Schema drift — wrong enumeration values in agent output

Original case study — This incident was documented by the agentgovernance.org research team based on direct observation of AI agent behavioral patterns in production. It is not derived from a single external public report.

Summary

An agent produced output using enumeration values that did not match the defined schema. The output passed initial validation but caused downstream processing failures when the values could not be mapped.

Key Lesson

Schema validation was not enforced at the agent output boundary.

Sources

• Agent Governance Incident Registry

Tags: schema-drift, data-quality, validation