Meta gave Claude and ChatGPT full write access to its ad system today. Google's official Ads MCP, shipped earlier this year, is read-only by design. Both companies looked at the same protocol. They reached opposite conclusions about who should hold the keys. Google Ads runs on keyword auctions. Every dollar of revenue depends on advertisers picking the right keyword, the right match type, the right bid. The configuration surface is the moat. An AI agent freely modifying bids and pausing…