ANTHROPIC_ENVIRONMENT_KEY
A Claude Code environment variable, read out of the shipped bundle.
It was in the build from v2.1.145 and was gone by v2.1.246.
Nobody has written a line about this one. It is not in any of Anthropic's reference tables and no changelog entry here carries a description of it. It is in the build, which is the whole of what this page can claim.
First seen v2.1.145
Last seen v2.1.245 25 Aug 2026, gone by v2.1.246
Builds89 / 149on this box, as of v2.1.308
Written about — no changelog entry names it
v2.1.145in the build not in the build never minedv2.1.308
In the changelogs
0
No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.145 without anybody writing a line about it.
First cited
0
No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
2
BuildsHow manyDatesReading
v2.1.145 – v2.1.24589 builds → 25 Aug 2026 ◆in the build
v2.1.246 – v2.1.30853 builds25 Aug 2026 → 22 Oct 2026 ○not in the build
Build by build
142
One 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.
BuildDateStateThe record behind it
v2.1.1634 Jun 2026·presentverdict: present
v2.1.1655 Jun 2026·presentverdict: present
v2.1.1665 Jun 2026·presentverdict: present
v2.1.1676 Jun 2026·presentverdict: present
v2.1.1686 Jun 2026·presentverdict: present
v2.1.1698 Jun 2026·presentverdict: present
v2.1.1709 Jun 2026·presentverdict: present
v2.1.17210 Jun 2026·presentverdict: present
v2.1.17311 Jun 2026·presentverdict: present
v2.1.17411 Jun 2026·presentverdict: present
v2.1.17512 Jun 2026·presentverdict: present
v2.1.17612 Jun 2026·presentverdict: present
v2.1.17713 Jun 2026·presentverdict: present
v2.1.17815 Jun 2026·presentverdict: present
v2.1.17916 Jun 2026·presentverdict: present
v2.1.18117 Jun 2026·presentverdict: present
v2.1.18218 Jun 2026·presentverdict: present
v2.1.18319 Jun 2026·presentverdict: present
v2.1.18520 Jun 2026·presentverdict: present
v2.1.18622 Jun 2026·presentverdict: present
v2.1.18723 Jun 2026·presentverdict: present
v2.1.19024 Jun 2026·presentverdict: present
v2.1.19124 Jun 2026·presentverdict: present
v2.1.19325 Jun 2026·presentverdict: present
v2.1.19526 Jun 2026·presentverdict: present
v2.1.19629 Jun 2026·presentverdict: present
v2.1.19730 Jun 2026·presentverdict: present
v2.1.1981 Jul 2026·presentverdict: present
v2.1.1992 Jul 2026·presentverdict: present
v2.1.2003 Jul 2026·presentverdict: present
v2.1.2013 Jul 2026·presentverdict: present
v2.1.2026 Jul 2026·presentverdict: present
v2.1.2037 Jul 2026·presentverdict: present
v2.1.2048 Jul 2026·presentverdict: present
v2.1.2058 Jul 2026·presentverdict: present
v2.1.2069 Jul 2026·presentverdict: present
v2.1.20710 Jul 2026·presentverdict: present
v2.1.20813 Jul 2026·presentverdict: present
v2.1.20914 Jul 2026·presentverdict: present
v2.1.21014 Jul 2026·presentverdict: present
v2.1.21115 Jul 2026·presentverdict: present
v2.1.21216 Jul 2026·presentverdict: present
v2.1.21317 Jul 2026·presentverdict: present
v2.1.21418 Jul 2026·presentverdict: present
v2.1.21519 Jul 2026·presentverdict: present
v2.1.21620 Jul 2026·presentverdict: present
v2.1.21721 Jul 2026·presentverdict: present
v2.1.21822 Jul 2026·presentverdict: present
v2.1.21924 Jul 2026·presentverdict: present
v2.1.22024 Jul 2026·presentverdict: present
v2.1.2213 Aug 2026·presentverdict: present
v2.1.2224 Aug 2026·presentverdict: present
v2.1.2235 Aug 2026·presentverdict: present
v2.1.2247 Aug 2026·presentverdict: present
v2.1.2257 Aug 2026·presentverdict: present
v2.1.2268 Aug 2026·presentverdict: present
v2.1.22710 Aug 2026·presentverdict: present
v2.1.22811 Aug 2026·presentverdict: present
v2.1.22912 Aug 2026·presentverdict: present
v2.1.23113 Aug 2026·presentverdict: present
v2.1.23213 Aug 2026·presentverdict: present
v2.1.23314 Aug 2026·presentverdict: present
v2.1.23417 Aug 2026·presentverdict: present
v2.1.23518 Aug 2026·presentverdict: present
v2.1.23619 Aug 2026·presentverdict: present
v2.1.23719 Aug 2026·presentverdict: present
v2.1.23820 Aug 2026·presentverdict: present
v2.1.23921 Aug 2026·presentverdict: present
v2.1.24022 Aug 2026·presentverdict: present
v2.1.24122 Aug 2026·presentverdict: present
v2.1.24224 Aug 2026·presentverdict: present
v2.1.24324 Aug 2026·presentverdict: present
v2.1.24525 Aug 2026·presentverdict: present
v2.1.24625 Aug 2026·removedverdict: removed
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.
