How to use environment variables in mcp.json

How To
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I added my workarounds to this in MCP.json pass secrets securely - Feature Requests - Cursor - Community Forum - quoting from there:

Here are my personal knowledge garden entries which mention workarounds that use the 1Password CLI op to wrap invocation of various MCPs:

GitHub/MCP/How To/Set up in Cursor with 1Password GH token

Anthropic/App/Claude Code/How To/Set Up Github MCP with 1Password GH token and mise

The basic approach I use is to create an executable script which controls the environment variables used to instantiate the process that runs the MCP server.