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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 v2.1.20

Message Structure Repair

What

Automatic repair of malformed tool result pairings in conversation history.

Details
  • Detects and repairs missing tool_result blocks
  • Logs: ensureToolResultPairing: repaired missing tool_result blocks (X -> Y messages)
  • Prevents conversation corruption from improperly paired tool uses
Evidence

Repair logging at line 469512

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

See this entry in the whole of v2.1.20 →