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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.

All of v2.1.27 Home All releases olderv2.1.26 v2.1.28newer
Claude Code v2.1.27

Improved Transcript/JSONL File Validation

Reading transcript files now provides clearer error messages when files are malformed:

  • "No messages found in JSONL file" - when JSONL file parses but contains no messages
  • "No valid conversation chain found in JSONL file" - when messages exist but no valid chain can be reconstructed
  • "Invalid JSON in transcript file" - when JSON parsing fails
  • "Transcript messages must be an array" / "Transcript must be an array of messages or an object with a messages array" - format validation
Evidence

JSONL validation (search for "No messages found in JSONL file")

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

See this entry in the whole of v2.1.27 →