How Cogent builds AI agents that have to be right every single time | Geng Sng (Co-founder & CTO - Cogent)

<p>Geng Sng is co-founder and CTO of Cogent, which builds autonomous agents that remediate vulnerabilities for enterprise security teams. Today, Cogent&#39;s agents process billions of security events per day, maintaining a live context graph of every asset and vulnerability across customer environments. In this conversation, Geng walks through Cogent&#39;s hot vs cold context split, the sub-agents that handle side quests, and the two graphs they run in parallel.</p><p>–</p><p><strong>We also discuss:</strong></p><ul><li>Why defensive security is harder for AI than offensive</li><li>Under the hood of Cogent&#39;s three agents</li><li>Inside Cogent&#39;s “read only” by-default sandboxes</li><li>Why graph databases don&#39;t scale for security data</li><li>Cogent Research and the move into formal verification</li><li>Why interactive agents need a deeper planning phase to one-shot</li></ul><p>–</p><p><strong>Referenced:</strong></p><ul><li><a href="https://abnormal.ai/" target="_blank" rel="ugc noopener noreferrer">Abnormal AI</a></li><li><a href="https://aws.amazon.com/s3/" target="_blank" rel="ugc noopener noreferrer">Amazon S3</a></li><li><a href="https://www.anthropic.com/" target="_blank" rel="ugc noopener noreferrer">Anthropic</a></li><li><a href="https://www.gnu.org/software/bash/" target="_blank" rel="ugc noopener noreferrer">Bash</a></li><li><a href="https://chatgpt.com/" target="_blank" rel="ugc noopener noreferrer">ChatGPT</a></li><li><a href="https://www.anthropic.com/claude-code" target="_blank" rel="ugc noopener noreferrer">Claude Code</a></li><li><a href="https://red.anthropic.com/2026/mythos-preview/" target="_blank" rel="ugc noopener noreferrer">Claude Mythos</a></li><li><a href="https://deepmind.google/blog/introducing-codemender-an-ai-agent-for-code-security/" target="_blank" rel="ugc noopener noreferrer">CodeMender</a></li><li><a href="https://openai.com/codex/" target="_blank" rel="ugc noopener noreferrer">Codex</a></li><li><a href="https://www.cogent.com/" target="_blank" rel="ugc noopener noreferrer">Cogent</a></li><li><a href="https://cursor.com/" target="_blank" rel="ugc noopener noreferrer">Cursor</a></li><li><a href="https://deepmind.google/" target="_blank" rel="ugc noopener noreferrer">Google DeepMind</a></li><li><a href="https://openai.com/index/gpt-5-5-with-trusted-access-for-cyber/" target="_blank" rel="ugc noopener noreferrer">GPT-5.5-Cyber</a></li><li><a href="https://jupyter.org/" target="_blank" rel="ugc noopener noreferrer">Jupyter</a></li><li><a href="https://www.letta.com/" target="_blank" rel="ugc noopener noreferrer">Letta</a></li><li><a href="https://www.mozilla.org/" target="_blank" rel="ugc noopener noreferrer">Mozilla</a></li><li><a href="https://openai.com/" target="_blank" rel="ugc noopener noreferrer">OpenAI</a></li><li><a href="https://www.anthropic.com/news/claude-opus-4-6" target="_blank" rel="ugc noopener noreferrer">Opus 4.6</a></li><li><a href="https://www.anthropic.com/news/claude-opus-4-7" target="_blank" rel="ugc noopener noreferrer">Opus 4.7</a></li><li><a href="https://vercel.com/" target="_blank" rel="ugc noopener noreferrer">Vercel</a></li></ul><p>–</p><p><strong>Where to find Geng:</strong></p><ul><li><a href="https://www.linkedin.com/in/geng-sng/" target="_blank" rel="ugc noopener noreferrer">LinkedIn</a></li></ul><p>–</p><p><strong>Where to find Harrison:</strong></p><ul><li><a href="https://www.linkedin.com/in/harrison-chase-961287118/" target="_blank" rel="ugc noopener noreferrer">LinkedIn</a></li><li><a href="https://x.com/hwchase17" target="_blank" rel="ugc noopener noreferrer">Twitter/X</a></li></ul><p>–</p><p><strong>Where to find LangChain:</strong></p><ul><li><a href="https://www.langchain.com/" target="_blank" rel="ugc noopener noreferrer">Website</a></li><li><a href="https://docs.langchain.com/" target="_blank" rel="ugc noopener noreferrer">Docs</a></li></ul><p>–</p><p>Send feedback or questions to <a href="mailto:maxagency@langchain.dev" target="_blank" re