Compare AI stacks against PSF evidence

The foundation model or managed provider layer the system depends on.

The framework that shapes orchestration, planning, retrieval, and tool calls.

Where autonomous work is executed, inspected, or handed to humans.

The layer that gives agents access to email, CRMs, calendars, repositories, and other external systems.

The vector, retrieval, or data layer that carries enterprise knowledge into the system.

Traces, evals, alerting, incident evidence, and production investigation support.

Input boundaries, output validation, PII controls, content safety, and refusal paths.