Second Brain

Stand up and maintain a markdown wiki an agent keeps for itself — one that loads progressively and stays bounded no matter how large it grows.

The model in one paragraph

A finite attention budget means you cannot load the whole knowledge base every session, so split it with a single loading boundary. Eager (loaded every session): a thin index.md that maps the wiki, plus the recent window of journal.md. On demand (pulled only when a link is followed): the source catalog.md, everything under raw/ and pages/, and the sealed archives under log/. The eager set is small and fixed; it does not grow as the wiki grows, because the index links to content instead of inlining it. That boundary is the whole idea — everything below serves it.

When to use this