Feature request: Deep-link URL scheme for auto-adding MCP connectors

Problem

When an MCP server provider (like a hosting platform) onboards new users, the setup flow requires manual steps:

1. User signs up on the web
2. User opens Claude Desktop → Settings → Connectors → Add custom connector
3. User copies the MCP URL from the web dashboard
4. User pastes it into Claude Desktop

Steps 2-4 are friction that causes drop-off, especially for non-technical users.

Proposed solution

A registered URL scheme (e.g. claude://) that lets websites open Claude Desktop and pre-fill or auto-add a connector:

claude://add-connector?url=https://example.com/sse&name=My+Service

Clicking this link in a browser would:

1. Open Claude Desktop (if installed)
2. Show a confirmation dialog: "Add connector 'My Service'?"
3. On confirm, add the connector automatically

Why this matters

• Reduces setup from 4 steps to 1 click — dramatically improves activation
• Standard pattern — Slack (slack://), Zoom (zoommtg://), VS Code (vscode://) all use deep links for integration setup
• Benefits the entire MCP ecosystem — any MCP server provider could offer one-click setup
• For Claude Code too — a similar claude-code:// scheme or npx one-liner that auto-configures without manual claude mcp add commands

Current workaround

Web dashboards show a "click to copy" URL. Users paste it manually. This works but adds unnecessary friction to every MCP integration onboarding.

Context

Building an MCP-based hosting platform and hit this friction point during user onboarding. The web dashboard shows connection instructions but there's no way to bridge the gap between "web signup" and "Claude Desktop configured" without manual copy-paste.