I will not promote: About half our product usage now comes through the API, and we almost missed what that meant

We build a document platform. The app has an editor, templates, the usual. A while back we shipped an API, mostly because a few technical customers asked. This summer we looked at the numbers: about half of all documents ever created on the platform came through the API and MCP, created by our users' coding agents rather than by the users themselves. Nobody announced this to us. Usage just migrated while we were watching the app's metrics. Once we saw it we re-read support and sales notes, and the pattern was everywhere. Our most engaged users were prompting agents like Claude Code to write their documents, and the agents needed programmatic everything: publish, edit, analytics. The app was becoming the read-only view of work that happened elsewhere. So we rebuilt distribution around that: this week we shipped an agent-native CLI (JSON output everywhere, stable aliases, safe defaults), designed so a coding agent can drive it as comfortably as a person can. Lessons that generalize: Segment your usage by WHO initiated the action, human or agent. The split is invisible in normal dashboards. If agents are heavy users, interface stability becomes a product feature. We keep old command names as aliases now. Your docs are now part of your API surface. Agents read them literally, and a wrong example becomes a bug report. Anyone else seeing agent-driven usage overtake human-driven in their product? How did you notice it?