I must have somehow misconfigured my GitHub MCP server:
...
"mcp": {
"github": {
"type": "remote",
"url": "https://api.githubcopilot.com/mcp/"
},
...
However even if I've got it wrong, it shouldn't make a mess of the terminal, but I see this:

