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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 v2.0.2

Tool Use Concurrency Error Handler

What: New error handler for API 400 errors caused by tool use concurrency issues

How to recover: When you encounter this error, the system will display:

API Error: 400 due to tool use concurrency issues. Run /rewind to recover the conversation.

Details:

  • Detects when tool_use IDs are found without immediately following tool_result blocks
  • Provides clear recovery instructions using the existing /rewind command
  • The /rewind command restores both code state and conversation to a previous checkpoint
  • Evidence: Error handler at bk1() at line 385221

Why this matters: Provides users with actionable recovery steps instead of a generic API error message when tool execution gets out of sync.

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 v2.0.2 →