Set `ANTHROPIC_API_KEY` in the Portainer stack environment to enable real AI chat:
1. In the stack editor, add under **Environment variables**:
-`ANTHROPIC_API_KEY` = your Anthropic API key (starts with `sk-ant-api...`)
2. Redeploy the stack
Without this key, chat shows a "not configured" error. The key is passed to the `neode-backend` container which proxies requests to `api.anthropic.com`.