Requires the runtime declared in the upstream repo — check the README before running. Claude Code persists MCP servers via its CLI — no config file to edit, just run the command below once. Paste the config below, then follow the reload step to register CalendarMCP.
Run the command below in your terminal — Claude Code persists it for you.claude mcp add calendar --env MCP_AUTH_HEADER=Authorization: Bearer YOUR_CALENDARMCP_API_KEY -- npx @modelcontextprotocol/server-fetch https://calendarmcp.ai/api/mcp