The Human–AI Ledger (HAIL) defines a structured, repeatable workflow for human–AI collaboration. Through standardized checkpoints and a session ledger, HAIL documents ethical, creative, and procedural context across both human and AI contributions. While AI-generated outputs are inherently non-deterministic, HAIL supports process reproducibility by providing a consistent framework for recording collaboration, facilitating auditability, transparency, and ethical accountability in co-creative AI sessions. The workflow comprises three normative phases: 1. Sign-On — Seed Block + Goal Statement initialization 2. Iterative Collaboration — standardized Checkpoint Prompts and summaries 3. Sign-Off & Validation — Final Reflection, Session Ledger compilation, validation Source: https://doi.org/10.5281/zenodo.17597705 License: CC BY 4.0 Author: Evan P. Troendle (ORCID: 0000-0003-4825-4088), Queen's University Belfast Schema: HAIL_Schema_v1.0.yaml