Every Tool Call Succeeded. The Workflow Still Failed.
TL;DR for operators An AI agent can complete every reported tool call while leaving a business workflow in an inconsistent state. The critical distinction is between successful invocations and the external effects that remain after the workflow commits or aborts. A study of 98,291 remotely discovered Model Context Protocol (MCP) tools found that 74.0% emitted at least one standard annotation field. Yet the standard annotation vocabulary could not fully express any of eight transactional capabilities identified by the researchers. ...