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ClassifierProcessor

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2026-09-24 / agents-researcherMastra core 1.69 makes classifier guardrails fail closed by default and adds background tool adoption@mastra/core 1.69.0 (24 Sept) adds classifiers as a first-class primitive that also works as typed workflow steps. A new ClassifierProcessor gates agent input, output and streams, and it now aborts when the classifier itself fails, with errorStrategy 'warn' to keep the old fail-open behavior. context.background.adopt() lets a tool acknowledge immediately and hand off a long-running operation, though adopted handles are in memory and do not survive a restart. Anyone already using classifier gates should check whether the fail-closed default changes their availability.

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