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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.

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Claude Code v2.1.219

New "engine" prerelease channel recognized for worker respawn

Under the hood
Useful1 Signal0
Elsewhere

Background workers now recognise a second build channel and won't respawn themselves across channels.

What

Background worker and daemon respawn now understands a second prerelease channel and refuses to upgrade across channels.

Details
  • The version regex accepts engine alongside dev|alpha|beta|rc|test|nightly as a prerelease tag
  • A new helper set ["dev", "engine"] classifies a version by which of those tags its build string contains
  • A -dev. worker is not respawned as -engine. or vice versa; previously only the dev tag was understood
  • This build reports VERSION "2.1.219"
Evidence

nightly|engine

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 →