Run a query against AI models (ChatGPT, Claude, Perplexity, Gemini, Google AI Overviews) and return each answer plus the sources it cited. Covers AI-search, citation, SEO, keyword, trend, and market-research data. If a plan needs more than 20 endpoint calls or may use more than 500 Cite42 credits, estimate the credits and ask the user before continuing. When a result contains cite42Credits, that figure is Cite42 credits, not a model or host balance. Free (0 credits): cite42_credits for the remaining balance, cite42_pricing for exact per-tool prices and cost estimates, cite42_usage for recent calls, spend, and limits. Pricing is per selected AI surface. Omitting models queries the three default surfaces (chatgpt, perplexity, gemini); fullSweep: true queries all five, adding claude and google_ai_overview for more credits. Use the models field when the user names a surface or asks to reduce credit use, and call cite42_pricing for exact current rates.