io.github.jackskip22/rapier (MCP Server)

The MCP server provides a markdown editor delivered as a single offline HTML file. It supports an editing workflow where an agent edits passages, and the user can choose to keep or drop each change. The description centers on editing markdown content entirely offline within that standalone HTML page.

🛠️ Key Features

Markdown editing in one offline HTML file
Agent-driven passage edits
Per-change selection to keep or drop modifications

🚀 Use Cases

Offline markdown editing without external services
Review-and-accept workflows for passage-level edits
Keeping changes selectively during agent-assisted editing

⚡ Developer Benefits

Simple deployment as a single self-contained HTML artifact
Clear user control over each proposed edit

⚠️ Limitations

Limited to the functionality described: editing passages and selecting keep/drop for each change
No additional tool counts or capabilities were provided in the available source data

Rapier - Markdown Editor & Art: plugins and packages

Plugins, npm packages and plug-in files for Rapier - Markdown Editor & Art. Markdown editor for writing, notes, editable diagrams, drawing and painting with your AI assistant. Work together through a supported host, deliver an editable offline file, or embed the editor or reader in your app.

Start

Work live with a person. Connect an MCP client to https://mcp.rapier.website/door/mcp over streamable HTTP, then call open. Open the returned editor_url for the person. Read rapier://guide for editing, drawing, painting, comments, review and export. No account or key is required.
Hand over an offline document. npx rapier-html notes.md writes notes.rapier.html: the editor and its document in one file. Package.
Put Rapier in your app. npm install rapier-embed embeds the editor or the lightweight reader. Enable agent: true on the editor for your app's own agent over WebMCP. Your app owns storage; the reader is read-only. Embedding.
Keep rich documents in Markdown. npm install rapier-markdown-kit reads and writes pictures, editable drawings and layout in one .md file. Respect Will/1 regions: edit, append and keep. Self-contained Markdown.
Encode JPEG XL in JavaScript. npm install rapier-jxl adds the encoder that Rapier uses, in browsers, Node.js and other JavaScript runtimes. Encoder.
Run your own door. rapier-server serves Markdown from your folder or S3-compatible bucket through the same MCP tools. Supply Node.js and Chromium; start with rapier-server serve <folder> and the documented browser settings.

The agent edits live, beside the person or while they are away. Rapier shows its presence and changes; the person taps a change to see what was there before and undoes anything, keeping later edits. Use show {target:"comparison"} to deliberately show a diff. Read exact source before editing, and preserve the person's typing and Will. The agent guide lists the tools and their inputs.

Agent plugins

The repository root is an Agent Plugins package: plugin.json, mcp.json and skills/ supply four skills and the MCP door. Install this root with a client that supports Agent Plugins 1.0. Antigravity reads the same root and mcp_config.json: agy plugin install https://github.com/jackskip22/rapier-plugins
The four skills alone, for any agent the skills command supports: npx skills add jackskip22/rapier-plugins
cursor/: the Cursor plugin adds a rule for writing, diagrams, comparisons and paintings in an editable document. The Cursor marketplace at .cursor-plugin/marketplace.json points to it. Local installation. Install one Rapier package in each client.
claude/: the Claude plugin: four skills and the MCP door. claude plugin marketplace add jackskip22/rapier-plugins && claude plugin install rapier@rapier
openai/: the OpenAI package: its separately retained skills and remote MCP endpoint.
The door, https://mcp.rapier.website/door/mcp, is in the MCP registry as io.github.jackskip22/rapier (server.json). Any MCP client connects to it with no account or key.

npm packages

npm/rapier-html/: npx rapier-html@1.2.11 notes.md writes one offline HTML file: the editor with the document inside.
npm/rapier-embed/: npm install rapier-embed@1.2.11 puts the read-only reader or the document editor in your site or app, saving to your own storage (MIT).
npm/rapier-markdown-kit/: read, write and render Self-contained Markdown, one .md file with its pictures and layout, without the editor (MIT).
The JPEG XL encoder inside Rapier is rapier-jxl, published from jackskip22/rapier-jxl.

Plug-in files

Rapier pages download these the first time a document needs them, through https://cdn.jsdelivr.net/gh/jackskip22/rapier-plugins@v1.2.11/<directory>/<file> (each release's own tag), and verify each by length and SHA-384. To keep the reader's plug-ins in your own app, run npx rapier-embed@1.2.11 plugins <directory>; see Plug-ins.

math/: The pinned app Math renderer, its complete notices and original input identities.
letters/: Draw's letter sets, ornamental capitals traced from the British Library's book scans (CC0).
templates/ and elements/: Starters' page borders and the Elements sheet's ornaments, traced from the ornament book (CC0), a file each.
flowchart/, docx/, pdf/: the reader's own plug-ins, a file each: the flowchart renderer, the Word reader and the PDF reader's page reading.
sources/reader-1.2.11/: the source of those three plug-ins, which builds them offline (its README.reader-plugins.md).

Source: github.com/jackskip22/rapier. Privacy and terms.

document	string	required	The MCP document capability from rapier.open. Keep it private and pass it to later calls.
operation_id	string	required	A fresh random id for this call (a UUID works). Resend it only to retry this call; the retry replays the recorded result.
expectedRevision	integer	required	The documentRevision from current context.
scope	string	optional	The rendered area to inspect; viewport by default.
agent	string	optional	This assistant's display name.

document	string	required	The MCP document capability from rapier.open. Keep it private and pass it to later calls.
operation_id	string	required	A fresh random id for this call (a UUID works). Resend it only to retry this call; the retry replays the recorded result.
status	string	optional
thread_id	string	optional
cursor	string	optional	Continues the previous page.
agent	string	optional	This assistant's display name.

document	string	required	The MCP document capability from rapier.open. Keep it private and pass it to later calls.
operation_id	string	required	A fresh random id for this call (a UUID works). Resend it only to retry this call; the retry replays the recorded result.
editorKey	string	optional	The editor key from the Apps UI resource, held by the host and editor alone.
action	string	required
thread_id	string	optional
text	string	optional
context_handle	string	optional
anchor	string	optional
object_id	string	optional
recipient	string	optional
agent	string	optional	This assistant's display name.

document	string	required	The MCP document capability from rapier.open. Keep it private and pass it to later calls.
operation_id	string	required	A fresh random id for this call (a UUID works). Resend it only to retry this call; the retry replays the recorded result.
agent	string	optional	This assistant's display name.

document	string	required	The MCP document capability from rapier.open. Keep it private and pass it to later calls.
operation_id	string	required	A fresh random id for this call (a UUID works). Resend it only to retry this call; the retry replays the recorded result.
within	string	optional	An outline ref to stay inside.
cursor	string	optional	Continues the previous page.
limit	integer	optional	Items per page.
agent	string	optional	This assistant's display name.

io.github.jackskip22/rapier (MCP Server)

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

document.inspect_visual

document.list_comments

document.comment

document.get_context

document.get_outline

document.read_context

document.find

document.apply_edits

document.propose_edits

document.undo_agent_change

document.show_changes

document.compare

document.open_text

document.reveal

document.create_return

document.wait_for_user

document.save

document.draw

notes.list

notes.read

rapier.guide

rapier.open

document.sync

document.commit

document.compare_decide

document.human_context

document.set_policy

document.review_decide

document.visual_ack

document.view_ack

document.rotate_capability

document.delete

Rapier - Markdown Editor & Art: plugins and packages

Start

Agent plugins

npm packages

Plug-in files

Install

Remote endpoint

Related servers