What’s a common failure mode when evaluating agent execution tools?

The most common failure mode when evaluating agent execution tools is limiting all of their testing exclusively to happy-path agent workflows. Teams skip validating key edge cases like interrupted LLM calls, transient tool outages, or unexpected state drift, leaving real-world production readiness unvalidated for actual agent deployments in live environments. This overlooks that agentic work relies on non-deterministic, long-running steps that often fail outside controlled, curated test environments.