tengu_bg_classify

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_bg_classify.

1. v2.1.277 18 Sep 2026
   Background thread classifier drops "turn brief" summarization

   Background thread classifier no longer produces its experimental "turn brief" summaries

   found in this entry's text

2. v2.1.274 16 Sep 2026
   Background classifier gains a (currently dark) turn-brief tail-length knob

   Background classifier gets a new, currently inactive setting to control how much recent conversation text it quotes

   gate cited by this entry

3. v2.1.265 8 Sep 2026
   New 'Projects' thread recap classification path, gated off by default

   A new 'Projects' recap mode for the background classifier can summarize thread status, currently unread/off

   gate cited by this entry, 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.

No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.

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.