A Markdown-based presentation tool that creates PDF and HTML slide decks using a 31C-branded visual theme. Markdown is plain text with simple formatting marks, and the output is not an editable PowerPoint file.

Use it to create a new deck, render an existing Markdown deck, transform workspace notes into slides, or watch changes during editing.

It gives a repeatable way to draft, render, or preview presentations from text files. It also supports live preview while a deck is being edited.

How mishahanin/heading-os configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mishahanin/heading-os. 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/mishahanin/heading-os/main/.claude/skills/marp/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/mishahanin/heading-os

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mishahanin/heading-os/marp/github.svg)](https://agentmods.dev/skills/mishahanin/heading-os/marp)

Your own site

<a href="https://agentmods.dev/skills/mishahanin/heading-os/marp"><img src="https://agentmods.dev/badge/skills/mishahanin/heading-os/marp/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/mishahanin/heading-os/marp"><img src="https://agentmods.dev/badge/skills/mishahanin/heading-os/marp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 90 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,977 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: 1 finding, 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 Excessive Agency · line 7
Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.

Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.

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	$0.00090	$0.01977
Opus 5	$0.00045	$0.00988
Sonnet 5	$0.00018	$0.00395
Haiku 4.5	$0.00009	$0.00198

Measured 5d ago against content hash 1274d0f564c3, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

marp 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.

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.

.claude/skills/marp/SKILL.md · 200 lines

How it starts

The opening of the file, as written. The whole thing — 200 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/marp - Markdown Presentation Pipeline

Render 31C-branded presentations from Markdown source. Outputs PDF and HTML. Not editable PPTX.

Subcommands

`/marp new <topic>`

Draft a full deck from a topic prompt.

Parse topic into purpose and audience. Ask one clarifying question only if truly ambiguous.
Generate outline:
- Cover slide (title layout, dark)
- One context or "why" slide
- Three to five main-point slides (one idea per slide, under 50 words each)
- One key-takeaway slide
- Closing slide
Default mode: mixed (dark cover, dark section-breaks, dark closing; light content slides).
Write source to outputs/deliverables/presentations/marp-source/YYYY-MM-DD-<slug>.md.
Run python3 scripts/marp_render.py render <source> to produce PDF and HTML.
Report: file paths, slide count, sanitizer status.

Flags: --slides N, --mode dark|light|mixed, --no-render, --title "override", --images png

If target filename exists, refuse to overwrite. Prompt for rename or --force.

`/marp render <path>`

Pure render of an existing .md source. No authoring.

python3 scripts/marp_render.py render <path> [--pdf-only] [--html-only] [--images png] [--output <dir>] [--verbose]

Renders PDF and HTML to the same directory as source, or to --output <dir>.

`/marp from <workspace-path>`

Transform any workspace markdown into slides without modifying the source.

python3 scripts/marp_render.py from <path> [--break-at h2|h3|manual] [--mode dark|light|mixed] [--title "..."] [--subtitle "..."] [--no-auto-cover] [--no-auto-closing] [--output <dir>] [--paginate-heavy] [--verbose]

Pre-processing (in-memory, source never mutated):

Strip existing YAML frontmatter from rendered body
Strip wiki-links: [[id]] becomes id, [[id|Display]] becomes Display
Insert slide breaks at configured heading level (default h2)
Auto-generate cover slide with title, date, source path
Auto-generate closing slide
Inject MARP frontmatter

Read the full file on GitHub · 200 lines

Files

What ships with it

10 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.

5d ago Changed · +1 lines 1274d0f564c3
9d ago First seen · 199 lines · 90 tokens per session scan A 7bec05590242

Subscribe to this mod's changes

marp is a skill published in the GitHub repository mishahanin/heading-os (11 stars, last pushed today), licensed Apache-2.0. It adds 90 tokens to every session and 1,977 once invoked, about $0.0005 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.

Claude Code Creative and media LLM Security ai-agent anthropic automation

heading-os: Skill for Claude Code

Borrowing it

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

/marp - Markdown Presentation Pipeline

Subcommands

`/marp new <topic>`

`/marp render <path>`

`/marp from <workspace-path>`

What ships with it

What this file has done since we first saw it

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