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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 v2.0.5

Removed Obsolete Tool Concurrency Error

What: Eliminated the "tool use concurrency issues" error message that instructed users to run /rewind to recover conversations.

Details:

  • The underlying API error condition (400 status for tool_use without tool_result blocks) is no longer expected
  • Suggests server-side fix has been implemented
  • Users will no longer encounter this specific error message
  • Evidence: Error handling removed from fk1() at lines 23711-23720 in v2.0.3

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 v2.0.5 →