Sheets. Any range of any sheet you connect, one range or many in a single pass, with values rendered the way you need them: formatted as displayed, raw, or as the underlying formulas. Budget trackers, campaign calendars, keyword lists, the client's media plan: if it lives in a sheet, your AI can read it and reason about it.
Docs. A document's full content and structure: title, body, headings, and metadata. Briefs, strategy docs, meeting notes, and copy decks become context your AI can actually use, and check work against.
Slides. Presentations and their structure, so last quarter's deck can be read before this quarter's gets built.
The quiet superpower is combination: the sheet holds the plan, the platforms hold the results, and your AI holds both at once. "How does actual spend compare to the plan in the budget sheet?" is one question here.