Workflow: Weekly schedule trigger → reads query list from Google Sheet → 4 parallel HTTP Request nodes (GPT-4o via OpenAI API, Claude via Anthropic API, Perplexity API, Gemini via Google API) → Code node checks each response for target company name and domain matches → writes to Sheets tracking tab (query, model, company cited yes/no, position, date). Weekly execution builds a rolling trend: citation frequency increasing, decreasing, or stable per model and query. The complete workflow is the Omni AI Visibility Engine demonstrated at omnionlinestrategies.com/ai-discoverability-demo.