A writing helper that turns work done in MulmoClaude into a Zenn tech article in Markdown. Zenn is a Japanese platform for publishing technical articles, and the helper creates or uses a Zenn project in the workspace.

Use it to initialize a Zenn project and write articles under its articles folder, ready to sync through GitHub.

It removes the setup work and file-handling details needed before publishing an article. You can focus on describing the work instead of managing the Zenn project structure.

mc-zenn — Skill for Claude Code and Codex by receptron

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 receptron/mulmoclaude --skill mc-zenn

Clone the repo

git clone --depth 1 https://github.com/receptron/mulmoclaude

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/receptron/mulmoclaude/mc-zenn/github.svg)](https://agentmods.dev/skills/receptron/mulmoclaude/mc-zenn)

Your own site

<a href="https://agentmods.dev/skills/receptron/mulmoclaude/mc-zenn"><img src="https://agentmods.dev/badge/skills/receptron/mulmoclaude/mc-zenn/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/receptron/mulmoclaude/mc-zenn"><img src="https://agentmods.dev/badge/skills/receptron/mulmoclaude/mc-zenn.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 137 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,117 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. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 5 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 51
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 56
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 58
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 90
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 144
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]

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.

Model	Per session	Once invoked
Fable 5.1	$0.00137	$0.02117
Opus 5	$0.00068	$0.01059
Sonnet 5	$0.00027	$0.00423
Haiku 4.5	$0.00014	$0.00212

Measured 11d ago against content hash d16e828ee25f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

mc-zenn 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 11d 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.

packages/core/assets/skills-preset/mc-zenn/SKILL.md · 168 lines

How it starts

The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Zenn

A bundled MulmoClaude preset skill (mc- prefix = launcher-managed; do not edit this file in the workspace, it is overwritten on every server boot).

Help the user share what they did in MulmoClaude as a Zenn tech article. Two jobs in one skill: (1) make sure a Zenn project exists in the workspace and (2) write an article from the work. Writing auto-runs setup first when the project isn't there yet, so the user can jump straight to "Zenn にまとめて" without thinking about setup.

Keep the machinery invisible — the user shouldn't have to think about slugs, frontmatter, or zenn-cli internals.

Where things live

The Zenn project is a git repo inside the workspace at github/zenn/ (cwd-relative — the agent runs with cwd = workspace, so every path here is plain cwd-relative). Articles are markdown files at github/zenn/articles/<slug>.md. Zenn publishes by syncing a connected GitHub repo, so this directory is a real git repo the user pushes to.

Is it initialized? The project is ready when github/zenn/articles/ exists. Use that as the idempotency marker — never re-init a directory that already has it.

Workflow 1: set up the Zenn project (idempotent)

Triggers: "Zenn のリポを用意して", "Zenn 始めたい", "set up Zenn", "まだ Zenn 作ってない". Also runs automatically as Step 0 of Workflow 2.

Step 1 — check first. If github/zenn/articles/ already exists, the project is ready: say so in one line and stop. Re-initializing is never correct. Only continue when it's missing.

Step 2 — clone or init. Ask which with one presentForm (two choices), unless the user already told you:

Clone an existing Zenn repo (they already write Zenn on GitHub). Get the repo URL, then:
```
git clone <url> github/zenn
```
npx zenn fetches zenn-cli on demand, so a missing local dependency is fine.
Create a fresh project (standard zenn-cli flow):
```
mkdir -p github/zenn
cd github/zenn && npm init --yes && npm install zenn-cli && npx zenn init
```
(yarn add zenn-cli works too if the user prefers yarn.) npx zenn init scaffolds articles/, books/, and a README. Then make it a git repo:
```
cd github/zenn && git init -b main
```

Read the full file on GitHub · 168 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.

11d ago First seen · 168 lines · 137 tokens per session scan A d16e828ee25f

Subscribe to this mod's changes

mc-zenn is a skill published in the GitHub repository receptron/mulmoclaude (347 stars, last pushed today), licensed MIT. It adds 137 tokens to every session and 2,117 once invoked, about $0.0007 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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