Sidekick: Local-first native macOS LLM app

The readme says:

> Give the LLM access to your folders, files and websites with just 1 click, allowing them to reply with context.

…

> Context aware. Aware of your files, folders and content on the web.

Am I right in assuming that this works only with local text files and that it cannot integrate with data sources in Apple’s apps such as Notes, Reminders, etc.? It could be a great competitor to Apple Intelligence if it could integrate with apps that primarily store textual information (but unfortunately in their own proprietary data formats on disk and with sandboxing adding another barrier).

Can it use and search PDFs, RTF files and other formats as “experts”?

anythingllm https://github.com/Mintplex-Labs/anything-llm

openwebui https://github.com/open-webui/open-webui

lmstudio https://lmstudio.ai/

One of the screen shots shows a .xlsx in the “Temporary Resources” area.

Also: I haven’t checked, but for a “Local-first” app, I would expect it to leverage Spotlight text importers from the OS, and run something like

  mdimport -t -d3 *file*

Somewhat related, one issue i have with projects like these is it appears like everyone is bundling the UX/App with the core ... pardon my ignorance, "LLM App interface". Eg We have a lot of abstractions for LLMs themselves such as Llama.cpp, but it feels like we lack abstractions for things like what Claude Code does, or perhaps this RAG impl, or whatever.

Ie these days it seems like a lot of the magic in a quality implementation is built on top of a good LLM. A secondary layer which is just as important as the LLM itself. The prompt engineering, etc.

Are there any attempts to generalize this? Is it even possible? Feels like i keep seeing a lot of good ideas which get locked behind an app wall and no ability to switch them out. We've got tons of options to abstract the LLMs themselves, but i've not seen anything which tackles this (but i've also not been looking).

Does it exist? Does this area have a name?