Skillget

rapier

mcp
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  • License — License: AGPL-3.0
  • Description — Repository has a description
  • Active repo — Last push 0 days ago
  • Low visibility — Only 7 GitHub stars
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SUMMARY

Fast Markdown editor, notes, drawing and painting in a single HTML file. Android, Web, Windows. No accounts or data collection. Optional encrypted sync through your own Cloudflare account. Your agent works alongside you in real time over MCP.

README.md

Rapier

A fast Markdown editor for writing, drawing, painting and notes. One HTML file that runs offline on any device, with
no account.

  • On the web: rapier.website. Add it to your home screen; let the first load finish
    before going offline.
  • As a file: download rapier.html and open it in any
    browser.
  • On Android: the Rapier app on Google Play. It has no Internet permission.
  • On Windows: download Rapier.exe, the same editor as a desktop app.
  • With an agent: the Claude plugin, the ChatGPT app, or any MCP client at https://mcp.rapier.website/mcp.

What it does

  • Write. Edit the page or the Markdown source; source you did not touch stays byte for byte. Tables,
    checklists, callouts, footnotes, a table of contents, find and replace, compare, read aloud, right-to-left, light
    and dark.
  • Pictures. Stored inside the .md file; new rasters as JPEG XL from
    Rapier's own encoder. Text wraps around a picture's shape.
  • Draw. Editable SVG: pen, pressure brush, shapes, arrows that stay attached, text, backgrounds.
  • Paint and Water. MyPaint brushes, smudge and blend; Water, watercolour whose pigments mix, flow and dry on textured paper.
  • Notes. One Markdown file per note: colours, pins, checklists, reminders, links, history, and search that reads
    text in pictures. Imports from twenty notes apps. Backup as a zip; encrypted sync to your own Cloudflare
    storage, Google Drive, OneDrive or Dropbox.
  • Files. Opens Markdown, text, code, Word and PDF. Saves Markdown and never overwrites a file changed
    elsewhere. Exports Word, PDF, an offline web page with the source inside, HTML and text.
  • Privacy. Everything runs on the device. No analytics, no cookies. Remote pictures load only when you allow
    them. Browsers can clear stored notes: back up from Notes settings → BACKUP.

For agents

The agent and the person share one page. The agent reads only the passages it needs and changes exactly what it
read; the person's typing comes first, and an agent's change undoes on its own. The Will marks what an agent may
edit, only add to, or must leave alone (Will/1). llms.txt,
AGENT-TOOLS.json, the agent guide and the skills say the
rest.

claude plugin marketplace add jackskip22/rapier-plugins && claude plugin install rapier@rapier
npx rapier-html notes.md                         # one offline page: the editor with the document inside
npx rapier-html proposal.md --base original.md   # opened on the diff of a proposed change
npm install rapier-markdown-kit                  # read, write and style the Markdown without the editor (MIT)

In ChatGPT, add the MCP address in developer mode
(OpenAI's guide). A hosted workspace expires after
about thirty idle days. Data handling: rapier.website/privacy.

In your own app

npm install rapier-embed mounts the document editor in your page. Your app owns the document, the storage and the
revisions.

import {Rapier} from 'rapier-embed';
const editor = Rapier.mount(document.querySelector('#editor'), {
  sessionId, documentId,
  load: {content, filename: 'notes.md', revision},
  save: ({requestId, content, baseRevision}) => store.writeOnce({documentId, requestId, content, baseRevision}),
});

save returns {revision} once storage confirms the bytes, or throws Rapier.conflict(currentRevision). Pin a
version at https://rapier.website/embed/<version>/rapier-document.html. The
embed contract and the embed skill have the rest.

Markdown

Rapier writes CommonMark plus conventions other editors already read, with pictures inside the file:
the standard, what other readers show,
adopting it.

Source and self-hosting

src/ is the complete source of rapier.html; (cd src && node tools/build.mjs) rebuilds it byte for byte
(build.json). npx wrangler deploy serves it with the included configuration.
(cd src && RAPIER_PROFILE=document node tools/build.mjs) builds the smaller document editor without Notes, Draw and Paint.

Run node --test src/tools/test-public.mjs with Node 22 to check concurrent source edits and Undo, authored HTML
control boundaries, and hostile SVG filtering with drawing-data preservation. The tests need no browser, account,
package install or network connection. The same checks run on every push and pull request in GitHub Actions.

Licence and contributing

AGPL-3.0-only with the stated terms; the reusable modules are MIT; a commercial licence is
available (LICENSING.md). Issues and pull requests are welcome: CONTRIBUTING.md, SECURITY.md.

Related: rapier-plugins (the plugins and npm packages),
rapier-jxl (the JPEG XL encoder), will
(the Will standard).

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