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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 v2.1.108

REPL Replay and Drift Detection

What

Infrastructure for replaying REPL code blocks after compaction to validate that execution produces consistent results.

Details
  • Extracts code blocks and tool calls from conversation history for replay
  • Caches tool call results to replay against
  • Detects nondeterminism: "likely nondeterminism (Date.now, Math.random) took a different branch"
  • Throws ReplayCacheExhausted when replayed code makes more tool calls than the original
  • Reports replay status: "N blocks replayed cleanly"
Evidence

Replay infrastructure (search for "REPL replay" and "ReplayCacheExhausted")

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 v2.1.108 →