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 v2.1.246 Home All releases olderv2.1.245 v2.1.247newer
Claude Code v2.1.246

Error results and stream events echo the originating prompt id

Use it now
Useful2 Signal2
SDK not in their notes

Errors and stream events now echo the prompt id that started the turn.

user_message_uuid
What

The error result message and the first non-ping stream event of a turn can both carry user_message_uuid, the client uuid of the prompt that started the turn, so a stream or a failure can be matched to its send immediately.

Details
  • The schema field is optional, so older producers simply omit it.
  • Absent on meta and scheduled turns and on any turn submitted without a client uuid.
Evidence

Client uuid of the user message that triggered this turn (submitMessage options.uuid), stamped on the turn's FIRST non-ping stream event only

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

See this entry in the whole of v2.1.246 →