Show HN: Halo – open-source, tamper-evident runtime evidence for AI agents

Halo is an open-source tool providing tamper-evident runtime records for AI agents. It creates an append-only, hash-chained log of agent actions, allowing any party to verify the log's integrity without trusting the producer. This helps answer security questions about agent behavior with verifiable reports instead of written assurances. Halo is designed for easy auditing, has zero runtime dependencies, and avoids network calls or storing raw input data. It supports various agent frameworks and offers a "witness" feature for completeness verification.