How Jev Tool Helps Google ADK Agents Catch Content Errors Beyond Schema Validation

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A developer demonstrated that JSON schema validation alone cannot detect content-fit issues, such as a lengthy caption assigned to a short video segment. Using a four-segment storyboard, the experiment showed that ignoring a tool called Jev's warnings resulted in rushed narration and mid-sentence scene cuts. The article explains that Google's Agent Development Kit (ADK) offers more than schema-valid JSON output — its core value lies in agent orchestration, tool use, and autonomous decision-making. By wrapping Jev as an ADK tool, the director agent was able to self-check each segment and regenerate captions that did not fit their allotted duration. This is the first part of a three-part series exploring the gap between schema correctness and content correctness in AI-generated video timelines.

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