CLAUDE_CODE_COUNT_GARBAGE_COLLECTIONS
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.311, including the newest one read.
SDK result messages gain fields for memory clean-up counts and process tuning, reported only on Anthropic-hosted cloud workers that opt in
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.311.
In the changelogs
2Releases whose published page names CLAUDE_CODE_COUNT_GARBAGE_COLLECTIONS.
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v2.1.311
Result messages can report memory clean-up counts, opt-in by environment variable
SDK result messages gain fields for memory clean-up counts and process tuning, reported only on Anthropic-hosted cloud workers that opt in
found in this entry's text
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v2.1.311
Garbage-collection counts can be reported from Anthropic's cloud workers
Result messages can now carry process start and garbage-collection figures, sent only from Anthropic-hosted cloud workers with telemetry on
found in this entry's text
First cited
2The earliest release whose published evidence quoted CLAUDE_CODE_COUNT_GARBAGE_COLLECTIONS was v2.1.311, 26 Oct 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.