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Environment variable

export BYUL_API_KEY=byul_api_key
Never hardcode API keys. Use environment variables instead.

​
Cursor

~/.cursor/mcp.json or project .cursor/mcp.json: 
{
  "mcpServers": {
    "byul": {
      "command": "npx",
      "args": ["-y", "@byul/mcp"],
      "env": { "BYUL_API_KEY": "byul_api_key" }
    }
  }
}

​
Claude Code (VS Code extension)

CLI: 
claude mcp add -e BYUL_API_KEY=byul_api_key --scope user byul npx -- -y @byul/mcp
Settings JSON: 
{
  "mcpServers": {
    "byul": {
      "command": "npx",
      "args": ["-y", "@byul/mcp"],
      "env": { "BYUL_API_KEY": "byul_api_key" }
    }
  }
}

​
Claude Desktop

claude_desktop_config.json: 
{
  "mcpServers": {
    "byul": {
      "command": "npx",
      "args": ["-y", "@byul/mcp"],
      "env": { "BYUL_API_KEY": "byul_api_key" }
    }
  }
}

​
VS Code

Workspace .vscode/mcp.json: 
{
  "mcpServers": {
    "byul": {
      "command": "npx",
      "args": ["-y", "@byul/mcp"],
      "env": { "BYUL_API_KEY": "byul_api_key" }
    }
  }
}

​
Windsurf

windsurf_mcp.json: 
{
  "mcpServers": {
    "mcp-server-byul": {
      "command": "npx",
      "args": ["-y", "@byul/mcp"],
      "env": { "BYUL_API_KEY": "byul_api_key" }
    }
  }
}