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Sweep 29 Sep 2026 · 18:10Z Build v2.1.285 506 read Stable v2.1.280 Latest v2.1.285 Next v2.1.285 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.280 ·

Attach vs. create sessions get different "opening initialize honours" sets

Attaching to an existing headless session now honours a caller-supplied list instead of always getting an empty one

Under the hood Internal Changes
JSON All of v2.1.280
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Session ManagementArea: what it touches
Internal ChangesKind: in v2.1.280,
Internal ChangesSection of the release
What

Claude Code can open a headless session (one run without the interactive UI) either by creating a new session or by attaching to one already running. Internally, opening a session applies a set of "opening initialize honours", settings that get applied when the session starts. Previously, attaching to a session always passed an empty set of these, so none applied. Now the code that opens a session takes an attachHonours parameter: a brand-new session still always uses a fixed set, but attaching now uses whatever attachHonours the caller supplies.

Why

This lets attaching to an existing session carry over initialize settings that were previously always dropped, so behavior on attach can now depend on what the caller passes rather than always starting from nothing.

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 settings are in the `t1n` list or what values callers pass for `attachHonours`, so the practical effect on…

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