The latest articles on DEV Community by altima261 (@altima261). https://dev.to/altima261 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4220131%2F8feba756-6164-4507-96c7-d8ee8cf37616.png https://dev.to/altima261 en altima261 Sun, 01 Nov 2026 07:18:14 +0000 https://dev.to/altima261/how-i-built-trifecta-checker-to-stop-lethal-ai-agents-with-one-api-call-58pa https://dev.to/altima261/how-i-built-trifecta-checker-to-stop-lethal-ai-agents-with-one-api-call-58pa <h1> Trifecta Checker - Lethal Trifecta Safety Gate </h1> <p><strong>Built for Meta Global AI Hackathon Japan 2026 🇯🇵 by altima261</strong></p> <p>🔗 <strong>Live Demo:</strong> <a href="https://trifecta-checker.vercel.app/" rel="noopener noreferrer">https://trifecta-checker.vercel.app/</a><br> 🔗 <strong>GitHub:</strong> <a href="https://github.com/altima261/trifecta-checker" rel="noopener noreferrer">https://github.com/altima261/trifecta-checker</a><br> 🔗 <strong>API:</strong> <a href="https://trifecta-checker.vercel.app/api/check-trifecta" rel="noopener noreferrer">https://trifecta-checker.vercel.app/api/check-trifecta</a></p> <h2> The Problem: The Lethal Trifecta </h2> <p>Coined by Simon Willison, an AI agent becomes a data-theft tool when it has ALL THREE:</p> <ol> <li> <strong>Private Data Access</strong> - inbox, DB, docs</li> <li> <strong>Untrusted Content</strong> - web pages, emails, file uploads </li> <li> <strong>External Communication</strong> - HTTP calls, emails, webhooks</li> </ol> <p>If an agent has all three, prompt injection = data theft.</p> <h2> My Solution: Safety Gate </h2> <p>One API call blocks execution BEFORE it runs.</p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code> bash curl -X POST https://trifecta-checker.vercel.app/api/check-trifecta \ -H "Content-Type: application/json" \ -d '{"tools":["read_gmail","browse_web","send_email"]}' </code></pre> </div> ai security javascript python