Cotool Raises $7.4m Seed to Build the AI Operating System for Security Teams

March 5, 2026

“Offense that scales with tokens.” We love this phrase from Cotool’s HelloWorld seed round blog post. They didn’t wait for funding to start building - we think that’s part of what attracted investors like us to this raise - but since closing the $7.4 million they have certainly been moving even faster to get their product in market with early adopters: “We're in production with teams at Ramp, Elise AI, and other world-class security teams. Our agents have completed over 50,000 runs across detection, triage, investigation, and response.”

From Homebrew’s perspective, we’ve been eagerly partnering with startups working to help developers, teams, and consumers navigate the threat environment in an AI-first world. If you’re building something here we’re happy to hear from you. And if you’re building a technical security team at your company, check out Cotool.