CLAUDE_CODE_SESSION_KIND

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.138, including the newest one read.

Releases whose published page names CLAUDE_CODE_SESSION_KIND.

1. v2.1.290 5 Oct 2026
   Background sessions ignore --allow-dangerously-skip-permissions without recorded consent

   Background sessions now ignore --allow-dangerously-skip-permissions unless bypass consent is in your user or policy settings

   found in this entry's text

2. v2.1.290 5 Oct 2026
   Clearer error when a session writes into a different worktree

   When an isolated session tries to write into another worktree, Claude Code now says so instead of calling it the shared checkout

   found in this entry's text

3. v2.1.281 23 Sep 2026
   Managed-settings consent is deferred in background sessions spawned by a gateway host

   The managed-settings security check is now deferred in background sessions launched through a gateway host

   found in this entry's text

4. v2.1.259 2 Sep 2026
   Background sessions get a narrower permission snapshot

   Background sessions run with session allow-rules cleared and a narrower set of working directories, and always snapshot the system prompt.

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

5. v2.1.251 28 Aug 2026
   Background sessions can inherit plan and rate-limit tier from the environment

   Two env vars let background dispatchers inherit your plan and rate tier without an API call.

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

6. v2.1.233 14 Aug 2026
   Warning when an unrecognized model is sent to the API

   You get a one-time warning line if a query names a model Claude Code does not recognise.

   found in this entry's text

The earliest release whose published evidence quoted CLAUDE_CODE_SESSION_KIND was v2.1.259, 2 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.