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 v2.1.228 Home All releases olderv2.1.227 v2.1.229newer
Claude Code v2.1.228

Streamed tool inputs serialize correctly once complete

You'll notice
Useful3 Signal1
Tool Calls

Completed tool inputs no longer show up as empty when written out.

What

A tool call's assembled input is now a normal enumerable property, so a finished tool input serializes as expected rather than appearing empty.

Details
  • Partial JSON chunks are accumulated by a shared helper instead of a hand-rolled hidden buffer property on each delta.
  • At the end of a content block the accumulated input is redefined as enumerable, writable and configurable.
Evidence

input_json_delta

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

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 v2.1.228 →