Follow Discord
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 $.model.fork plugin hook API forks the warm main-thread transcript

Plugins can call model.fork to ask a question against the live transcript, with no tools and a two-turn cap.

TierUse it nowhow much it should matter to you
Useful5my rating, 1 to 5
Signal4worth watching, 1 to 5
AreaPluginswhat it touches
KindNew Featuresin v2.1.257,
Use it now Notable No documentation found

Plugins can call model.fork to ask a question against the live transcript, with no tools and a two-turn cap.

A new plugin hook-API operation, model.fork, lets a plugin spawn a sub-query that forks the live main-thread transcript instead of starting a fresh agent context. The forked call strips trailing tool_use blocks, disallows tool use entirely (failing with "A model fork cannot use tools"), caps the fork at 2 turns, and reserves a 24000-token budget per call. If there is no warm main-thread transcript to fork from, the operation declines quietly with a debug log rather than throwing an error.

Read from
Names in the bundlemodel.fork

See this entry in the whole of v2.1.257 →

Feedback