Homey Pro - Smarthouse integration with LLM

This n8n workflow sets up a smart home assistant using OpenAI and Homey integration. It uses LangChain agent tools to allow natural language queries (in Norwegian) to trigger workflows for controlling lights, curtains, temperature, TVs, and other devices across different rooms (e.g., living room, bedroom, cinema). The system uses tool-based workflows connected to specific smart home actions and responds in Norwegian. It’s designed to be modular and easily extended with new devices or capabilities.

Help me set up the n8n workflow "Homey Pro - Smarthouse integration with LLM" (https://n8n.io/workflows/4058). It uses: AI Agent, OpenAI Chat Model, Call n8n Workflow Tool, xAI Grok Chat Model. Import the template JSON into my n8n instance, list every credential I need to create, and walk me through testing it.