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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
Claude Code v2.1.259 ·

Two new CCR (remote-control) heartbeat/upload tuning gates

Remote-control worker connections gained tuning gates for an upload hold delay and for skipping redundant heartbeats.

TierUnder the hoodhow much it should matter to you
Useful2my rating, 1 to 5
Signal3worth watching, 1 to 5
AreaRemote Controlwhat it touches
KindInternal Changesin v2.1.259,
Under the hood No documentation found

Remote-control worker connections gained tuning gates for an upload hold delay and for skipping redundant heartbeats.

The remote-control (CCR) worker connection gained two new tuning gates: a hold delay, tengu_ccr_no_subscriber_hold_ms, before dropping uploads when there's no subscriber, and a switch to skip sending redundant heartbeats.

Read from
Names in the bundletengu_ccr_no_subscriber_hold_ms
Feature flag
tengu_ccr_no_subscriber_hold_ms Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.259: no gate table built for this version

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_skip_redundant_heartbeat Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.259: off

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 v2.1.259. It isn't a statement about your account. What a flag value here can and cannot tell you

What has happened since
Flag reading moved The flag server now returns 10000 for tengu_ccr_no_subscriber_hold_ms, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns null for tengu_ccr_no_subscriber_hold_ms, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.
Flag reading moved The flag server now returns 10000 for tengu_ccr_no_subscriber_hold_ms, read as this account. A reading is one sample. Claude Code evaluates its flags remotely, so no client sees the targeting rule behind a value and this says nothing about your account.

See this across every release →

How sure we are
One source agreesOne thing we can check says the same as this entry.
The name it cites is new in this buildNew in this build: tengu_ccr_no_subscriber_hold_ms

See this entry in the whole of v2.1.259 →

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