Why it matters

LangChain4j tools enable function calling. Understanding shapes agent design.

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The architecture

@Tool on method.

@P descriptions on params.

AiServices wires to model.

LangChain4j tools flow@Tool methodJava codeSchema derivedfrom signatureLLM invokeswith argsReflection derives schema; annotations describe; automatic bind on call
Tools.
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How it works end to end

@Tool: describes tool.

@P: describes param.

AiServices auto-registers.

Manual tool spec available.