{"version":"2.1.257","anchor":"sync-transport-auth-handshake-option-feature-flagged","canonical_anchor":"sync-transport-auth-handshake-option-feature-flagged","heading":"Sync-transport auth handshake option (feature-flagged)","tier":"soon","area":"Artifacts","scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.257\/e\/sync-transport-auth-handshake-option-feature-flagged","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.257","markdown":"### Sync-transport auth handshake option (feature-flagged)\n\nBehind a flag, the sync-transport handshake can use a sync token instead of the existing live subscription token.\n\nBehind a feature flag, the sync-transport auth handshake can now pick a `\"sync\"` token transport when a sync client and `syncToken` are present, instead of always using the existing `\"live\"`\/`subscriptionToken` transport.\n\n- Flag `tengu_slate_lantern`: Off by default, switched on for this account (read for one account on one subscription tier against v2.1.257; this account: on, anonymous baseline: on, compiled default: off) These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.\n- Area: Artifacts\n- Names: `syncToken`\n- Tier: Nothing to try yet\n- Useful: 2\/5\n- Signal: 3\/5\n- Present in the build but not switched on"}