tengu_reactive_compact_succeeded
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.
Compaction telemetry now records the split kind and head truncations, and flags when the whole conversation was summarized.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.259.
In the changelogs
3Releases whose published page names tengu_reactive_compact_succeeded.
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v2.1.290
Compaction usage reports now record which summary prompt was used
Usage reports about automatic conversation compaction now record the summary prompt variant and whether a scope warning was given
found in this entry's text
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v2.1.267
Reactive compaction telemetry now reports cache-cold state
Reactive compaction telemetry now records whether the cache was cold
gate cited by this entry, found in this entry's text
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v2.1.259
Reactive compaction telemetry distinguishes full-summary splits
Compaction telemetry now records the split kind and head truncations, and flags when the whole conversation was summarized.
gate cited by this entry, found in this entry's text
Gate readings
0No 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.
First cited
1The earliest release whose published evidence quoted tengu_reactive_compact_succeeded was v2.1.267, 9 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.
Presence across releases
0The 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.