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open_advertisers_page launches Advertisers — the buyer starting point. The Page lists every advertiser on the account with its campaign and draft counts, its brand identity, and one next action, and opening a row switches into that advertiser’s Campaigns Page. ”+ Add advertiser” launches the Advertiser Setup Task. It is a widget launcher: the tool takes no arguments, returns the shared MCP App directive for ui://agentic-api/all-advertisers-home/mcp-app.html, and the Page self-fetches its landing projection through the app-only V3 get_buyer_advertisers_page tool. Nothing about the advertisers enters model context. It is buyer-only and read-only.

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From an agent (MCP)

Ask in natural language — “show my advertisers”, “list advertisers”, or “where do I start” — and the agent calls the tool on /mcp/v3:
The result carries content (Opened Advertisers Page.), an empty structuredContent, and the resource directive. A host that renders MCP Apps opens the Page; any other host receives the text.

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Text answers

For an answer in words rather than a Page — a count, a name, a status — use search(kind: "advertiser") and get(kind: "advertiser", id) instead. The launcher never recites the list.

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Errors