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Sweep 22 Sep 2026 · 17:19Z Build v2.1.280 501 read Stable v2.1.267 Latest v2.1.280 Next v2.1.280 Feeds RSS JSON llms.txt Unofficial
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Headless cloud sessions gain a serve-only mode

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Headless cloud session create/attach now support a serveOnly option that reduces the active feature set

TierUnder the hoodhow much it should matter to you
Useful1my rating, 1 to 5
Signal1worth watching, 1 to 5
AreaCloud Sessionswhat it touches
KindInternal Changesin v2.1.265,
Group of 3 Under the hood No documentation found

Headless cloud session create/attach now support a serveOnly option that reduces the active feature set

What

The headless cloud-session bootstrap path (used when running the CLI to create or attach to a session on Anthropic's cloud) now supports a serveOnly option:

  • The create path calls a renamed runHeadlessCloudCreate function and passes { serveOnly: C.serveOnly } into runHeadlessCloudAttach.
  • A new session-opener path with entry: "attach" accepts the serveOnly option, and when set, swaps in a reduced feature set instead of the normal full feature set.

Why

This gives a way to attach to or create a headless cloud session with a minimal, serve-only feature set rather than the full normal feature set.

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Names in the bundleserveOnly
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 doubtWhat `serveOnly` mode actually restricts or enables, and how a user sets it, is not stated in the finding.

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