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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.

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Claude Code v2.1.228

Twelve more caches moved onto the session object

Under the hood
Useful2 Signal2
Session State

A dozen caches now hang off the session and are inherited when a session forks.

What

The session object used to carry one field and now carries a dozen, including observers, fallback history, prompt suggestions, pending hints, plugin sync, tool progress throttling, stashed write permissions and the autonomous loop preamble. Each is inherited from the root session when a session forks.

Details
  • This is why hundreds of call sites in this area gained a session argument, including observer pairing, auto-mode classifier telemetry, marketplace and plugin cache invalidation, hook registration and transcript sharing.
  • These caches are no longer shared between sessions running in the same process.
Evidence

sessionRefsGate

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.228 →