Rapier

jackskip2214stars

1# Rapier

README.mdMCP server

Transport: stdio
Status: Local

Power your agent

Add this server

Install from the publisher. Not a PlugMCP endpoint.

Run on PlugMCP

Host a copy with our keys and logs.

No packaged release in the registry yet. Follow the repository README.

RepositoryPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
License: AGPL-3.0
Last checked: 2026-10-27

Stars: 14
Tools: —
Uptime: —

Overview

About Rapier

Fast Markdown editor for notes, diagrams, drawing & watercolor painting in a single HTML file. Web, Android (Play Store), Windows & Linux. Phone-first, works anywhere, offline. Optional sync to your own Cloudflare account for free. Collaborate with AI agents over MCP & WebMCP. Embeddable editor and lightweight Markdown reader build ~300kB

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

How do I install Rapier?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Rapier need an API key?

No required environment variable is listed on this record.

What transport does Rapier use?

Rapier runs locally over stdio.

When was Rapier last checked?

Last checked 2026-10-27. Fast Markdown editor for notes, diagrams, drawing & watercolor painting in a single HTML file. Web, Android (Play Store), Windows & Linux. Phone-first, works anywhere, offline. Optional sync to your own Cloudflare account for free. Collaborate with AI agents over MCP & WebMCP. Embeddable editor and lightweight Markdown reader build ~300kB

From the publisher

Documentation

Rapier - Markdown Editor & Art

A Markdown editor you write, draw and paint in, alone or with your AI assistant. Made for your phone; works in any browser. Text and pictures stay in one Markdown file. Free and offline, with no ads, tracking or account.

On the web: rapier.website. Add it to your home screen to use it offline.
As a file: rapier.html, or the read-only rapier-reader.html. Open it in a browser.
On Android: Google Play. The app has no Internet permission.
On Windows (beta): Rapier.exe (version 1.2.30), the whole app in one file. If SmartScreen warns, choose More info, then Run anyway.
On Linux (x86_64, beta): rapier-linux (version 1.2.39). Run chmod +x rapier-linux && ./rapier-linux --install once; it opens as an app window in your Chromium-based browser. Requirements.
With an agent: the Claude plugin, Grok Bot or another MCP client at https://mcp.rapier.website/door/mcp; ChatGPT at https://mcp.rapier.website/openai/mcp.

What it does

Write. Edit the page or the Markdown source; text you don't touch stays byte for byte. Tables, checklists, footnotes, LaTeX, Mermaid, comments, compare, read aloud and right-to-left.
Pictures. Stored inside the .md file as JPEG XL from Rapier's own encoder.
Draw. Editable SVG: pen, brush, shapes, attached arrows and text.
Paint. Oil, pencil, marker and MyPaint brushes. Watercolor mixes, flows and dries on textured paper.
Notes. One Markdown file per note, with pins, checklists, voice recordings, history and search that reads text in pictures. Import from Google Keep, Apple Notes, Evernote, Notion, Obsidian and Joplin. Sync plain files to your own cloud storage.
Files. Open Markdown, text, code, Word and PDF. Export Word, PDF or an offline HTML page. Rapier never overwrites a file that changed elsewhere.
Privacy. Editing and Notes run on your device, with no analytics. Agent workspaces use hosted storage.

For agents

Work together live. Connect to https://mcp.rapier.website/door/mcp, then call open to share one document with the person.
Hand over an offline editor. npx rapier-html notes.md writes the editor and the document as one HTML file.
Embed the editor. rapier-embed mounts the editor or reader in your app; your app's agent uses it over WebMCP.
Keep portable Markdown. rapier-markdown-kit reads, writes and renders the file without the editor. Respect Will/1 regions.
Host the door yourself. rapier-server serves your own folder or S3-compatible bucket.

The person sees each change, taps it to see what was there and can undo it while keeping later edits. Their typing comes first. Read the agent guide, llms.txt, AGENT-TOOLS.json and the skills.

claude plugin marketplace add jackskip22/rapier-plugins && claude plugin install rapier@rapier
npx rapier-html revised.md --compare original.md   # the edit beside its original

Current MCP clients connect at https://mcp.rapier.website/door/mcp with no account; in ChatGPT, add the OpenAI connector at https://mcp.rapier.website/openai/mcp in developer mode (OpenAI's guide). Hosted workspaces expire after 30 idle days; export keeps a copy. Privacy.

In your own app

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}),
});

Your app owns the document, storage and revisions. save returns {revision} once storage confirms the bytes, or throws Rapier.conflict(currentRevision). Use build: 'reader' for the read-only reader. See the embed skill and the embed contract.

