MermAId
esbuild · by mozi-app
AI-agent-focused Mermaid editor for planning, with built-in MCP server and CLI tool
No known CVEs
Apache-2.0 license
Actively maintained
Last commit 15d ago
Works with most clients
Transport: stdio, sse
2 tools · ~109 tok
Grade A · 0.1% of 200K ctx
MCPpedia last refreshed this data
This server has been archived and is no longer actively maintained.
MermAId is an MCP server that AI-agent-focused Mermaid editor for planning, with built-in MCP server and CLI tool. Its tool list has not been published yet over stdio and sse, requires no API key, and scores 74/100 on MCPpedia's security, maintenance and efficiency rubric.
Step 1
Install in your client
Config is the same across clients — only the file and path differ.
CD
Supported in Claude Desktopstdio, sse · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"mermaid-editor": {
"args": [
"--mcp"
],
"command": "/path/to/mermaid-editor"
}
}
}Are you the author?
Add this badge to your README to show your security score and help users find safe servers.
Embed in your READMEAbout badges →
[](https://mcppedia.org/s/mermaid)
Read me
What MermAId does
A local Mermaid diagram editor designed for AI-assisted workflows. It's a pretty nice live Mermaid editor. But it's also a tool to be used with AI coding agents in generating plans. An AI coding agent (Claude Code, Codex, etc.) generates or updates diagrams via MCP or CLI, and you see the results rendered live in your browser. You can also edit diagrams directly — it's a full editor with syntax highlighting, linting, and vim keybindings. Push changes back to the agent, iterate, rinse and repeat.
Test This Server
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y 'esbuild' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
Scored, not listed
Why this score
Five weighted categories — click any category to see the underlying evidence.
Score breakdown
74/100across 5 weighted dimensions
0255075100
29
20
15
10
−26
Security
Maintenance
Efficiency
Documentation
Compatibility
Categoriesclick a row to see evidence
Security
OSV.dev3 fixed
GHSA-gv7w-rqvm-qjhrhigh · fixedCVSS 8.1
esbuild: Missing binary integrity verification in Deno module enables remote code execution via NPM_CONFIG_REGISTRY
### Summary The esbuild Deno module (`lib/deno/mod.ts`) downloads native binary executables from an npm registry and writes them to disk with executable permissions (`0o755`) **without performing any integrity verification** (e.g., SHA-256 hash check). The Node.js equivalent (`lib/npm/node-install.ts`) includes a robust `binaryIntegrityCheck()` function that verifies SHA-256 hashes against hardcoded expected values from `package.json`, but this protection was never implemented for the Deno dist
GHSA-g7r4-m6w7-qqqrlow · fixedCVSS 2.5
esbuild allows arbitrary file read when running the development server on Windows
### Summary The development server contains a path traversal vulnerability on Windows when serving files from `servedir`. Due to the use of `path.Clean()` (which only normalizes forward-slash `/` separators) instead of a Windows-aware path normalization function, it is possible to craft requests using backslashes (`\`) that bypass the intended directory containment logic. An attacker can escape the configured `servedir` root and access arbitrary files on the filesystem. This issue affects Wind
GHSA-67mh-4wv8-2f99medium · fixedCVSS 5.3
esbuild enables any website to send any requests to the development server and read the response
### Summary esbuild allows any websites to send any request to the development server and read the response due to default CORS settings. ### Details esbuild sets `Access-Control-Allow-Origin: *` header to all requests, including the SSE connection, which allows any websites to send any request to the development server and read the response. https://github.com/evanw/esbuild/blob/df815ac27b84f8b34374c9182a93c94718f8a630/pkg/api/serve_other.go#L121 https://github.com/evanw/esbuild/blob/df815a
Inventory
Tools (2)
Click any tool to inspect its schema.
~109 tokens total
Community
Reviews
Be the first to review
Have you used this server?
Share your experience — it helps other developers decide.
How easy was setup?Did it work reliably?How was the documentation?
Sign in to write a review.
Frequently Asked Questions
- Is MermAId safe to use?
- MermAId has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments. Licensed under Apache-2.0.
- How do I install MermAId?
- MermAId supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What can MermAId do?
- MermAId provides 2 tools: get_diagram, set_diagram. See the full tools list on the server page for descriptions and parameters.
- What AI clients work with MermAId?
- MermAId is compatible with claude-desktop, cursor, claude-code. It uses stdio and sse transport.
- Is MermAId actively maintained?
- MermAId is actively maintained — last commit was 15 days ago. It has 12 GitHub stars.
Related
Similar servers
Others in developer-tools
Context797Context7 Platform -- Up-to-date code documentation for LLMs and AI code editors
61.2k 2
G
Mcp Gitlab96MCP server for using the GitLab API
1.9k 12
Supabase MCP Server96Manage Supabase projects — databases, auth, storage, and edge functions
2.9k 4
Chrome Devtools Mcp96Chrome DevTools for coding agents
49.7k 10
MCP Security Weekly
Get CVE alerts and security updates for MermAId and similar servers.
Community
Discussion
Start a conversation
Ask a question, share a tip, or report an issue.
Has anyone used this with Cursor?How do you handle auth?Any alternatives?
Sign in to join the discussion.