webjs: Skill for Claude Code

.claude/skills/webjs-blog-write/SKILL.md

webjs-blog-write is a skill for Claude Code from webjsdev/webjs. It costs 133 tokens per session (3,377 once invoked), scanned A, original, MIT.

A writing guide for creating or substantially editing engineering or marketing posts in a website’s blog folder. It uses the existing posts to match the author’s voice and sets rules for accurate, search-friendly writing.

In plain words
What is it for?
Use it when drafting or revising a WebJs blog post stored as a Markdown file. It helps shape the structure, tone, search wording, code explanations, and final copy.
Why use it?
It prevents new posts from sounding inconsistent or containing unsupported claims. It also helps keep the blog’s required file format and publishing conventions intact.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter. Also seen: reads .claude/ paths; mentions AGENTS.md.

This is webjsdev/webjs's own configuration. It tells Claude Code how to work on webjs itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything webjs configures →

Reuse

Borrowing it

Nothing to install: this file belongs to webjsdev/webjs. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/webjsdev/webjs/main/.claude/skills/webjs-blog-write/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/webjsdev/webjs

Made for: Claude Code.

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 webjs-blog-write

README.md
[![agentmods](https://agentmods.dev/badge/skills/webjsdev/webjs/webjs-blog-write/github.svg)](https://agentmods.dev/skills/webjsdev/webjs/webjs-blog-write)
Your own site
<a href="https://agentmods.dev/skills/webjsdev/webjs/webjs-blog-write"><img src="https://agentmods.dev/badge/skills/webjsdev/webjs/webjs-blog-write/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 webjs-blog-write

Your own site · 80×15
<a href="https://agentmods.dev/skills/webjsdev/webjs/webjs-blog-write"><img src="https://agentmods.dev/badge/skills/webjsdev/webjs/webjs-blog-write.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 133 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,377 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to high

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 →

  • high Rogue Agent · line 26
    Skill modifies its own code, configuration, or behavior at runtime. Self-modification enables an agent to escalate privileges, disable safety constraints, or install persistent backdoors.
    Fix: Prevent the skill from modifying its own code, SKILL.md, or configuration files. Treat skill files as read-only at runtime.
How audits are shown
Origin original No closer match found 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 $0.00133 $0.03377
Opus 5.5 $0.00053 $0.01351
Sonnet 5.5 $0.00027 $0.00675
Haiku 4.5 $0.00013 $0.00338

Measured 1mo ago against content hash a3d0c30723e1, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

webjs-blog-write scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

3. **For a feature post, verify every factual claim by dogfooding before you publish.** This is not optional for a post that describes runtime behaviour. Scaffold a real app (`webjs create`) and run the verification's in
.claude/skills/webjs-blog-write/SKILL.md · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Write a webjs blog post

The repo publishes engineering blog posts from the repo-root blog/ directory. The website reads them directly (website/modules/blog/queries/list-posts.server.ts, BLOG_DIR = <repo>/blog), parses the front matter, and sorts by date descending. A post is one markdown file at blog/<slug>.md. This skill is how a new post lands in the author's voice, ranks for search, and states only claims that are actually true, without a later cleanup pass.

Step 0 (mandatory, do this FIRST): analyze the author's current style

Do NOT write from a fixed style spec. The voice is defined by the corpus, and the corpus changes over time, so a hard-coded spec goes stale. Before writing a single sentence:

  1. Read a broad sample of blog/*.md (at least six to eight posts spanning different topics and dates, including the two or three most recent by date). Read whole posts, not just the openings.
  2. From that reading, note for yourself: how the author opens a post, how paragraphs are paced, how code is introduced, how sections are titled, how a post closes, and which words and rhythms recur. The sections below capture what has been true so far, but the corpus you just read is the authority. If it has drifted from this description, follow the corpus and update this skill.

The patterns that have held so far (confirm them against what you read):

  • First person, opinionated, honest. The author writes as themselves ("I wanted the opposite", "kept biting me", "I did not find one I enjoyed using"). Personal origin and motivation are welcome.
  • A concrete hook, never a definition. Posts open on a scenario, an attack, a painful task, or a plain-language framing, not on "X is a...". A handful of posts use a signature "Let me start with..." or "Let me show you" opener; keep that phrasing where the author reaches for it, but the dependable pattern is the concrete hook itself, not the specific words.
  • Beginner-friendly. Every acronym or jargon term is expanded in parentheses on first use, for example "SSR (server-side rendering)" or "an async generator (a function that yields values over time instead of returning once)".
  • Second person in walkthroughs. Once into the mechanics, the author addresses "you" and shows real ts / sh code blocks.
  • The painful old way, then the WebJs way. Most feature posts show the tedious status-quo pattern first (a useEffect + spinner, thirty lines of optimistic bookkeeping, a native-addon compile), then the WebJs version that removes it.
  • Section headers are single #, sentence case, often with a trailing clause. For example "# The classic answer, and why it is fiddly" or "# What the sourcemap layer cost".
  • Length runs substantial, commonly around 1000 to 1600 words, with deeper posts closer to 2200. Match the length of comparable posts you read in Step 0. Substance over padding, and never pad to hit a number.
  • Vary the closing. Do NOT reach for a generic "# The takeaway" header. A closing header that repeats verbatim across the blog is the clearest formulaic tell there is, no matter how good each post is on its own. Most posts should just land their point in the final paragraph with no labeled closing section at all. When a post does want a labeled close, give it a header specific to that post's argument, and check that no other post already uses it. Treat any header that shows up on more than one or two posts as a smell.
  • Contrast with the tool the reader knows. React, Next.js, Rails, Lit, Remix, Astro. Explain what that tool does and why WebJs chose differently, on WebJs's own terms.

Read the full file on GitHub · 104 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. 1mo ago First seen · 104 lines · 133 tokens per session scan A a3d0c30723e1

Subscribe to this mod's changes

webjs-blog-write is a skill published in the GitHub repository webjsdev/webjs (27 stars, last pushed 13d ago), licensed MIT. It adds 133 tokens to every session and 3,377 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.