Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.219 Home All releases olderv2.1.218 v2.1.220newer
Claude Code v2.1.219

Background sessions no longer respawn when the running one is newer

You'll notice
Useful3 Signal0
Sessions

Background sessions stop needlessly restarting when your running build is already newer.

What

Background session adoption compares the recorded session's cliVersion against the running build and skips the upgrade respawn when the running session is already newer, instead of treating any version difference as stale.

Details
  • affects both background session adoption and the upgrade-respawn path
  • a version mismatch alone is no longer sufficient to force a respawn
  • applies to everyone
Evidence

tengu_bg_adopt_upgrade_respawn

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.219 →