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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

Backgrounding a session no longer fails when the worker is already running

You'll notice
Useful3 Signal2
Background Tasks

Sending a session to a background agent succeeds when the worker is already running.

What

Sending the session to a background agent with the left arrow now counts an already-running worker as a successful hand-off instead of treating it as a failure. A spawn that neither succeeded, queued, nor is alive now abandons the hand-off and runs an extra cleanup pass.

Details
  • The spawn is given a worker name, and session scratch state gets a second cleanup call.
Evidence

tengu_open_agents_via_left

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 →