Why it matters

Function calling is core agent pattern. Understanding shapes robust agents.

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The architecture

Register: schema + Java implementation.

LLM decides + generates args.

Executor: run function, return result.

Function calling flowRegisterschema + methodLLM invokesgenerates argsExecutereturn resultJava: annotations + reflection generate schema from method signature
Function calling.
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How it works end to end

Schema derivation: from method signature (annotations).

Argument binding: Jackson.

Execution: reflection or explicit dispatch.

Result: back to LLM.