AI Plugin Index
Critical
Verified · npm:criticalMCP server by addyosmani · updated · ★ 10k · 13k downloads a week
Extract & inline critical-path CSS — two engines, automatic routing, agent-native. Critical is published by npm:critical from its verified domain in the official MCP Registry.
Last commit 7 days ago
Apache-2.0: permissive, fine for commercial use
Clear description, published package or server URL, 10,293 stars, original repository
Not checked yet. What we check
Install Critical
Built from the published package, never by AIclaude mcp add critical -- npx -y criticalRun in your terminal. Add --scope user to use it in every project.
{
"mcpServers": {
"critical": {
"command": "npx",
"args": [
"-y",
"critical"
]
}
}
}Settings, Developer, Edit config. Paste into claude_desktop_config.json and restart.
{
"mcpServers": {
"critical": {
"command": "npx",
"args": [
"-y",
"critical"
]
}
}
}Add to ~/.cursor/mcp.json (all projects) or .cursor/mcp.json (this project).
{
"servers": {
"critical": {
"command": "npx",
"args": [
"-y",
"critical"
]
}
}
}Add to .vscode/mcp.json. VS Code uses "servers", not "mcpServers".
codex mcp add critical -- npx -y critical{
"mcpServers": {
"critical": {
"command": "npx",
"args": [
"-y",
"critical"
]
}
}
}Add to ~/.gemini/config/mcp_config.json (all projects) or .agents/mcp_config.json (this project).
gemini mcp add critical npx -y criticalGemini CLI was replaced by Antigravity CLI in June 2026 and remains only for enterprise licences and paid API keys.
MCP servers run with your permissions and can read what you give them access to. Some need an API key: check the README and add it under env in the critical block.
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Critical: common questions
How do I install Critical?
In Claude Code run claude mcp add critical -- npx -y critical. For Claude Desktop, Cursor and VS Code, paste the config shown above and restart. See the install guides.
Is Critical the official server?
Critical is published by npm:critical from its verified domain in the official MCP Registry.
Is Critical free?
The code is published under the Apache-2.0 licence. The service it connects to may have its own pricing.
Is Critical safe to use?
It scores 94 of 100. Grades: maintenance A, licence A, quality A. The security check has not run for it yet. Review the code before you install. How grades work.
What are alternatives to Critical?
Similar MCP servers: GitDiagram, draw.io, Pascal App CLI, Figma-Context-MCP.
Does Critical work with ChatGPT?
Not directly. It runs locally, and ChatGPT only connects to remote servers with a URL. Use it in Claude Code, Claude Desktop, Cursor, VS Code or Codex.