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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 v2.1.246

Background daemon spawn survives an npm reinstall in progress

You'll notice
Useful2 Signal1
Background Tasks

Starting the background helper during an npm reinstall now waits and retries instead of failing.

What

If Claude Code tries to launch its background daemon while npm is replacing the package on disk, spawn now waits for the binary to reappear and retries instead of failing outright.

Details
  • Triggered only when the launcher path is under /node_modules/@anthropic-ai/ and the failure is one of ENOENT, EACCES, ENOEXEC, ETXTBSY or similar.
  • Recorded as tengu_bg_daemon_spawn_reinstall_wait with waited_ms, recovered, respawn_ok and the errno.
  • Spawn now also returns the child's pid and exit promise, and the connect path records connect_errno when it gives up.
Evidence

tengu_bg_daemon_spawn_reinstall_wait

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.246 →