Originally published at https://aicoding-guide.com . Hosted MCP servers like Sentry, Linear and Notion are not usable the moment you register their URL. They need a browser sign-in first, and claude mcp list shows them as ! Needs authentication until you do it. In short: add the server with claude mcp add --transport http <name> <url> , then either run /mcp in a session and choose Authenticate on that server, or run claude mcp login <name> from your shell. To...