First public docs
- Buying: one brief to every eligible seller, streamed proposals with refinement, staged media buys and a confirmed launch. See Buy media. - Selling: storefronts with a hosted storefront agent, AI Business Rules with two approval gates, the demand inbox and the proposal pass. See Sell media. - Agents: the v3 MCP endpoint, with widgets that render in the Semicola app and in MCP Apps hosts such as Claude and ChatGPT. See Build with Semicola.