Open Pencil MCP Server

Model Context Protocol server for [OpenPencil](https://openpencil.dev). It lets MCP clients such as Claude Code, Cursor, and Windsurf inspect and edit designs through the running app, reusing the same tool definitions as the built-in AI chat.

9.1kNode.jsstdio

context tax

pending

security

100/100

cold start

pending

freshness

Activetoday

Our reading of Open Pencil, from the data

Open Pencil is a ai & llm tools MCP server from open-pencil.

We haven't measured its tool list yet, so its token cost is unknown.

Maintenance is active: the last public signal was in the last day (2026-10-19). For comparison, 59% of ai & llm tools servers are active or maintained.

With 9,107 GitHub stars it ranks #12 of 3,169 ai & llm tools servers we index.

It runs locally on your machine over stdio.

Install Open Pencil MCP server

claude mcp add open-pencil -- npx -y @open-pencil/mcp

{
  "mcpServers": {
    "open-pencil": {
      "command": "npx",
      "args": [
        "-y",
        "@open-pencil/mcp"
      ]
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "open-pencil": {
      "command": "npx",
      "args": [
        "-y",
        "@open-pencil/mcp"
      ]
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "open-pencil": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@open-pencil/mcp"
      ]
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "open-pencil": {
      "command": "npx",
      "args": [
        "-y",
        "@open-pencil/mcp"
      ]
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Security signals

100/100 — no known issues found as of 2026-10-19, from the checks below. This is not a guarantee of safety; review what a server can do before connecting it.

Deductions

No findings from the checks that ran.

Checks

✓Repository hygiene (archived, activity, license, security policy)
○Package metadata (install scripts, provenance) — pending
○Tool descriptions (prompt-injection and hidden-text heuristics) — pending
○Source scan (secrets, CVEs, risky code) by vectra-guard — pending

Scan it yourself before installing with vectra-guard, the open-source agent security CLI. Scoring rules

Freshness

Active — last maintenance signal today. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-19 · today · GitHub
Latest release
2026-10-14 · 4d ago · GitHub · v0.16.0
Package published
no data · npm/PyPI
Registry entry updated
no data · official registry

How it compares in AI & LLM Tools

Against the most-starred ai & llm tools servers we index. Token cost is per model turn, measured from each server's live tool list.

Server	Stars	Tools	Tokens / turn	Freshness	Runs
Open Pencil (this)	9,107	—	not measured	Active	local
Memory	91,356	—	not measured	Active	local
Claude Flow	76,638	—	not measured	Active	local
Next AI Draw.io	36,318	—	not measured	Active	local
Serena Agent	30,371	—	not measured	Active	local
Trycua	30,160	—	not measured	Active	—

All ai & llm tools MCP servers

FAQ

›How do I install the Open Pencil MCP server in Claude Code?

Run: claude mcp add open-pencil -- npx -y @open-pencil/mcp. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Open Pencil require an API key?

No required environment variables are declared in its published metadata.

›Can I use Open Pencil as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Open Pencil in the official MCP registry?

No. It was indexed from npm.

Sources and method

GitHub repository: fetched 2026-10-19
Package registry (npm / PyPI): listed
Security signals, computed by us: 2026-10-19
Last checked against all sources: 2026-10-19

The description, packages and links come from the maintainer's own published metadata. Token cost, security signals, freshness and the reading above are MCPSkillHub's own measurements; see the methodology. Spot an error? Request a correction or claim the listing.