tengu_marble_heron
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.234, including the newest one read.
Your session can now wait out a usage limit and pick the task back up by itself.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.234.
In the changelogs
5Releases whose published page names tengu_marble_heron.
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v2.1.307
A server-controlled switch has a different built-in fallback value
The value Claude Code uses for one server-controlled switch when the server sends nothing changed from a text label to the number 8
gate cited by this entry, found in this entry's text
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v2.1.304
Groundwork for new server-controlled switches
Claude Code adds a new server-controlled switch and a new way to fetch switch values from the server
gate cited by this entry
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v2.1.290
Built-in fallback value of an internal remote setting changed
The value an internal remote setting falls back to changed from ".zshrc" to "commander.executeSubCommandAsync"
gate cited by this entry, found in this entry's text
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v2.1.290
A new experiment switch with no visible effect yet
Claude Code now names a new server-controlled experiment switch whose purpose is not shown
gate cited by this entry
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v2.1.234
Sessions can wait out a claude.ai usage limit and continue on their own
Your session can now wait out a usage limit and pick the task back up by itself.
gate cited by this entry, found in this entry's text
Gate readings
3| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.307 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
| v2.1.304 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
| v2.1.290 read on another version | Not enough to say | no value returned | no value returned | not a boolean we can read |
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_marble_heron was v2.1.290, 5 Oct 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
3Build by build
65One 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.