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.
npx skills add EastSun5566/hackmd-skills --skill hackmdgit clone --depth 1 https://github.com/EastSun5566/hackmd-skillsWrote 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.
[](https://agentmods.dev/skills/eastsun5566/hackmd-skills/hackmd)<a href="https://agentmods.dev/skills/eastsun5566/hackmd-skills/hackmd"><img src="https://agentmods.dev/badge/skills/eastsun5566/hackmd-skills/hackmd/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.
<a href="https://agentmods.dev/skills/eastsun5566/hackmd-skills/hackmd"><img src="https://agentmods.dev/badge/skills/eastsun5566/hackmd-skills/hackmd.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00053 | $0.02237 |
| Opus 5.5 | $0.00021 | $0.00895 |
| Sonnet 5.5 | $0.00011 | $0.00447 |
| Haiku 4.5 | $0.00005 | $0.00224 |
Grade A, and why
hackmd 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 327 lines — stays where its author put it; the contents beside it link to each section on GitHub.
HackMD Flavored Markdown Skill
Create HackMD documents with Markdown, diagrams, and embeds, or organize linked notes into a Book mode reading guide. Use the user's requested language for generated content.
Metadata (YAML Front Matter)
When YAML metadata is enabled, put the frontmatter at the very top of the note:
---
title: My Note
description: Shown in link previews
image: https://example.com/cover.png
tags: feature, documentation, v2.0
robots: noindex
lang: en
dir: ltr
breaks: true
---
Common YAML fields: title, description, image, tags, robots, lang, dir, breaks (render single line breaks), and slideOptions. YAML type: slide or type: book does not switch the note's mode; use the UI or a mode-specific URL as described below.
- Initial title: when a creation tool does not supply one, HackMD can derive it from YAML
title, otherwise the first H1 (# Heading), otherwise "Untitled". - Initial tags: when a creation tool does not supply them, HackMD can derive them from YAML
tagsor the legacy inline format below. - Permissions and the remaining settings live in the editor's Share / Settings menus.
Saved note settings take precedence over matching YAML fields. To update an existing note's title or tags, use the title/tag controls, Note settings, or fields explicitly supported by the chosen tool. Editing YAML, H1, or H6 text alone is not a reliable way to update saved metadata. If a YAML setting seems ineffective, check the saved settings first. See the metadata changes and current note settings guides.
Tags (Legacy Inline Format)
Recognize this format in older notes or when deriving initial tags:
###### tags: `feature` `documentation` `v2.0`
Table of Contents
Auto-generate ToC with:
[TOC]
This will be replaced with a hierarchical list of headers.
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.
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.
- 3d ago Changed · -17 lines · +4 tokens per session 1a9016dff3e3
- 5d ago Changed b6db1b4513d3
- 14d ago Changed · -219 lines · -2 tokens per session 3915fb8322a9
- 1mo ago First seen · 563 lines · 51 tokens per session scan A a39f05d8eb3d
hackmd is a skill published in the GitHub repository EastSun5566/hackmd-skills (2 stars, last pushed 4d ago), licensed MIT. It adds 53 tokens to every session and 2,237 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-31.
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