langchain-ai/langchainjs langchain@1.2.20

on GitHub

Patch Changes

• #9983 ea7e791 Thanks @encodedz! - Support concurrent agentNode dynamic prompts properly.

• #9986 8a52dad Thanks @brettshollenberger! - Don't re-emit input state from middleware hooks that return void

• #9982 4558fa6 Thanks @hntrl! - feat(langchain): add optional tools parameter to countTokensApproximately for more accurate token estimates when tools are bound to a model

• #9981 5f28338 Thanks @hntrl! - feat(agents): support returning Command from wrapModelCall middleware

  Allow wrapModelCall middleware hooks to return Command objects for advanced
  control flow (routing, state updates), matching the existing wrapToolCall
  pattern. The framework tracks the effective AIMessage through the middleware
  chain so outer middleware always receive an AIMessage from handler(), even
  when an inner middleware returns a Command.

• Updated dependencies [d5e3db0]:

  • @langchain/core@1.1.21