Determinism through Structure

You cannot control what an LLM outputs (the text). You can control where that output goes (the flow).

Structural Constraints

By designing a graph, you are creating a "Guardrail of Logic".

graph TD
    Write[Write Code] --> Test[Run Tests]
    Test -- Fail --> Fix[Fix Code]
    Fix --> Test
    Test -- Pass --> Deploy

Example: You want an agent to write code.

• Unstructured: "Write code." (LLM might write code, or explain code, or refuse).
• Structured Graph: The graph forces the system to try to run the code. The LLM has no choice but to participate in this testing loop.

The Pit of Success

Good graph design creates a "Pit of Success"—a system where it is naturally difficult to fail because the structure guides the execution back to valid paths.