blog-post

blog-post is a skill for Claude Code, Codex from nteract/semiotic. It costs 44 tokens per session (3,355 once invoked), scanned A, original, Apache-2.0.

A writing guide for adding an article to the Semiotic blog, a publication about the Semiotic data-visualization library.

In plain words
What is it for?
It is for chart explainers, release summaries, and narrative case studies saved under a blog URL slug.
Why use it?
It gives different kinds of posts a consistent structure and requires explaining why the topic matters to readers who may not use the library.

Skill for Claude CodeCodex

About the project

Semiotic is a React library for building data visualizations such as charts, network graphs, streaming displays, and coordinated dashboards. It is used by developers who need to render data-driven interfaces, including with AI coding assistants. Its schemas and MCP server support the catalogue's add-ons for generating chart code.

nteract/semiotic · 2,691 stars · on GitHub

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.

agentmods
npx agentmods add skills/nteract/semiotic/blog-post
Any agent
npx skills add nteract/semiotic --skill blog-post
Clone the repo
git clone --depth 1 https://github.com/nteract/semiotic

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 blog-post

README.md
[![agentmods](https://agentmods.dev/badge/skills/nteract/semiotic/blog-post.svg)](https://agentmods.dev/skills/nteract/semiotic/blog-post)
Your own site
<a href="https://agentmods.dev/skills/nteract/semiotic/blog-post"><img src="https://agentmods.dev/badge/skills/nteract/semiotic/blog-post.svg" alt="Measured on agentmods" height="20"></a>
Per session 44 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,355 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00044 $0.03355
Opus 5 $0.00022 $0.01677
Sonnet 5 $0.00009 $0.00671
Haiku 4.5 $0.00004 $0.00335

Measured 5d ago against content hash c5f054b7c16f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

blog-post 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 5d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (templates/chart-explainer.js, templates/narrative.js, templates/release-summary.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.agents/skills/blog-post/SKILL.md · 335 lines

How it starts

The opening of the file, as written. The whole thing — 335 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Writing a Semiotic blog post

This skill writes one entry for the Semiotic blog. The blog lives at /blog/; entries live at /blog/<slug>/. Three story shapes are supported — pick the one that matches what's being written:

  1. Chart explainer — single chart, "what / why / when / wiring".
  2. Release summary — what's new in a version, ordered by impact.
  3. Narrative / case study — comparative posts ("X vs Y"), walkthroughs, recreations of historical visualizations.

Every entry follows the same structure regardless of shape. The why-care section is non-negotiable: the post has to give the reader a reason to read it that lands even if they're not currently using Semiotic. The blog isn't reference docs; it's a publication that happens to be hosted on the docs site.

Before writing anything

Ask the user for the author byline unless they've already given one. Don't assume "Elijah Meeks" by default — many entries will be co-authored or attributed to "Semiotic Team" for releases. One short question, then proceed.

File structure

For a new entry with slug <slug>:

  1. Body componentdocs/src/blog/entries/<slug>.jsx. Default export is { slug, title, subtitle, author, date, tags, excerpt, component, ogChart? }. The component is a React function returning JSX (the entry's body — no header, no chrome, the BlogEntryView wraps it).
  2. Register in registrydocs/src/blog/entries.js imports the new file and adds it to blogEntries.
  3. Register in metadata mirrordocs/src/blog/entries-meta.js gets the same metadata object (without component, without the React imports). This mirror is read by the OG-card generator and the prerender script, both of which run under plain Node and can't load JSX.

Both registry files must stay in sync. The OG-card generator and prerender script read entries-meta.js; the React app reads entries.js.

Required fields

{
  slug: "kebab-case-route",
  title: "Title-Case Headline",
  subtitle: "One or two sentences orienting the reader.",
  author: "Author Name",                  // ASK THE USER if unspecified
  date: "YYYY-MM-DD",                     // ISO; controls sort order
  tags: ["release"] | ["chart-explainer", "xy"] | ...,
  excerpt: "2–3 sentence preview shown on the index card.",
  component: Body,                        // function returning JSX
  ogChart: { component: "DifferenceChart" }, // optional, see OG step
}

Read the full file on GitHub · 335 lines

Files

What ships with it

3 files 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.

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. 5d ago First seen · 335 lines · 44 tokens per session scan A c5f054b7c16f

Subscribe to this mod's changes

blog-post is a skill published in the GitHub repository nteract/semiotic (2,691 stars, last pushed 3d ago), licensed Apache-2.0. It adds 44 tokens to every session and 3,355 once invoked, about $0.0002 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 2026-08-30.

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