How I use Obsidian as my AI's memory
Every work session starts the same way: I run one command and my AI reads back exactly where I left off last time. What shipped, what's open, what to do next. It reads that out of my notes. The vault isn't for me to reread. It's the memory my tools work from.
Most note apps are where ideas go to die. You write something, feel productive, and never open it again. My vault earns its keep because something acts on it the next morning. The trick isn't the notes. It's that they live as plain text my AI can read and write.
1. The structure is boring on purpose
The whole vault is plain folders, named so there's one obvious place for everything: Inbox, Projects, Areas, Resources, Writing, Daily Notes, Archive, Meta. Every project gets the same shape inside: a main note, a Log, a Decisions Log, a Prompts folder. It's deliberately predictable. When everything has one home, neither I nor an agent has to guess where a thing goes or where to find it.
2. The vault is readable and writable by Claude Code
Here's the unlock. Because the notes are plain markdown in a folder on disk, Claude Code can open and edit them directly. That turns a few small commands into a memory layer that spans sessions:
- session-start reads the last handoff so I resume in seconds instead of re-reading my own code.
- session-end writes the handoff: what shipped, what's still open, what to do first next time.
- email-route pulls the morning's email and drops the real action items into today's note.
- decision-log records a decision and the option I didn't take, so I don't relitigate it in three weeks.
- daily-recap / weekly-review roll the work up and attribute it to the things I'm trying to move.
None of these are clever. They're short instructions that read and write markdown. The vault is what makes them add up.
3. The daily loop
Strung together, an ordinary day looks like this:
- Morning: route the inbox, so today's note opens with what actually needs doing.
- Each work session: start by reading the handoff, do the work, end by writing the new handoff. That last step is the one that matters. It's why the next session begins already oriented.
- As decisions happen: log them, with the road not taken.
- End of day or week: recap, and see where the time actually went.
4. Search that works by meaning
On top sits Smart Connections, which indexes the vault as embeddings. So instead of hunting for the exact word I used months ago, I can ask for what I've been working on near a topic and get related notes back by meaning. When a thread spans weeks, that's the difference between finding the old note and forgetting it existed.
The point
A folder of notes is storage. A vault your AI reads and writes is a system that remembers for you. Same app, same markdown files. The difference is that something picks them up the next morning and hands you back your own context.
The vault stopped being where I put things to forget them. It became the thing that remembers.
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