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

Remote control gains reconnect and reactivation heartbeats, all off by default

Not switched on
Useful2 Signal3
Remote Control

Remote control adds reconnect, reactivation and idle heartbeats, each behind a gate that defaults off.

Three heartbeat triggers exist with fallbacks of off; real values come from remote config.

Feature flag
tengu_ccr_reconnect_beat On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.228: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

tengu_ccr_reactivation_beat On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.228: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

tengu_ccr_idle_heartbeat On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.228: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.228. It isn't a statement about your account. What a flag value here can and cannot tell you

What

The remote-control connection's liveness probe is renamed to heartbeat probe throughout, and two new triggers are added: a beat after a reconnect that found the connection stale, and a beat when activity resumes after idle. Each has its own gate, tengu_ccr_reconnect_beat, tengu_ccr_reactivation_beat and tengu_ccr_idle_heartbeat, all falling back to off, with the real values coming from remote config.

Details
  • Renamed pieces include onHeartbeatProbe, advertiseHeartbeatProbeSupport and the log line cli_sse_heartbeat_probe_received.
  • Successful beats report as ccr_heartbeat_probe, ccr_reconnect_beat or ccr_reactivation_beat.
Evidence

ccr_reactivation_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 →