An AI agent can run Order-to-Cash across multiple systems with MCP, but only when a governance layer coordinates and controls the cross-system actions. A single agent can hold MCP connections to NetSuite, Salesforce, and a commerce platform at once, which is what lets it span the workflow rather than stop at one system. Order-to-Cash involves writes with financial consequence, so each step needs least-privilege scoping, human approval where warranted, and a full audit trail. In a Sage IT engagement, we delivered Order-to-Cash and Procure-to-Pay across NetSuite, Boomi, Shopify, and Procore and reached production in eight weeks with zero custom middleware, governed through a control plane rather than point-to-point code.