Halo-record: Open-source audit trails for AI agents Brian Kuan wrote halo-record, a small Python package that sits inside an AI agent and writes down the moves it makes: tool calls, model calls, data access, approvals. Each action becomes one line in a file that only ever gets appended to, and every line carries a hash of the line before it, a hash being a short fingerprint computed from content. Edit a record later and every fingerprint after it stops matching. The code is open source, and anyone can run that check with no key, no account and no permission from the vendor whose agent produced the log. A customer’s security team asks what your agent did with their data, and the answer they get is a paragraph you wrote about yourself. A hash-chained log replaces the paragraph with a file…