tengu_melodic_wolf
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.242, including the newest one read.
Subagent results can be tagged to show which parts Claude Code wrote versus the model.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.242.
In the changelogs
5Releases whose published page names tengu_melodic_wolf.
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v2.1.277
Handback provenance flag now defaults on
The setting controlling subagent report anti-injection wrapping now defaults to on
gate cited by this entry, found in this entry's text
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v2.1.277
tengu_melodic_wolf fallback flips true
The tengu_melodic_wolf gate behind subagent report provenance now defaults to on if unset
gate cited by this entry, found in this entry's text
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v2.1.277
CLAUDE_CODE_HANDBACK_PROVENANCE now defaults to enabled (tengu_melodic_wolf flipped to true)
The anti-injection wrapper for subagent reports (CLAUDE_CODE_HANDBACK_PROVENANCE) now defaults to on via the tengu_melodic_wolf gate
gate cited by this entry, found in this entry's text
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v2.1.242
Subagent results can carry a provenance frame that skips the hand-off review
Subagent results can be tagged to show which parts Claude Code wrote versus the model.
gate cited by this entry, found in this entry's text
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v2.1.242
Subagent reports get an anti-injection wrapper, switched off in this build
Subagent reports can be wrapped so embedded instructions cannot pass as your commands, off here.
gate cited by this entry, found in this entry's text
Gate readings
2| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.277 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.242 | Not enough to say | no value returned | no value returned | off |
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
3The earliest release whose published evidence quoted tengu_melodic_wolf was v2.1.277, 18 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
57One 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.