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Siren MCP server

by yoavhizkiH·io.github.yoavhizkiH/siren·v0.1.0·2 stars
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MCP server for Siren diagramming — teach AI models to create beautiful diagrams with Siren syntax

A88/100grade A
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Safety scan
A88/100

full report

Adoption
New

2 stars21 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

Siren tools (2)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • siren_url

    Generate a shareable URL that opens a Siren diagram in the browser editor.

  • siren_validate

    Validate Siren diagram syntax. Returns a success confirmation or a list of errors.

Public scan report

scanner v0.1.9 · 2026-09-25 · same rubric, same numbers if you re-run it

no findings
  • Code scan7 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitylocal package, no credentials required12/15
  • Maintenancelast push 45 days ago12/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 88/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Siren compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
88/100
higher than 75% of 48,255 servers
Tools
2
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
GitHub stars
2
more than 75% of 28,688 servers
Downloads a week
21
more than 8% of 12,191 servers with a package

What its tools let an agent do: 2 read

Install Siren in Claude Code, Cursor or VS Code

Runs npx -y siren-mcp on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add siren -- npx -y siren-mcp
Add to Cursor

What the publisher says

From the Siren repository's README, as published. We do not edit it. Read it on GitHub

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.

Examples

Flowchart

Architecture diagram

Sequence diagram

CI/CD pipeline

Features

  • Flowcharts — graph TD / graph LR with full node shape support
  • Architecture diagrams — annotate nodes with @icon to get automatic Material UI icons and tier-based color coding
  • Sequence diagrams — sequenceDiagram with all Mermaid arrow types, forward/return color distinction
  • Mermaid-compatible syntax — paste your existing Mermaid diagrams and they just work
  • Live preview — edits render instantly in the browser

Supported shapes

[Rectangle]   (Rounded)   {Diamond}   ((Circle))   [(Cylinder)]
([Stadium])

Icon annotations

Append @icontype to any node ID to apply an icon and automatic color tier:

Browser@user([Browser])
DB@database[(PostgreSQL)]
Cache@cache((Redis))

Available icons: user browser mobile cloud server database cache storage queue gateway shield firewall container function monitor

Quick start

git clone https://github.com/your-org/siren.git
cd siren
npm install
npm run dev

Open http://localhost:5173.

Arrow types (sequence diagrams)

Tech stack

  • React + TypeScript
  • Vite
  • dagre for flowchart layout
  • MUI icons for node icons
  • Pure SVG rendering — no canvas, no D3

Contributing

Pull requests are welcome. For major changes, open an issue first.

License

MIT — see LICENSE.

Nothing above is checked by us. What we check is on the safety report.

Siren: common questions

Is Siren MCP server safe?
Yes, by our scan: it is graded A (88/100). Read the Siren safety report
How do I install Siren?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does Siren need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Siren maintained?
The last commit was 85 days ago (2026-08-11). The latest release is v0.1.0.
How does Siren compare with other MCP servers?
safety score 88/100 (higher than 75% of 48,255 servers); tools 2 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.