tengu_swirling_meteor
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.274, including the newest one read.
New gate 'tengu_swirling_meteor' controls grouping of background task notifications
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.274.
In the changelogs
5Releases whose published page names tengu_swirling_meteor.
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v2.1.318
Creating an artifact from a type is now marked as providing stored text
The artifact action for creating from a type is now marked as giving back stored text, which may affect read-before-edit tracking
gate cited by this entry
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v2.1.299
Turns wait for plugins and stop if your organization's mods fail to load
Claude Code now waits for plugins to finish setting up before a turn, and refuses to start if your organization's mods cannot be loaded
gate cited by this entry
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v2.1.285
Memory context starts loading earlier in each session
Claude Code now starts loading memory context early in a session, checks it again after each turn, and times each stage of a turn
gate cited by this entry
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v2.1.274
New gate for coalescing background task notifications
New gate 'tengu_swirling_meteor' controls grouping of background task notifications
named in this entry, gate cited by this entry, found in this entry's text
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v2.1.274
New task-notification coalescing path in the queued-message engine, gated off by default (compiled)
New option lets a background task notification merge into the current turn instead of interrupting it
named in this entry, gate cited by this entry, found in this entry's text
Gate readings
4| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.318 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.299 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.285 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.274 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
2The earliest release whose published evidence quoted tengu_swirling_meteor was v2.1.274, 16 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
42One 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.