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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.248 ·

Cloud sessions batch stream events and hold them back when nobody is watching

Cloud sessions batch stream events and can hold them back when nobody is watching.

You'll notice Nothing to try yet New Features
JSON All of v2.1.248
You'll noticeTier: how much it should matter to you
1Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Cloud SessionsArea: what it touches
New FeaturesKind: in v2.1.248,
New FeaturesSection of the release

The no-subscriber hold is wired but its interval defaults to 0, so it does nothing.

What

The client that ships events for remote and cloud sessions gained a batch upload path and an awareness of whether anyone is subscribed to the stream. When the last server report said there were no subscribers, ephemeral stream events are buffered for the longer of the no-subscriber interval and the normal flush interval, and flushed immediately once a subscriber shows up. The extra delay comes from tengu_ccr_no_subscriber_flush_ms, default 0, which disables it.

Details
  • Single-event writes now go through the batch path.
  • Values are clamped to 0 through 60000; a non-finite value is logged and ignored.
  • Delivery reports of "received" mark subscribers as present, ending the delay early.
  • Consecutive thinking_tokens system events in the buffer are merged, summing their estimated token deltas.
Evidence

setNoSubscriberStreamEventFlushIntervalMs

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

Read from
Feature flag
tengu_ccr_no_subscriber_flush_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 v2.1.248: not a boolean we can read

Read once, for one account on one subscription tier, against v2.1.248. 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 null for tengu_ccr_no_subscriber_flush_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 2000 for tengu_ccr_no_subscriber_flush_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_flush_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 2000 for tengu_ccr_no_subscriber_flush_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_flush_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 2000 for tengu_ccr_no_subscriber_flush_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_flush_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 2000 for tengu_ccr_no_subscriber_flush_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_flush_ms

See this entry in the whole of v2.1.248 →

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