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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 v2.1.234 17 Aug 2026

Storage keys reject a reserved sidecar filename shape

Under the hood

Useful1 Signal2

Internals

Storage keys now reject a reserved hidden sidecar filename pattern alongside the existing bans.

What

Names used as storage keys are now refused if any path segment is a dot followed by sixteen hex characters and .aside, joining the existing bans on NUL bytes, slashes and dot-only names. The transcript-file listing reuses the same check.

Evidence

/^\.[0-9a-f]{16}\.aside$/

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

See this entry in the whole of v2.1.234 →