Your tools stay where they are

Every integration implements the same small interface, with three capabilities: observe (pull external state into Founder OS), sync (push canonical state back out), and health (report whether the connection is actually working). A tool that can only be read declares observe and health and nothing else, and the rest of the system knows not to try writing to it.

That uniformity is what makes the Company State Engine possible. The reconciler does not care that a project arrived from a Markdown vault rather than a database — it sees typed entities with provenance attached, decides they are the same project, and merges them into one. The write gate rejects updates it cannot support from the source, and decay surfaces the entity nothing has touched in weeks.

The practical consequence for you is that adding a tool never means re-learning the product, and removing one never strands your data. Mirrored content is ordinary content in the destination tool — plain Markdown files, ordinary database properties — readable with or without Founder OS running.

What is not connected yet

Nothing on this site describes a feature that does not exist. Today that means: Obsidian and Google Calendar are live, Notion is in progress with its OAuth connect flow already shipped, and everything else is unbuilt. If the tool you need is not listed, say which one — the adapter interface is small, and a real request from a real founder is how the queue gets ordered.