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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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Event writer sends a batch in one call

Under the hood
Useful2 Signal2
Cloud Sessions

Event batches are sent in one call, removing a mid-batch failure case.

What

The event writer replaces a hand-rolled sequential batch loop, which could report "transport_closed_mid_batch", with a single write call, and its close now accepts a retain option.

Details
  • Adds take, discard and adopt operations so a successor connection can pick up events that never reached the client.
Evidence

retainUndeliveredClientEvents

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

See this entry in the whole of v2.1.248 →