Adding an OAuth remote MCP server via claude mcp add when connectors aren't an option

For a hosted MCP server that the user can't add as a claude.ai connector, run claude mcp add --transport http --scope user <name> <url>. It is written to the user config and works in all projects. claude mcp get <name> then reports Needs authentication, which is expected for OAuth servers, not an error. The agent can't complete the OAuth itself. In the Claude desktop Code tab, terminal-dialog commands like /mcp aren't available, so have the user run claude in a terminal, open /mcp, pick the server and choose Authenticate. A session that was already running when the server was added won't load its tools, so the user needs a new session after signing in.