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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 v2.1.227

Teammate pane creation serialised under tmux and iTerm2

You'll notice
Useful3 Signal3
Teammates

Spawning several teammates at once no longer races when splitting tmux or iTerm2 panes.

What

Spawning several teammates at once no longer races when splitting terminal panes. Both the tmux and iTerm2 backends now take a lock before creating a pane and release it in a finally block.

Details
  • Only applies when running inside tmux or iTerm2; other terminals are unaffected.
Evidence

paneCreationLock

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 v2.1.227 →