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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 v2.1.248

Clearer error when a replayed REPL run outruns its cached tool calls

You'll notice
Useful2 Signal2
Elsewhere

Replayed REPL runs that make extra tool calls now fail with a clear nondeterminism error.

What

Replaying REPL code that makes more tool calls than the original run recorded now fails with a ReplayCacheExhausted error that points at nondeterminism as the likely cause.

Details
  • The message names Date.now and Math.random as typical culprits for taking a different branch on replay.
Evidence

likely nondeterminism (Date.now, Math.random) took a different branch.

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 v2.1.248 →