tengu_giggly_dragonfly
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.257, including the newest one read.
With input closed and no budget cap, a session with armed monitors can be held open past the background-task ceiling.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.
In the changelogs
4Releases whose published page names tengu_giggly_dragonfly.
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v2.1.295
Print mode now says what it is waiting for instead of seeming stuck
When
-pmode keeps waiting on background work or a scheduled wakeup, it now prints a one-time notice saying whygate cited by this entry
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v2.1.292
claude -pcan keep waiting for background commands past its time limitIn print mode Claude Code can hold on for background commands instead of stopping at the wait limit, and its give-up warning now lists running tasks
gate cited by this entry
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v2.1.269
Session/turn engine internals rewritten as classes
The engine driving interactive and headless sessions was rewritten as separate classes instead of one big function
gate cited by this entry
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v2.1.257
New wait condition can hold background-task shutdown for armed monitors
With input closed and no budget cap, a session with armed monitors can be held open past the background-task ceiling.
gate cited by this entry
Gate readings
4| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.295 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.292 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.269 | Not enough to say | no value returned | no value returned | on |
| v2.1.257 read on another version | Not enough to say | no value returned | no value returned | on |
Two arms, because they disagree: this account is the one account this site reads and anonymous is a baseline with no identity attached. A reading says nothing about your account, and off cannot rule out a rollout both readings sit outside of. What these readings can and cannot show.
First cited
1The earliest release whose published evidence quoted tengu_giggly_dragonfly was v2.1.257, 1 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
1Build by build
47One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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.