openplatform-host-generative-ui-init

Integrate FinamX generative UI into ANY project's chat or agent surface: find the chat (useChat/streamText/ createMCPClient/custom SSE), connect the platform MCP (mcp-catalog :3100/mcp, Bearer host token + X-User-Id), add the model instructions (extension.list/get/schema/install/present, compose, graph.*, get_host_domain), and render tool results in the chat: registry extension via Launch + host-bridge, agent HTML/DivKit iframe, several linked extensions on one shared PubSubBroker, optional MCP Apps (present_*, ui://). Also: expose the host's FinamX extensions to EXTERNAL chat clients (Claude.ai, ChatGPT) as MCP Apps through the host's own MCP server + OAuth 2.1 (relay of the platform MCP). Use when a host wants agent-driven UI in a chat (its own or a third-party one). Not for base embedding (openplatform-host-init) or authoring (openplatform-ext-init).