CLAUDE_CODE_DEEP_TWILIGHT
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.317, including the newest one read.
A new CLAUDE_CODE_DEEP_TWILIGHT variable helps decide whether a prompt a host program sends mid-turn is treated as its own kind of input
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.317.
In the changelogs
3Releases whose published page names CLAUDE_CODE_DEEP_TWILIGHT.
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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 inputfound in this entry's text, named in this entry
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v2.1.317
New
CLAUDE_CODE_DISABLE_SUBAGENT_HANDBACKandCLAUDE_CODE_DEEP_TWILIGHTvariables appearTwo new environment variables appear in this build, and three existing ones were added to the same list
found in this entry's text, named in this entry
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v2.1.317
Two more environment variable names join Claude Code's session lists
Claude Code now lists
CLAUDE_CODE_FIZZY_GROVEandCLAUDE_CODE_DEEP_TWILIGHTalongside its other session environment variablesfound in this entry's text, named in this entry
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_DEEP_TWILIGHT was v2.1.317, 2 Nov 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
2One 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.