Function Choice Policy

Data artifactOrchestrationOrchestration & Toolsarc:FunctionChoicePolicy

A configuration artifact constraining which functions an LLM orchestrator may or must call: fully automatic, required invocation of specific functions, or filtering to selected capability domains.

Responsibility. Restricts the orchestrator LLM's function-routing freedom to trade flexibility for determinism.

Also known as: FunctionChoiceBehavior, Routing constraint, Plugin filter

Direct neighbourhood (hover for relationship types)

Relationships

constrains control

Function-Calling Controller Ch2.5

Design guidance

SHOULD require invocation of specific functions for compliance-critical operations.
SHOULD filter routing to relevant capability domains where predictability matters but specific function selection need not be forced.

Classification

Patterns: Auto function choiceRequired function invocationPlugin filtering
Technologies: Semantic Kernel FunctionChoiceBehavior
Quality attributes: Reliability (ISO/IEC 25010 | NIST AI RMF: valid and reliable)Transparency and accountability (NIST AI RMF: accountable and transparent)
Risks mitigated: Non-deterministic routing in regulated workflowsSkipped compliance-critical functions

Sources

Ch2.5: T. Nguyen, "Semantic Kernel," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 2.5. ISBN: 9798244538229.