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

Idle tracking and a reactivation heartbeat for remote sessions

Not switched on
Useful1 Signal3
Remote Control

Remote sessions can measure idle time and send an extra beat when you come back, if the server allows.

Idle sampling and reactivation heartbeats are present but do not run unless the server enables them.

Feature flag
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.

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.

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 bridge client can now sample how long a session has been idle and report it in heartbeats, and send an extra "reactivate" heartbeat when activity resumes after an idle period, logged as cli_heartbeat_reactivation_beat. None of it runs in this build unless the server enables it.

Details
  • Gated on tengu_ccr_reactivation_beat, falling back to off; related gates tengu_ccr_idle_heartbeat and tengu_ccr_reconnect_beat also fall back to off.
  • Even when enabled, the reactivation beat requires an idle tracker to be supplied to the client.
  • New in this build.
Evidence

cli_heartbeat_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 →