Like other launchers, the launcher now starts the game only while an
account in it owns Java Edition (Ludovic's decision, 2026-10-27).
- account::launch is the owner gate: it asks the Minecraft services
again (entitlements and profile, after the token renewal), the
selected account first, until one owns the game. Each answer is kept
in the keychain item beside the tokens. No answer (no network) keeps
the last one; "doesn't own" blocks at once.
- Every Play goes through it: the window (Home, instances, packs),
`horizon-launcher play` and `modpack play`, the MCP's play.
- Offline names are added and played only beside an owner; signing the
last owner out keeps them, unplayable.
- Home shows "Sign in with a Microsoft account that owns Minecraft:
Java Edition to play" with Sign in; the "coming soon" sign-in strings
are gone.
- The game binary, harnesses, CI and the servers are unchanged.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Ludovic Marie
ce64c617e9