Brain

A personal knowledge engine where the model only proposes and code checks and writes, rendered into an Obsidian vault.

Knowledge engineIn daily use104 tests

104 tests pass

Problem

AI note systems let the model write freely, which lets invented facts and broken links into your notes.

My role

Solo builder: ingestion, validation rules, a privacy filter, the Obsidian export and daily-note capture.

Shipped

A CLI engine and the vault it writes.

Stack

• Python
• Claude Code CLI
• Obsidian (Markdown and Bases)
• git

Outcome

• Evals run against an invented owner, so the test data holds nothing personal
• A privacy test fails on any excluded term