If your notes are plain markdown files (like this site), any AI coding agent can read them, which means you can interview your own vault.
Setup is one line:
npm install -g @google/gemini-cliThen cd into your notes folder, run gemini, and ask. The agent greps and reads your files by itself before answering, you can watch it search.
The fun is in the questions. Facts (“when did I start swimming?”) work, but the interesting ones are the mirror-questions: based on my notes, how am I like everyone else and how am I different? What are my strengths and blind spots? An AI with years of your diaries answers with receipts, it quotes you back to yourself. Somewhere between a personality test and an audit, and much cheaper than both.
Same trick works with Claude Code or any agent that can read files. The only real requirement: your notes have to be files you own, not locked in an app.