Siren MCP Server

Mermaid-compatible syntax. Draw.io-quality output. Siren is an open-source diagramming tool that lets you write diagrams as text and renders them with beautiful, polished visuals - think Mermaid's simplicity with draw.io's aesthetics. It runs locally over stdio via the published package.

People connecting this server to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-11 · ★ 2 · #488 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

MIT · TypeScript servers · how we verify → /methodology

01 · Install Siren

Claude Code

claude mcp add yoavhizkih-siren -- npx -y siren-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "yoavhizkih-siren": {
      "command": "npx",
      "args": [
        "-y",
        "siren-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

repo age created 2026-07-15 - young repo, little track record yet

license MIT - declared in the repository

npm package siren-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.yoavhizkiH is GitHub-verified and matches the repo owner

03 · Who maintains Siren

siren is maintained by yoavhizkih. It's the only MCP server we track from this author; the repo dates to Jul 2026.

04 · Facts

repository
github.com/yoavhizkih/siren
category
other - ranked #488 of 848 actively-maintained other servers as of 2026-08-25.
registry
io.github.yoavhizkiH/siren (active, first published 2026-07-19)
packages
npm:siren-mcp

05 · Siren FAQ

What is Siren?

Mermaid-compatible syntax. Draw.io-quality output. Siren is an open-source diagramming tool that lets you write diagrams as text and renders them with beautiful, polished visuals - think Mermaid's simplicity with draw.io's aesthetics. It runs locally over stdio via the published package.

Is Siren still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-11. We re-verify nightly.

How do I install Siren?

Run `npx -y siren-mcp`. You can also paste the ready-made client config above.

Does Siren run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

06 · Alternatives to Siren

Alternatives to Siren

Maintained other servers if Siren isn't the fit.

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  5. Microsoft Fabric MCP Server MCP tools for interacting with Microsoft Fabric ★ 3,598 · 2026-08-21
  6. Ship Swift 40+ production-ready SwiftUI recipes for building full-stack iOS apps via MCP. ★ 2,968 · 2026-08-09

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