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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 v2.1.281 ·

SDK/headless startup coordinator gains new hooks

The SDK and headless startup coordinator takes new inputs for session-start hooks, pending SDK MCP servers and SDK entry waits

Under the hood Internal Changes
JSON All of v2.1.281
Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SDKArea: what it touches
Internal ChangesKind: in v2.1.281,
Internal ChangesSection of the release

Unclear The finding does not say what these inputs change about startup for someone using the SDK.

What

The startup coordinator, the part that orders startup work when Claude Code runs headless (without its interactive screen, often driven by a program through the SDK), now takes takeClaimSessionStartHooks, sdkMcpServersPending and noteSdkEntryWait. It also tracks serversStartedSinceKick.

Why

This is internal startup plumbing for programmatic use of Claude Code. The finding shows the new inputs but not how startup behaves differently.

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 these inputs change about startup for someone using the SDK.

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