CLAUDE_CODE_MORNING_BRIEF_PROMPT
A Claude Code environment variable, read out of the shipped bundle. It was in the build from v2.1.207 and was gone by v2.1.213.
Replaces the built-in prompt of the /morning command. The value is trimmed and used only if it is between 500 and 50000 characters long; otherwise the bundled morning brief prompt is used. Any arguments given to /morning are appended under a ## User Request heading.
Not Anthropic's. Written by Claude Opus 5.5 from reading the v2.1.212 bundle, and it can be wrong.
In the changelogs
3Releases whose published page names CLAUDE_CODE_MORNING_BRIEF_PROMPT.
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v2.1.213
Morning Brief Feature Removed
found in this entry's text
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v2.1.207
Morning Brief Skill (
/morning)found in this entry's text
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v2.1.207
Morning Brief for Non-Cowork Sessions [In Development]
found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_MORNING_BRIEF_PROMPT was v2.1.213, 17 Jul 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
2Build by build
90One 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.