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Canonical AI event

LangChain 1.3.0 streams tool-call arguments as delta slices.

Streaming tool-call arguments now use tool-call-delta events, reducing data size for large tool calls.

22 Oct 20261 verified claims1 sources1 observations
What happened

The official source reports this update: @langchain/core@1.3.0. Minor Changes #11986 2caf64d Thanks @richardscarrott ! - feat: stream tool-call args as tool-call-delta slices Tool-call and server-tool-call args now stream as tool-call-delta events, which carry only the new slice of the args, instead of block-delta snapshots of the args so far. A large tool call now costs about the same bytes on the wire as the same length of text.

Why it matters

This official update documents a development concerning @langchain/core@1.3.0. Its practical significance depends on the scope and evidence stated by the source.

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Read the official source update and verify its stated scope, evidence and timing before acting on it.

Connected knowledge

Entities affected by this event

Langchainjssubject
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Evidence trail

Sources behind the event

LangChain.js official releases@langchain/core@1.3.0
Editorial presentation

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