Markdown

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

Build

src/ is the complete source of rapier.html.

(cd src && node tools/build.mjs) rebuilds it byte for byte (build.json).
(cd src && RAPIER_PROFILE=reader node tools/build.mjs) builds the reader.
npx wrangler deploy serves it with the included configuration.

License

AGPL-3.0-only with the stated terms. The reusable modules are MIT. A commercial license is available (LICENSING.md). Issues and pull requests are welcome: see CONTRIBUTING.md and SECURITY.md.

Related: rapier-plugins, rapier-jxl and will.

Rapier

jackskip2214stars

Cloud Infrastructure Mobile Development Productivity

Install Run on PlugMCP

GitHub Website

Run on PlugMCP

1# Rapier

README.mdMCP server

Transport: stdio
Status: Local

Power your agent

Add this server

Install from the publisher. Not a PlugMCP endpoint.

Run on PlugMCP

Host a copy with our keys and logs.

No packaged release in the registry yet. Follow the repository README.

RepositoryPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
License: AGPL-3.0
Last checked: 2026-10-27

Stars: 14
Tools: —
Uptime: —

Overview

About Rapier

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

How do I install Rapier?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does Rapier need an API key?

No required environment variable is listed on this record.

What transport does Rapier use?

Rapier runs locally over stdio.

When was Rapier last checked?

From the publisher

Documentation

Rapier - Markdown Editor & Art

On the web: rapier.website. Add it to your home screen to use it offline.
As a file: rapier.html, or the read-only rapier-reader.html. Open it in a browser.
On Android: Google Play. The app has no Internet permission.
On Windows (beta): Rapier.exe (version 1.2.30), the whole app in one file. If SmartScreen warns, choose More info, then Run anyway.
On Linux (x86_64, beta): rapier-linux (version 1.2.39). Run chmod +x rapier-linux && ./rapier-linux --install once; it opens as an app window in your Chromium-based browser. Requirements.
With an agent: the Claude plugin, Grok Bot or another MCP client at https://mcp.rapier.website/door/mcp; ChatGPT at https://mcp.rapier.website/openai/mcp.

What it does

Write. Edit the page or the Markdown source; text you don't touch stays byte for byte. Tables, checklists, footnotes, LaTeX, Mermaid, comments, compare, read aloud and right-to-left.
Pictures. Stored inside the .md file as JPEG XL from Rapier's own encoder.
Draw. Editable SVG: pen, brush, shapes, attached arrows and text.
Paint. Oil, pencil, marker and MyPaint brushes. Watercolor mixes, flows and dries on textured paper.
Notes. One Markdown file per note, with pins, checklists, voice recordings, history and search that reads text in pictures. Import from Google Keep, Apple Notes, Evernote, Notion, Obsidian and Joplin. Sync plain files to your own cloud storage.
Files. Open Markdown, text, code, Word and PDF. Export Word, PDF or an offline HTML page. Rapier never overwrites a file that changed elsewhere.
Privacy. Editing and Notes run on your device, with no analytics. Agent workspaces use hosted storage.

For agents

Work together live. Connect to https://mcp.rapier.website/door/mcp, then call open to share one document with the person.
Hand over an offline editor. npx rapier-html notes.md writes the editor and the document as one HTML file.
Embed the editor. rapier-embed mounts the editor or reader in your app; your app's agent uses it over WebMCP.
Keep portable Markdown. rapier-markdown-kit reads, writes and renders the file without the editor. Respect Will/1 regions.
Host the door yourself. rapier-server serves your own folder or S3-compatible bucket.

The person sees each change, taps it to see what was there and can undo it while keeping later edits. Their typing comes first. Read the agent guide, llms.txt, AGENT-TOOLS.json and the skills.

claude plugin marketplace add jackskip22/rapier-plugins && claude plugin install rapier@rapier
npx rapier-html revised.md --compare original.md   # the edit beside its original

In your own app

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}),
});

Markdown

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

Build

src/ is the complete source of rapier.html.

(cd src && node tools/build.mjs) rebuilds it byte for byte (build.json).
(cd src && RAPIER_PROFILE=reader node tools/build.mjs) builds the reader.
npx wrangler deploy serves it with the included configuration.

License

AGPL-3.0-only with the stated terms. The reusable modules are MIT. A commercial license is available (LICENSING.md). Issues and pull requests are welcome: see CONTRIBUTING.md and SECURITY.md.

Related: rapier-plugins, rapier-jxl and will.