migrate-oai-app

Migrate existing OpenAI Apps SDK applications to the MCP Apps SDK ( @modelcontextprotocol/ext-apps ). The MCP Apps SDK provides a standardized, open protocol for interactive UIs in conversational clients. Clone the SDK repository for complete migration documentation and working examples: Read the migration reference guide with "before/after" mapping tables: /tmp/mcp-ext-apps/docs/migrate_from_openai_apps.md Read JSDoc documentation directly from /tmp/mcp-ext-apps/src/* : See /tmp/mcp-ext-apps/examples/basic-server-{framework}/ for basic SDK usage examples organized by front-end framework: MCP Apps HTML is served as an MCP resource, not as a web page, and runs in a sandboxed iframe with no same-origin server. Every origin must be declared in CSP—including the origin serving your JS/CSS bundles ( localhost in dev, your CDN in production). Missing origins fail silently. Before writing any migration code , build the app and investigate all origins it references: Document your findings as three lists, and note for each origin whether it's universal, dev-only, or prod-only: If no origins are found, the app may not need custom CSP domains. MCP clients make cross-origin requests. If using Express, app.use(cors()) handles this.