langchain-ai/langchainjs @langchain/core@1.2.20

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Patch Changes

• #11922 d71c542 Thanks @richardscarrott! - feat(core): add midConversationSystemMessages and midConversationTools to ModelProfile. They say whether a chat model sends a system message after the first turn in place, and whether it can add a tool through a message rather than the request's tool list. Either way the prompt prefix before it stays unchanged.