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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.248 ·

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

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

You'll notice Improvements
JSON All of v2.1.248
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
ImprovementsKind: in v2.1.248,
ImprovementsSection of the release
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.

See this entry in the whole of v2.1.248 →

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