Source Intelligence

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 v2.1.19 Home All releases olderv2.1.18 v2.1.20newer
Claude Code v2.1.19

Streaming Fallback on Empty Responses

What

Better handling of edge cases where API streaming fails to start.

Details
  • Detects when stream completes without receiving message_start event
  • Automatically triggers non-streaming fallback
  • Prevents hanging on incomplete stream connections
Evidence

Line 525690 ("Stream completed without receiving message_start event - triggering non-streaming fallback")

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

See this entry in the whole of v2.1.19 →