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MarkLayer MCP Server

local only

MarkLayer runs on your own machine — the client starts it, so there is no endpoint to ping. 667 installs a week from npm. Last commit 7 Nov 2026.

Work visual annotations on a live webpage: watch, acknowledge, resolve, reply, or leave your own.

Installs per day peak 82 · avg 20 · +47% w/w
a month agotoday
667
Installs / week
npm · marklayer-mcp
47
Stars
0 open issues
7 Nov 2026
Last commit
7 releases in 90 days
MIT
License
TypeScript

What the code does

We read the source, 1 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a database query by concatenation apps/extension/components/GuideLayer.tsx:227
      Click to drop · Shift+click for vertical · Drag a guide to move · Backspace to delete · ⌘Z to undo
Long encoded blob in source apps/worker/src/og-fonts.ts:8
  'AAEAAAAPAIAAAwBwR0RFRgWBClAAAEDYAAAAfEdQT1Oyt2+DAABBVAAAJBBHU1VCQgcpSgAAZWQAAAMWT1MvMlR2A9oAAAF4AAAAYFNUQVTni8s4AABofAAAAEhjbWFwipQu+wAABdQAAAHUZ2FzcAAAABAAAEDQAAAACGdseWa0e6PSAAAJqAAANTRoZWFkO9bOzwAAAPwAAAA2aGhlYQxKCqsAAAE0AAAAJGhtdHgCRy2jAAAB2AAAA/xsb2NhRvJT/QAAB6gAAAIAbWF4c…

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add marklayer -- npx -y marklayer-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "marklayer": {
      "command": "npx",
      "args": [
        "-y",
        "marklayer-mcp"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.marklayer]
command = "npx"
args = ["-y", "marklayer-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "marklayer": {
      "command": "npx",
      "args": [
        "-y",
        "marklayer-mcp"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "marklayer": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "marklayer-mcp"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: MARKLAYER_ROOM (Same as --room: the share URL or room id to join at startup), MARKLAYER_API_BASE (Override the MarkLayer worker base URL. Defaults to https://marklayer.app; useful against a local dev worker), MARKLAYER_AGENT (Name shown to the humans in the room for this agent. Defaults to claude-code).

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MarkLayer — questions

Answers built from our own checks of this server.

Why is there no uptime for MarkLayer?
MarkLayer runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package marklayer-mcp was installed 667 times last week.
How do I connect MarkLayer?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls marklayer-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use MarkLayer?
The npm package marklayer-mcp was installed 667 times in the last week. Week over week that is +47%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is MarkLayer open source?
Yes — it is published under the MIT licence, written in TypeScript and 47 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.