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core beginner

Emit Directive Agent

Focused example showing how actions emit domain events while still updating agent state in one step.

signals directives emit core-mechanics l1

Related guides and notebooks

Concept
Directives
Review built-in directives and effect modeling.
Concept
Signals
Understand signal structure and dispatch.
Next
Build your first workflow
Combine emits into multi-step workflows.
Livebook
Build your first workflow
Run the companion notebook in Livebook
Explanation

What this example teaches

Interactive Demo

Run the agent and inspect state

Source Code

Read the production implementation

What you’ll learn

  • How %Directive.Emit{} publishes domain events.
  • How state updates and emitted signals can happen in one action.
  • How to inspect emitted signals from a real runtime.

How it works

create_order updates orders state and emits order.created. process_payment updates last_payment and emits payment.processed. multi_emit demonstrates a list of emit directives in a single action.

call behavior

The demo sends signals through AgentServer.call/2, then renders:

  • Updated agent state
  • Captured emitted signals
  • A simple execution log