevant build, test, lint, or validation commands when changes are made.
compatibility
Requires a .NET repository with static HTML assets or generated frontend output; use on rendered output rather than raw Razor or Blazor source files.

HTMLHint for Static HTML in .NET Repositories

Trigger On

  • the repo has static HTML files, generated frontend output, or standalone templates under wwwroot/, dist/, or other web folders
  • the user asks for HTML structure checks, invalid attribute detection, or basic DOM-quality linting
  • the repo wants a narrow HTML gate separate from JS, CSS, and full-site runtime audits

Do Not Use For

  • raw .cshtml or .razor source with server-side directives; lint the rendered or published output instead
  • JavaScript or TypeScript linting; route that to eslint
  • runtime performance, accessibility, SEO, or headers; route that to webhint

Inputs

  • the nearest AGENTS.md
  • package.json
  • .htmlhintrc or equivalent config if present
  • the real static HTML target: source templates, built output, or deployed URL

Workflow

  1. Choose the right target first:
    • static HTML source files
    • generated build output such as dist/
    • a reachable URL when the page is already served
  2. Prefer repo-local installation and checked-in config for repeatable runs.
  3. Keep HTMLHint focused on static HTML correctness and lightweight policy.
  4. Add narrow scripts to package.json, for example:
    • htmlhint "dist/**/*.html"
    • htmlhint "wwwroot/**/*.html"
  5. If the repo has templating syntax that confuses the parser, lint the rendered output instead of forcing source templates through the tool.
  6. Use rule overrides deliberately for real project conventions; do not disable broad classes of checks just to make a noisy first pass green.
  7. Rerun the publish or frontend build flow if fixes touched generated or packaged HTML sources.

Bootstrap When Missing

  1. Detect current state:
    • rg --files -g 'package.json' -g '.htmlhintrc*' -g '*.html'
    • rg -n '"htmlhint"' --glob 'package.json' .
  2. Prefer a repo-local install:
    • npm install --save-dev htmlhint
  3. Add or refine .htmlhintrc only after confirming the actual target files.
  4. Add repeatable commands to AGENTS.md and package.json, then verify with:
    • npx htmlhint "dist/**/*.html"
    • npx htmlhint https://example.com
  5. Return status: configured if HTMLHint now owns a clear static-HTML gate, or status: improved if the existing setup was tightened.
  6. Return status: not_applicable when the repo's HTML is primarily server-rendered templates that should be validated after rendering instead.
Show full SKILL.md (257 more words)Show less

Handle Failures

  • Parser noise on Razor, Blazor, or other server-side template syntax is a target-selection problem; lint built output instead of source templates.
  • URL-based checks can fail on auth, SPA routing, or environment drift; verify the served target is reachable and stable before trusting the result.
  • Large volumes of trivial attribute warnings usually mean the config was copied from another stack and needs to be adapted to the repo's real HTML conventions.

Deliver

  • a repeatable static HTML lint gate
  • clear targeting rules for source HTML versus rendered output
  • checked-in config that matches the repo's actual page structure

Validate

  • the lint target contains real static HTML, not unsupported template syntax
  • commands are reproducible from repo-local dependencies
  • HTMLHint ownership is kept separate from broader site-audit tooling
  • fixes were verified on the built or served output that actually ships

Ralph Loop

  1. Plan: analyze current state, target outcome, constraints, and risks.
  2. Execute one step and produce a concrete delta.
  3. Review the result and capture findings.
  4. Apply fixes in small batches and rerun checks.
  5. Update the plan after each iteration.
  6. Repeat until outcomes are acceptable.
  7. If a dependency is missing, bootstrap it or return status: not_applicable with a reason.
Required Result Format
  • status: complete | clean | improved | configured | not_applicable | blocked
  • plan: concise plan and current step
  • actions_taken: concrete changes made
  • verification: commands, checks, or review evidence
  • remaining: unresolved items or none

Example Requests

  • "Add HTMLHint for the built static site in this repo."
  • "Lint the generated HTML before deployment."
  • "Why is HTMLHint failing on Razor pages?"

© managedcode, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in catalog/Tools/HTMLHint/skills/htmlhint of managedcode/dotnet-skills.

  • SKILL.md
  • manifest.json

Open the folder on GitHubat commit 535dd55

Compare with similar skills

Htmlhint next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Htmlhint compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Htmlhint this skillmanagedcode/dotnet-skills486—~1.2kAutomated safety check: PassMIT
Install Anti-Slop Oxlint Rulesdmmulroy/anti-slop5.2k—~2.2kAutomated safety check: PassMIT
Prepare Rslint npm Releaseweb-infra-dev/rslint460—~1.5kAutomated safety check: PassMIT
Git HooksProrise-cool/Claude-Code-Multi-Agent305—~3.6kAutomated safety check: NotesNone
Corvus Typescript Evaluatorcorvus-dotnet/Corvus.JsonSchema199—~1.3kAutomated safety check: PassApache-2.0
Develop ExtensionPostHog/posthog-js613—~2.3kAutomated safety check: PassCustom licence

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Works with

Categories

Questions about Htmlhint

What does Htmlhint do?

Use HTMLHint in .NET repositories that ship static HTML output or standalone frontend templates. Htmlhint is an agent skill from managedcode/dotnet-skills.NET repositories that ship static HTML output or standalone frontend templates.

When should I use Htmlhint?

Htmlhint fits situations like: : static HTML files; generated frontend output; standalone templates under wwwroot; other web folders.

How do I install Htmlhint in Claude Code?

Run `npx skills add managedcode/dotnet-skills --skill htmlhint -a claude-code`. Or copy the skill folder (catalog/Tools/HTMLHint/skills/htmlhint in managedcode/dotnet-skills) into .claude/skills/htmlhint in your project. Claude Code loads it when a task matches its description.

How do I install Htmlhint in Codex?

Run `npx skills add managedcode/dotnet-skills --skill htmlhint -a codex`. Or copy the skill folder (catalog/Tools/HTMLHint/skills/htmlhint in managedcode/dotnet-skills) into .agents/skills/htmlhint in your project. Codex loads it when a task matches its description.

Can I use Htmlhint in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add managedcode/dotnet-skills --skill htmlhint -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/htmlhint, .gemini/skills/htmlhint, .github/skills/htmlhint and .opencode/skills/htmlhint in your project.

What does Htmlhint need to run?

Going by SKILL.md and its folder, Htmlhint needs the command-line tools its instructions call (rg, npx and npm). Our summary lists: Node.js. Compatibility (from SKILL.md): Requires a .NET repository with static HTML assets or generated frontend output; use on rendered output rather than raw Razor or Blazor source files..

Does Htmlhint access the network?

SKILL.md contains no URLs. Its commands use npx and npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Htmlhint safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Htmlhint use?

Htmlhint is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Htmlhint use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Htmlhint?

Skills that share tags, products or a category with Htmlhint: Install Anti-Slop Oxlint Rules (dmmulroy/anti-slop, 5.2k stars), Prepare Rslint npm Release (web-infra-dev/rslint, 460 stars), Git Hooks (Prorise-cool/Claude-Code-Multi-Agent, 305 stars) and Corvus Typescript Evaluator (corvus-dotnet/Corvus.JsonSchema, 199 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Htmlhint?

managedcode (a GitHub organization) maintains it in managedcode/dotnet-skills, which has 486 GitHub stars. The repository holds 81 skills in this directory. The repository was last updated on October 7, 2026.

Source: managedcode/dotnet-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.