tengu_auto_mode_server_fallback_notice

A Claude Code feature flag, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.

Releases whose published page names tengu_auto_mode_server_fallback_notice.

1. v2.1.281 23 Sep 2026
   Auto-mode fallback warning dialog can now appear in SDK hosts (tengu_expressive_galaxy, fallback on)

   The auto-mode fallback warning can now appear inside SDK host apps that support it, when tengu_expressive_galaxy allows

   found in this entry's text

2. v2.1.281 23 Sep 2026
   Auto mode server-fallback notice: abort-aware and SDK host handling

   The auto mode server-fallback notice now respects a stopped turn and treats SDK hosts differently when deciding whether to show

   found in this entry's text

No release here has a gate table behind it for this flag. Most published releases have none at all: the readings exist only for versions the pipeline captured flag state on.

The earliest release whose published evidence quoted tengu_auto_mode_server_fallback_notice was v2.1.281, 23 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.

The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the feature flag does. All feature flags.