What is ck:markdown-novel-viewer?

A local web viewer that displays Markdown files as calm, book-like pages, or shows directories as clickable file lists. Markdown is plain text formatted with simple symbols for headings, links, and other document structure.

Use it to read documentation, plans, reports, novels, or other Markdown files, and to browse folders containing them.

It makes long documents, reports, and notes easier to read than raw text in an editor or terminal. It also provides a browser-based preview of Markdown.

ck:markdown-novel-viewer — Skill for Claude Code and Codex by manhvann: A local web viewer that displays Markdown files as…

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/manhvann/codexkit/markdown-novel-viewer

Any agent

npx skills add manhvann/codexkit --skill markdown-novel-viewer

Clone the repo

git clone --depth 1 https://github.com/manhvann/codexkit

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/manhvann/codexkit/markdown-novel-viewer.svg)](https://agentmods.dev/skills/manhvann/codexkit/markdown-novel-viewer)

Your own site

<a href="https://agentmods.dev/skills/manhvann/codexkit/markdown-novel-viewer"><img src="https://agentmods.dev/badge/skills/manhvann/codexkit/markdown-novel-viewer.svg" alt="Measured on agentmods" height="20"></a>

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,347 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.

Model	Per session	Once invoked
Fable 5	$0.00041	$0.02347
Opus 5	$0.00020	$0.01174
Sonnet 5	$0.00008	$0.00469
Haiku 4.5	$0.00004	$0.00235

Measured 4d ago against content hash 4e57cdef3a18, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

ck:markdown-novel-viewer 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 4d ago.

The scan reads SKILL.md. This mod also ships 14 executable files (assets/reader.js, scripts/lib/http-server.cjs, scripts/lib/markdown-renderer.cjs, …), 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/markdown-novel-viewer/SKILL.md · 315 lines

How it starts

The opening of the file, as written. The whole thing — 315 lines — stays where its author put it; the contents beside it link to each section on GitHub.

markdown-novel-viewer

Background HTTP server rendering markdown files with calm, book-like reading experience.

⚠️ Installation Required

This skill requires npm dependencies. Run one of the following:

# Option 1: Install via Codex Kit CLI (recommended)
ck init  # Runs install.sh which handles all skills

# Option 2: Manual installation
cd .agents/skills/markdown-novel-viewer
npm install

Dependencies: marked, highlight.js, gray-matter

Without installation, you'll get Error 500: Error rendering markdown.

Purpose

Universal viewer - pass ANY path and view it:

Markdown files → novel-reader UI with serif fonts, warm theme
Directories → file listing browser with clickable links

Quick Start

# View a markdown file
node .agents/skills/markdown-novel-viewer/scripts/server.cjs \
  --file ./plans/my-plan/plan.md \
  --open

# Browse a directory
node .agents/skills/markdown-novel-viewer/scripts/server.cjs \
  --dir ./plans \
  --host 0.0.0.0 \
  --open

# Background mode
node .agents/skills/markdown-novel-viewer/scripts/server.cjs \
  --file ./README.md \
  --background

# Stop all running servers
node .agents/skills/markdown-novel-viewer/scripts/server.cjs --stop

Skill Command

Use $preview for quick access:

$preview plans/my-plan/plan.md    # View markdown file
$preview plans/                   # Browse directory
$preview --stop                   # Stop server

Features

Novel Theme

Warm cream background (light mode)
Dark mode with warm gold accents
Libre Baskerville serif headings
Inter body text, JetBrains Mono code
Maximum 720px content width

Mermaid.js Diagrams

Auto-renders mermaid code blocks as diagrams
Theme-aware (light/dark mode support)
Full-width toggle: Click diagram to expand/collapse
Error display with source preview for debugging

Directory Browser

Clean file listing with emoji icons
Markdown files link to viewer
Folders link to sub-directories
Parent directory navigation (..)
Light/dark mode support

Read the full file on GitHub · 315 lines

Files

What ships with it

29 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.

4d ago First seen · 315 lines · 41 tokens per session scan A 4e57cdef3a18

Subscribe to this mod's changes

ck:markdown-novel-viewer is a skill published in the GitHub repository manhvann/codexkit (88 stars, last pushed 5d ago), licensed MIT. It adds 41 tokens to every session and 2,347 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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