function-calling

LLM Function Calling: Plan, Extract Call, Execute, Synthesize

The LLM plans which function to call, the agent extracts the function call (checking llmOutput.containsKey("functionCall")), executes it via a switch statement mapping function names to results (e.g., price lookups), and the LLM synthesizes the answer from the function output.

Workflow

userQuery, functionDefinitions
  -> fc_llm_plan -> fc_extract_function_call -> fc_execute_function -> fc_llm_synthesize

Workers

LlmPlanWorker (fc_llm_plan) -- Uses Pattern/Matcher to plan the function call.

ExtractFunctionCallWorker (fc_extract_function_call) -- Validates functionCall key exists in LLM output; defaults to "unknown" if missing.

ExecuteFunctionWorker (fc_execute_function) -- Uses a switch expression to dispatch by functionName.

LlmSynthesizeWorker (fc_llm_synthesize) -- Checks for functionResult.containsKey("price") to build the answer.

Tests

49 tests cover planning, extraction, function dispatch, and synthesis.

Further Reading

• RUNNING.md -- how to build and run this example