This podcast tutorial demonstrates building a custom plugin for the Eliza AI Agent framework, integrating the NASA API. The speaker guides listeners through creating the plugin from scratch, covering project setup, file creation (package.json, tsconfig.json, etc.), and coding the plugin's two main actions: retrieving Mars rover photos and the Astronomy Picture of the Day. The process involves using TypeScript, installing dependencies, and configuring environment variables for API access and AI inference (using Hyperbolic). Listeners gain a practical understanding of plugin development for AI agents and can use the provided code resources to build their own plugins.