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Sweep 10 Nov 2026 · 02:18Z Build v2.1.322 539 read Stable v2.1.311 Latest v2.1.322 Next v2.1.322 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.281 ·

Session resume / respawn plumbing

Internal replies used when starting, moving or resuming a session gain new fields such as freshSession and reattachEnvDropped

Under the hood Internal Changes
JSON All of v2.1.281
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SessionsArea: what it touches
Internal ChangesKind: in v2.1.281,
Internal ChangesSection of the release

Unclear The finding does not say what the leafUuid filter checks or whether any of the new fields change what a reader sees.

What

A session is one continuous conversation with Claude Code. Several internal replies that Claude Code uses when it starts, moves or resumes a session now carry extra fields:

  • freshSession in the reply to a change of working folder (set_cwd)
  • reattachEnvDropped in the result of starting a new session
  • sessionRoot in results that report the root folder of a git repository

The saved marker for where a resumed session picks up (leafUuid) is now set to the last message that fails a filter. Before, it pointed at a fixed message.

Why

These are behind-the-scenes changes. The one most likely to matter in practice is the leafUuid change, because it decides which message a resumed session treats as its latest.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding does not say what the `leafUuid` filter checks or whether any of the new fields change what a reader sees.

See this entry in the whole of v2.1.281 →

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