Concrete production stories of agents in the enterprise: voucher processing with Claude + UiPath (~3,500 tx/month, rule-perfect validation, 72h → 18h), an Outlook sales agent grounded in internal precedent, and Mia — a Teams-native agent that replaced Workday/Jira timesheets with chat. Where agents win, where pure RPA still wins, and how we evaluate and guardrail them before they touch real work. In-house, our team's timesheets and HR admin run through TimeKeeper, a chat agent on an MCP connector.