SDI protocol defines a reasoning computer for AI. The computer runs an LLM one turn at a time, guiding it through a reasoning grammar; the grammar, which is both natural language and algebraic, allows it to be checked at a compile gate. The gate validates safety, a workfloor, and alignment with the grammar before it commits. What commits is a hash-chain ledger of the agent's reasoning, forming a longitudinal data set that becomes the agent's functional memory/system state. Chromite, the protocol...