Orchestration · Software component
Transition Router
Software componentOrchestrationOrchestration & ToolsVariation point (abstract)arc:TransitionRouter
A decision component that evaluates current workflow state against the logic tree to select the next node, tool, or sub-agent to execute.
Responsibility. Selects the next workflow operation from current state.
Also known as: Logic Tree Evaluation, Logic tree evaluator, Conditional edge
Variants
| Variant | When to choose |
|---|---|
| Hybrid Transition Router | Choose when LLM reasoning about the next step must be constrained by explicit rules. |
| LLM Transition Router | Choose when deciding what to do next requires reasoning, e.g., tasks without predetermined solution paths. |
| Rule-Based Transition Router | Choose when decision logic can be expressed as explicit rules over state fields. |
Relationships
is invoked by dependency
- Workflow Orchestrator abstract Ch1.5A Ch1.5B
reads dependency
- Working Memory Buffer abstract Ch1.5A Ch1.5B +1
routes to dynamic
- Replanner abstract Ch1.6
- Tool Executor Ch1.5A
- Worker Agent abstract Ch1.5A Ch1.6
Design guidance
- MUST be deterministic given identical state so that workflow execution remains predictable and debuggable.
- SHOULD be unit-testable independently of node implementations using controlled state inputs.
Classification
- Patterns
- Logic treeConditional routing
- Technologies
- LangGraph conditional edges
- Quality attributes
- Maintainability (ISO/IEC 25010)
Sources
- Ch1.5A: T. Nguyen, "Stateful Orchestration - Introduction and Core Concepts," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 1.5A. ISBN: 9798244538229.
- Ch1.5B: T. Nguyen, "Stateful Orchestration - Worked Examples," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 1.5B. ISBN: 9798244538229.
- Ch1.6: T. Nguyen, "Stateful Orchestration - Pitfalls, Integration, and Synthesis," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 1.6. ISBN: 9798244538229.
- Ch2.2: T. Nguyen, "LangGraph," in Mastering Agentic AI Systems: Guide for the NVIDIA NCP-AAI Exam, 1st ed. 2026, ch. 2.2. ISBN: 9798244538229.