Why it matters
Measures Runtime Semantic Divergence at one decision and converts it into a signal that can drive a deterministic governance decision. SDI does not measure cumulative Agentic Workflow Drift.
Control relationship
Authorized meaning must remain connected to the meaning operationalized at runtime.
SDI measures Runtime Semantic Divergence in the control path Runtime Semantic State → SDI → V-RSR → Deterministic Gate.
Research translated into implementation
A published measurement framework with working Python code.
The Semantic Deviation Index is not only a conceptual construct. Its companion technical package provides a reference specification, working Python implementation, Deterministic Gate logic, adapters, and conformance materials.
Research paperSDI and Deterministic GateRead the formal measurement and control framework.
Citable implementationReference specification and Python implementationOpen the permanent Zenodo record and implementation package.
Open-source codeInspect and use the working repositoryReview the implementation, adapters, Gate logic, and conformance materials on GitHub.
Suggested citation: Doyle-Spare, M. (2026). Agentic AI Semantic Deviation Index - A Reference Specification with a Working Python Implementation. Zenodo. https://doi.org/10.5281/zenodo.21477665