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core beginner

Plugin Basics Agent

Focused example showing plugin mount state, plugin signal routes, and plugin-owned state updates.

plugins composition signals coordination l1

Related guides and notebooks

Concept
Plugins
Understand plugin state, hooks, and route composition.
Concept
Signals
Review signal dispatch to plugin routes.
Next
Plugins and composable agents
Build larger systems from composable plugins.
Livebook
Plugins and composable agents
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 plugin mount/2 initializes plugin-owned state.
  • How plugin signal_routes contribute handlers to the agent.
  • How plugin actions update a plugin state slice.

How it works

The NotesPlugin owns the :notes state key and exposes two routed signals:

  • notes.add
  • notes.clear

The LiveView sends these signals through AgentServer.call/2 and renders the plugin state after each call.