CROSS-CATEGORY: Distribution Is Moving From 'Launch an App' to 'Ship an MCP-Native API or Agent Plugin' Across Infra, Martech, and Commerce

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The same shape appears in three unrelated categories this week: Supabase ships an agent plugin (infra), Publora ships an MCP-native social API and Brandfetch a brand-context API for agents (martech/data), and dev.to practitioners describe 'MCP servers are the new SaaS' as a monetization model. The unit of distribution is becoming a tool an agent can call, not a UI a human logs into. Builders who expose clean, well-scoped MCP tools/APIs capture the agent traffic that used to require building and marketing a full product.