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Claude Code v2.1.221 ·

Gate for skipping subagent event reads during delta rehydrate

A switch can skip one hydration read to speed session resume, but it is off.

Nothing to try yet Notable No documentation found In Development
JSON All of v2.1.221
Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SessionsArea: what it touches
In DevelopmentKind: in v2.1.221,
What probably matters to youSection of the release

A remote gate tengu_ccr_subagent_skip_on_delta can drop subagent event reads during resume, defaulting off.

What

A new remote-config gate can drop the subagent internal-event read from hydration when delta rehydration is already active.

Details
  • Gate is tengu_ccr_subagent_skip_on_delta, fallback false.
  • Takes effect only when both this gate and delta rehydration are on; the subagent read is then removed from the parallel prefetch.
  • With the fallback, hydration prefetches subagent internal events as before.
Evidence

tengu_ccr_subagent_skip_on_delta

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

Read from
Names in the bundletengu_ccr_subagent_skip_on_delta
Feature flag
tengu_ccr_subagent_skip_on_delta Off in both readings

The flag server returned off for the account this site reads and for the anonymous baseline. A reading of off cannot rule out a rollout these two readings sit outside of.

This account: off · anonymous baseline: off · compiled default in v2.1.221: 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 v2.1.221. 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 off for tengu_ccr_subagent_skip_on_delta, 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 nothing at all, having stopped carrying it for tengu_ccr_subagent_skip_on_delta, 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_subagent_skip_on_delta

See this entry in the whole of v2.1.221 →

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