AI Harness is for the point where AI stops being an experiment and starts touching work that has owners, budgets, risks, and audit trails.
The core move is simple: do not let the model provider become the architecture. Put the agent runtime inside the enterprise application boundary. Keep the model call behind adapters. Keep tools explicit. Keep workflows typed. Keep approvals, state, traces, and evals close to the business process.
Agents handle the model-driven loop: prepare messages, call a model, execute tools, continue until a validated output exists, and emit run events. Workflows handle the surrounding business process: sequence agents, branch, parallelize, apply deterministic logic, request review, write artifacts, and persist state.
That gives decision makers a path from AI prototype to enterprise platform: provider choice remains open, tool execution is controlled, outputs are validated, review gates are visible, and operational evidence exists without turning prompts and customer data into accidental log retention.