tengu_rosy_wren
A Claude Code feature flag, read out of the shipped bundle. It was in the build from v2.1.234 and was gone by v2.1.268.
Spawned teammates only hear about the shared task list when they actually have task tools.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.233.
In the changelogs
3Releases whose published page names tengu_rosy_wren.
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v2.1.233
Teammates are only told about the task list when they can use it
Spawned teammates only hear about the shared task list when they actually have task tools.
gate cited by this entry, found in this entry's text
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v2.1.233
Task tools now follow the todo-tools flag rather than an org denylist
Task tools now turn on via the tasks and todo-tools env vars instead of an organization denylist.
gate cited by this entry, found in this entry's text
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v2.1.233
Todo tools switched off for several models
Todo tools are now off for several models unless you set CLAUDE_CODE_ENABLE_TODO_TOOLS=true.
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_rosy_wren was v2.1.233, 14 Aug 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
2Build by build
64One 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.