CLAUDE_CODE_HUMBLE_HAMMOCK
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.257, including the newest one read.
The env var controlling print and engine loop behavior was renamed to CLAUDE_CODE_HUMBLE_HAMMOCK and still defaults to off.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.257.
In the changelogs
7Releases whose published page names CLAUDE_CODE_HUMBLE_HAMMOCK.
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v2.1.282
Whether tool inputs are echoed to the API is now fixed for the whole session
The choice to echo tool inputs back to the API is now made once per session and kept when you resume, instead of rechecked every call
found in this entry's text
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v2.1.282
Resumed sessions keep more of the prompt format they started with
Resuming a session now restores more saved choices about how the prompt was laid out, instead of picking them again
found in this entry's text
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v2.1.281
CLAUDE_CODE_TETHER_LIVE=true now opts in to several related threads/tether features and bypasses first-party checks
CLAUDE_CODE_TETHER_LIVE=truenow also turns on related threads features and skips some endpoint checksfound in this entry's text
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v2.1.281
Dark-launched attachment hooks (tengu_humble_hammock, build-time-false branch)
The humble hammock switch now also decides whether copies of tool input are placed into messages when attachments are built
found in this entry's text, named in this entry
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v2.1.281
Stellar-drift and humble-hammock features forced on when the CLAUDE_CODE_TETHER_LIVE opt-in holds
CLAUDE_CODE_TETHER_LIVEcan now force the stellar-drift and humble-hammock features on for first-party usefound in this entry's text
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v2.1.281
toolInputCopies recorded in declared-tools state behind tengu_humble_hammock
Declared-tool entries can carry a toolInputCopies list, applied only when tengu_humble_hammock or CLAUDE_CODE_HUMBLE_HAMMOCK is on
found in this entry's text, named in this entry
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v2.1.257
Renamed/relaunched print-engine-loop flag as 'humble hammock'
The env var controlling print and engine loop behavior was renamed to CLAUDE_CODE_HUMBLE_HAMMOCK and still defaults to off.
found in this entry's text, named in this entry
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_HUMBLE_HAMMOCK was v2.1.257, 1 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
59One 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 environment variable does. All environment variables.