What
When Claude Code starts, it runs migrations: steps that update your saved configuration to match newer versions. A new environment variable, CLAUDE_CODE_CCR_SKIP_FRESH_MIGRATIONS, lets it skip them. An environment variable is a named value you set outside Claude Code, for example in your shell. Claude Code skips the migrations only when all of these are true:
CLAUDE_CODE_CCR_SKIP_FRESH_MIGRATIONSis set.- Claude Code is running in a remote session.
- The configuration has not been customised: no
autoUpdatesset to false, no model setting, and none of the other listed changes.
In that case Claude Code marks every migration as done and goes straight on without running any of them. Without the variable, every migration runs in order as before.
Why
This is an opt-in way to start cloud sessions faster, since a fresh configuration has nothing for the migrations to update.
Names in the bundleCLAUDE_CODE_CCR_SKIP_FRESH_MIGRATIONS
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear exactly what the remote-session condition checks.
The name it cites is new in this build
New in this build: CLAUDE_CODE_CCR_SKIP_FRESH_MIGRATIONS