Native iOS framework integration for apps sdk

Does anyone know if it’s possible to build an apps sdk app that integrates with local iOS frameworks?

I want to build what Anthropic has built with their native iOS app and integration into the native Apple Reminders app.

Thoughts?

For Apple Reminders integration specifically, remi (github mattheworiordan/remi) provides an MCP server that any MCP-compatible AI agent can use. Supports the full Reminders API including sections with iCloud
sync. remi --mcp starts the server over stdio. I recently published it because I needed it, hoping it helps with your ask! Feedback very welcome.