CLAUDE_CODE_NONBLOCKING_STDOUT

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.261, including the newest one read.

Releases whose published page names CLAUDE_CODE_NONBLOCKING_STDOUT.

1. v2.1.288 2 Oct 2026
   Typing now clears queued screen-reader announcements, and right-click copy drops the selection first

   A keypress now clears held screen-reader announcements and redraws the screen, and right-click copy first removes the current selection

   found in this entry's text

2. v2.1.267 9 Sep 2026
   Non-blocking stdout can now be enabled by a remote flag, not just an env var

   Non-blocking stdout writes can now be turned on remotely, not just via an environment variable

   found in this entry's text, named in this entry

3. v2.1.261 4 Sep 2026
   New CLAUDE_CODE_NONBLOCKING_STDOUT env var for Ink renderer

   A new env var stops Claude Code from hanging when stdout is slow, like when piped somewhere.

   found in this entry's text, named in this entry

The earliest release whose published evidence quoted CLAUDE_CODE_NONBLOCKING_STDOUT was v2.1.261, 4 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 below.

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.

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.