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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 v2.1.55 ·

Streamlined session ID generation

Entry
JSON All of v2.1.55
EntryKind: in v2.1.55,
ChangesSection of the release

Internal session identifiers (used for log files and remote agent tracking) now use UUID-based generation instead of custom random-byte character sampling. IDs are slightly shorter (6 hex characters from a UUID vs 8 base-36 characters from random bytes). Remote agent sessions now derive their ID directly from the parent session ID (search for "remote_agent") rather than generating an independent random ID, which improves traceability during debugging.

Evidence

Removed charset "0123456789abcdefghijklmnopqrstuvwxyz" (2 of 4 instances removed), replaced with randomUUID substring approach (search for replace(/-/g, "").substring(0, 6)).

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

See this entry in the whole of v2.1.55 →

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