Communicating with AI agents (like OpenClaw) via messaging apps (like Slack and Telegram) has become much more popular. But it can expose users to a largely unrecognized LLM-specific data exfiltration risk, because these apps support ‘link previews’ as a feature. With previews enabled, user data can be exfiltrated automatically after receiving a malicious link in an LLM-generated message -- whereas without previews, the user would typically have to click the malicious link to exfiltrate data. For example, OpenClaw via Telegram is exposed by default. Test any agent / communication app pairing below!