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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
Claude Code v2.1.257 ·

New context-injection event types: prefix_delta, fork_briefing, remote_session_change, async_hook_response_batch

The context renderer handles new synthetic events for prefix deltas, fork briefings and remote session changes.

TierUnder the hoodhow much it should matter to you
Useful3my rating, 1 to 5
Signal4worth watching, 1 to 5
AreaSessionswhat it touches
KindInternal Changesin v2.1.257,
Under the hood No documentation found

The context renderer handles new synthetic events for prefix deltas, fork briefings and remote session changes.

The conversation-context renderer now handles several new synthetic event kinds: prefix_delta and fork_briefing, both of which inject meta text content, and remote_session_change, which only renders when the IAe() gate passes. async_hook_response_batch is now explicitly treated as a no-op.

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Names in the bundleprefix_deltafork_briefingremote_session_change

See this entry in the whole of v2.1.257 →

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