Feature: open Claude Desktop to a specific session UUID via CLI flag or deep link

Summary

No supported way to launch Claude Desktop (Windows/Mac/Linux) directly into a specific session by UUID. Restart / session-sharing / external-launcher tooling has to leave the user at the home screen.

Use case

Building a /restart plugin for Claude Code (forty4420/cc-restart — private testing, plan to make public). Flow:

1. User: "restart yourself" (or /restart)
2. Plugin preflights (dirty git, running background work)
3. Plugin captures the current session UUID from the child CLI process command line (--resume <uuid>)
4. Plugin gracefully closes desktop via WM_CLOSE (so Electron persists state)
5. Plugin relaunches Claude.exe

Step 5 works, but the app opens to the home screen. There is no CLI flag or deep-link that can say "open session <uuid>".

What I tried

• Claude.exe --resume <uuid> — flag ignored
• claude://... URL protocol handler is registered (HKCU\Software\Classes\claude), but no documented path format
• Disassembled app.asar — found claude-nest: / claude-nest-dev: / claude-nest-prod: protocols referenced, but no /session/ route
• Local Storage / leveldb persistence is binary-encoded and not a documented surface
• --remote-debugging-port flag is dropped because of Electron's single-instance lock (new launches are redirected to the running PID, flags stripped)

Ask

Either of these unlocks a lot of external tooling:

A. CLI flag

Claude.exe --resume <session-uuid>

Opens desktop directly to that session, or noop-with-warning if unknown UUID.

B. Deep link

claude://session/<session-uuid>

or equivalent. Route the existing registered claude:// URL handler to the session router.

Why this matters

Unblocks:

• Self-restart plugins (preserve active session across restart)
• Session bookmarking / sharing between machines via URL
• External task launchers ("open Claude to session X when this build finishes")
• IDE integrations that want to jump to a specific conversation

Related: #34320 (terminal /restart), #46927 (cowork restart loses sessions).

Platform

Windows 11. Claude Desktop 1.3109.0 (MSIX). Willing to test on mac/linux too if useful.