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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Transcript store fence is wired but nothing in this build can trip it

Not switched on
Useful2 Signal4
Sessions

A latch can make a session stop writing its transcript, but nothing can trip it here.

The fence arms only on a StoreFenced error that no code in this build creates.

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 v2.1.248: on

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

The transcript writer has a new latch that, once armed, makes the session stop writing its transcript entirely: appends and queue drains rethrow, session metadata re-append returns early, and the compaction backstop is skipped. It arms only on a write error tagged with the new code StoreFenced, and nothing in this build creates such an error.

Details
  • The StoreFenced string appears once, at its declaration; the predicate testing for it has only readers, no producer.
  • An emitter would have to come from the storage backend, which is loaded from a dynamically required chunk and only runs under storage v5, itself behind tengu_hover_rest with a fallback of off.
  • Neither the field nor the constant exists in v2.1.247.
Evidence

StoreFenced

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

See this entry in the whole of v2.1.248 →