CLAUDE_CODE_MARL_CORMORANT
A Claude Code environment variable, read out of the shipped bundle. It was in the build from v2.1.215 and was gone by v2.1.224.
Boolean. When true, the Bash tool's description gains the line - Command output is displayed to you, not reliably to the user. The same line is also added when the tengu_marl_cormorant flag is on, or when the model's prompt settings enable it.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.223 bundle, and it can be wrong.
In the changelogs
1Releases whose published page names CLAUDE_CODE_MARL_CORMORANT.
-
v2.1.215
Marl Cormorant Feature Flag [In Development]
found in this entry's text
First cited
0No 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
2Build by build
82One 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.