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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

Claude Code v2.1.260 ·

Turn-lifecycle event hooks added to session loop

The session loop now emits turn-start and turn-step lifecycle markers.

Under the hood Internal Changes
JSON All of v2.1.260
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Headless SDKArea: what it touches
Internal ChangesKind: in v2.1.260,
Internal ChangesSection of the release

The headless session loop now emits turn.start and turn.step lifecycle markers as messages are processed, recording turn events for later use such as intent forwarding's turnEvents.

Read from
Names in the bundleturn.startturn.step
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up turn.step, on React to events with a mod. A turn is everything Claude does in answer to one prompt. Handle `turn.start`, `turn.step`, and `turn.complete` to follow one: plugins/mods/events see the edit
Confirmed since Anthropic's documentation has since written up turn.start, on React to events with a mod. A turn is everything Claude does in answer to one prompt. Handle `turn.start`, `turn.step`, and `turn.complete` to follow one: plugins/mods/events see the edit
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up turn.start, on React to events with a mod.

See this entry in the whole of v2.1.260 →

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