Source Intelligence

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 v2.1.236 Home All releases olderv2.1.235 v2.1.237newer
Claude Code v2.1.236

Version 5 session storage is decided once per process

Under the hood
Useful3 Signal4
Sessions

Whether the newer session storage is used is decided once at startup and cannot change mid-session.

Feature flag
tengu_hover_rest 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 v2.1.236: on

Read once, for one account on one subscription tier, against v2.1.236. It isn't a statement about your account. What a flag value here can and cannot tell you

What

The newer v5 session-storage backend used to be consulted wherever a caller happened to check tengu_hover_rest or simply passed a v5 handle. This build reads the flag once at startup and pins the answer, and every v5 path now checks the pinned value too: session file writes, plugin listing, sidecar writes, session-metadata re-append, config backup listing, and skill and plugin existence checks. Passing a v5 handle is no longer enough, and the choice cannot flip mid-session.

Details
  • The flag falls back to false, so it is off unless remote config turns it on.
  • A later read that disagrees with the pinned value logs a warning and keeps the original decision.
Evidence

tengu_hover_rest read

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 v2.1.236 →