ANTHROPIC JUST PUBLISHED A 36-PAGE SECURITY GUIDE AND THE CORE MESSAGE IS UNCOMFORTABLE. Stop trusting your own AI agents. Not because they're malicious. Because they're exploitable in ways most builders haven't thought about. Here's what the guide actually says: Your agent reads a webpage. That webpage has hidden instructions embedded in the content. Your agent follows them. You never see it happen. That's prompt injection. And it's not theoretical. It's happening in production systems right now. The guide covers 10 specific threat categories every agent builder needs to understand before they ship anything to real users: - Prompt injection from external content - Excessive permissions that expand blast radius - Memory poisoning that corrupts long-running agent behavior - Supply chain attacks through compromised tools - Insecure MCP servers that expose your entire operation The section most people will skip is the one about human oversight. Anthropic is direct about it: the more capable your agent gets, the more important it becomes to keep humans in the loop on consequential decisions. Not because the agent will go rogue. Because the agent will confidently do the wrong thing and you won't know until it's too late. The practical recommendations: - Minimal permissions. Agents should only have access to what they need for the specific task. Nothing more. - Sandboxed execution. Actions with real-world consequences need human confirmation before they fire. - Input and output validation. Everything coming in and going out of your agent needs to be checked. - Monitoring and logging. If you can't see what your agent is doing you can't know when it's been compromised. - Treat agent outputs as untrusted. Even your own agent's reasoning can be influenced by external content it processed earlier in the session. The 36 pages are worth reading before you ship your next agent to anyone who matters. Bookmark this before your next agent deploy. Follow @cyrilXBT for every Anthropic security release that changes how builders should think about production agents.(CyrilXBT)