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Sweep 30 Oct 2026 · 21:36Z Build v2.1.315 533 read Stable v2.1.308 Latest v2.1.314 Next v2.1.315 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.315 ·

Hidden option marks a session that began as a copy of another

A hidden --session-began-as-copy option, sent by the server, stops --resume from continuing the copied session's last turn

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JSON All of v2.1.315
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4Signal: worth watching, 1 to 5
SessionsArea: what it touches
New FeaturesKind: in v2.1.315,
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What

Claude Code has a new hidden command-line option, --session-began-as-copy, which the server sends. A value of 1 means the session began as a copy of another session. In print mode (running non-interactively and printing the result), --resume then:

  • does not continue the last turn of the session it was copied from
  • does not run a tool call that a hook (a user-defined script that runs at set points) put off in that session

It means the same as setting CLAUDE_CODE_SESSION_BEGAN_AS_COPY=1. The option is also on the list of options passed through alongside --attach-serve and --runner-declares.

Why

This is server-driven plumbing for copied or forked remote sessions. It is not a switch meant for people to set themselves.

Read from
Names in the bundle--resume
What the documentation says
--resume Claude Code changelog modified, high confidence * Improved `--resume` speed and memory use on damaged transcripts see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees--resume on Claude Code changelog

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