What it is
New CLAUDE_CODE_RESUME_REASON env var labels why an interrupted turn was resumed
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.268.
Presence across releases
1Build by build
12One 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.
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_RESUME_REASON was v2.1.268, 10 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 above.
Names beside it
Every environment variable in the inventory starting claude_code_resume, up to twelve of them.
CLAUDE_CODE_RESUME_FROM_SESSIONChild worker processes no longer inherit your session id, resume prompt or auth handles. v2.1.138
CLAUDE_CODE_RESUME_INTERRUPTED_TURNResuming a turn interrupted by shutdown now correctly sees the tool call as still pending instead of faked-answered. v2.1.138
CLAUDE_CODE_RESUME_INTERRUPTED_TURN_MAX_AGE_MSThe staleness cutoff for auto-resuming an interrupted turn is now configurable, defaulting to 6 hours v2.1.211
CLAUDE_CODE_RESUME_PROMPTChild worker processes no longer inherit your session id, resume prompt or auth handles. v2.1.140
CLAUDE_CODE_RESUME_SOURCE_ALIVENo description from anybody. v2.1.212
CLAUDE_CODE_RESUME_THRESHOLD_MINUTESNo description from anybody. v2.1.138
CLAUDE_CODE_RESUME_TOKEN_THRESHOLDNo description from anybody. v2.1.138
CLAUDE_CODE_RESUME_TOLERATES_CONTEXT_APPENDSResuming can pick up an interrupted tool call, but only with two env vars set. v2.1.242
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.