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.

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Compare-and-swap retry helper for versioned storage keys

Under the hood
Useful1 Signal2
Storage Backend

Internal plumbing lets concurrent writers update shared state without clobbering each other.

A compare-and-swap retry helper and a namespace classifier exist, marking task, team and identity data as versioned; nothing user-facing calls it.

What

An internal helper read-modify-writes a storage key with ifMatch/ifAbsent preconditions and retries with backoff when the precondition fails, so concurrent writers do not clobber each other.

Details
  • retries on PreconditionFailed and AlreadyExists with backoff
  • refuses keys whose namespace is classified 'plain' (last-writer-wins) and returns an InvalidArgument error naming the offending argument
  • a new namespace-discipline classifier marks task, team, identity and plain globalConfig as versioned; settings, memory, cache, state, job and userConfigDir are plain
Evidence

casRetry arbitrates versioned keys only

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 v2.1.223 →