LangChain's EU AI Act Feature Request Already Has an Answer — and It's a 13-Line Callback Handler

On April 2 2026 an external contributor filed LangChain issue #35357: "Feature: Structured compliance audit logging for EU AI Act (Article 12)." The request was specific: a ComplianceCallbackHandler that captures execution traces, inputs/outputs, model identifiers, timestamps, human oversight decisions, and risk classifications as structured, tamper-evident logs — the things Article 12 of the EU AI Act requires high-risk AI systems to log automatically. The issue is closed. No maintainer comme...