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Code Diffs Alone Miss Behavioral Changes in AI Agent Systems, Developer Warns

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A software developer maintaining AgentInspect, an open-source TypeScript toolkit, argues that traditional code diffs are insufficient for reviewing AI agent changes. Even a minor prompt edit can alter an agent's tool selection, execution path, and runtime duration in ways a source diff cannot capture. The developer proposes pairing code review with behavioral diffs — comparisons of recorded agent run traces — to identify where two executions actually diverge. AgentInspect's CLI tool can compare local run IDs and flag differences in step structure, run status, and duration, pinpointing the first divergence as a starting point for investigation. The approach treats behavioral diffs as an input to human review rather than an automated verdict, requiring interpretation alongside the original source changes.

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