tengu_parsed_willow
A Claude Code feature flag, read out of the shipped bundle. It has been in the build since v2.1.277, including the newest one read.
New tengu_parsed_willow gate (defaulting on) added with CLAUDE_CODE_PARSED_WILLOW env override
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.277.
In the changelogs
4Releases whose published page names tengu_parsed_willow.
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v2.1.317
CLAUDE_CODE_DEEP_TWILIGHTcontrols how mid-turn prompts from a host are sortedA new
CLAUDE_CODE_DEEP_TWILIGHTvariable helps decide whether a prompt a host program sends mid-turn is treated as its own kind of inputgate cited by this entry
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v2.1.281
Deciding whether a message counts as a human turn now ignores messages made only of wrapped blocks
A message made up only of wrapped blocks is no longer counted as a human turn
gate cited by this entry, found in this entry's text
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v2.1.277
New gate tengu_parsed_willow (default on) with env override
New tengu_parsed_willow gate (defaulting on) added with CLAUDE_CODE_PARSED_WILLOW env override
gate cited by this entry, found in this entry's text, named in this entry
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v2.1.277
New env var CLAUDE_CODE_PARSED_WILLOW overrides tengu_parsed_willow (marks turns as human-authored)
A new CLAUDE_CODE_PARSED_WILLOW environment variable can override marking queued commands as human-authored
gate cited by this entry, found in this entry's text
Gate readings
3| Release | Resolved | This account | Anonymous | Compiled default |
|---|---|---|---|---|
| v2.1.317 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.281 read on another version | Not enough to say | no value returned | no value returned | on |
| v2.1.277 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_parsed_willow 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
41One 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.