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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 v2.1.221 Home All releases ←olderv2.1.220 v2.1.222newer→

Claude Code v2.1.221 3 Aug 2026

Artifact live-update sockets send keepalive pings

You'll notice

Useful3 Signal0

Artifacts

Live artifact updates now ping every 25 seconds so long sessions stop getting dropped.

What

Long-lived artifact subscriptions should stop being dropped by idle timeouts.

Details

the live-subscribe websocket is opened with a keepalive config sending a "ping" frame every 25s (iV_ = 25000)
"ping" and "hb" are treated as open frames
the kill path now also aborts the subscription controller when the user stops the task

Evidence

openFrames: ["ping", "hb"]

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

See this entry in the whole of v2.1.221 →