Model Context Protocol — Anthropic's standard for connecting tools to Claude (and increasingly other agents). Ravish Agrawal's Claude AEO lever: ship an MCP server and live in the ecosystem, because Claude cites ~5× less than ChatGPT and will not acquire users by discovering your MCP. Remote OAuth install now looks like old "Connect with Facebook." Thesis: Claude behaves like a Play Store; MCP is the listing, not the search ad.