What is mermaid-mcp?
mermaid-mcp is a MCP server by Narasimhaponnada that mermaid diagram generation (flowcharts, sequence, class, ER, architecture and state diagrams) with templates, layout engines and SVG/PNG/PDF export. It is listed under Media & design and has 53 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | Narasimhaponnada |
| Repository | Narasimhaponnada/mermaid-mcp |
| Popularity | 53 GitHub stars |
| Category | Media & design |
| Security | Low risk (84/100) |
| Rank | #837 of 4,418 MCP servers; #56 in Media & design |
| Last commit | 2025-11-05 |
| Runs | Cloud service |
| Language | TypeScript |
| Platforms | macOS, Windows, Linux |
Is mermaid-mcp safe to install?
mermaid-mcp scores 84/100 on the MCPMods security check: Low risk. Things to review: sends your data to a cloud service. It passed 4 of 6 checks.
MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.
| Check | Result |
|---|---|
| Community-built server | Note |
| Sends your data to a cloud service | Review |
| No credentials mentioned | Pass |
| Read-only by description | Pass |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install mermaid-mcp?
- Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
https://github.com/Narasimhaponnada/mermaid-mcp
- Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
claude mcp add mermaid-mcp -- <command from README> claude mcp add --transport http mermaid-mcp <server-url>
- Check it connected. This lists your MCP servers and their status.
claude mcp list
Or ask Claude to set it up
Paste this into Claude Code and it installs mermaid-mcp for you:
Add the "mermaid-mcp" MCP server from https://github.com/Narasimhaponnada/mermaid-mcp to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.