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Sweep 06 Nov 2026 · 01:32Z Build v2.1.319 537 read Stable v2.1.311 Latest v2.1.318 Next v2.1.319 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.277 ·

Session/checkout ID format tightened to a strict UUID regex

Device attestation status now validates session/checkout IDs as strict UUIDs

Under the hood Internal Changes
JSON All of v2.1.277
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
AttestationArea: what it touches
Internal ChangesKind: in v2.1.277,
Internal ChangesSection of the release
What

A constant used in device attestation status checks, which previously matched an ID by string prefix, is replaced with a strict regular expression that only matches a properly formatted UUID (a standard 36-character identifier format).

Why

This makes the check stricter: an ID has to be a well-formed UUID to pass, rather than merely starting with the right prefix, which should reduce the chance of a malformed or spoofed ID being accepted.

See this entry in the whole of v2.1.277 →

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