Microsoft’s open trust stack runs on OpenInference

At Microsoft Build, Sarah Bird announced the open trust stack for AI agents, centered on two open-source projects: ASSERT and Agent Control Specification (ACS), both built on OpenInference, the OpenTelemetry standard for AI applications by Arize. ASSERT serves as an evaluation framework that uses spec-driven testing to assess AI agent behavior, while ACS provides a standard for runtime controls, allowing developers to implement safety measures throughout an agent's lifecycle. Both systems use OpenInference, enabling a shared telemetry layer that integrates evaluation, controls, and observability through a unified trace contract. This architecture allows for comprehensive visibility into AI operations, ensuring that evaluation processes are informed by complete execution paths rather than just final outcomes. OpenInference facilitates seamless integration across various frameworks without necessitating code changes, supporting robust governance and observability of AI agents in production environments.

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