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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.

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Claude Code v2.1.228 11 Aug 2026

Heartbeats report idle time and fire an extra beat after a stale reconnect

Under the hood

Useful1 Signal2

Sessions

Session heartbeats now say how long you have been idle and advertise probe support under a new name.

What

Heartbeats now include how many seconds the session has been idle, and the field advertising probe support was renamed to supports_heartbeat_probe.

Details

After reconnecting, if the last good heartbeat is older than 1.5 times the current interval and no rate-limit response was seen recently, one extra beat is sent and reported as cli_heartbeat_reconnect_stale_beat.

Evidence

cli_heartbeat_reconnect_stale_beat

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

See this entry in the whole of v2.1.228 →