AI security startup AIR has emerged from stealth with $50 million raised across two seed rounds to help companies vet the growing array of skills, plugins and MCP servers that AI agents rely on. As businesses increasingly grant agents access to sensitive systems, a new software supply chain of add-ons and tools has formed with little of the oversight given to traditional software, leaving firms exposed to attacks in which malicious actors poison the content an agent consumes rather than attacking it directly.

Founded by Yair Saban and Niv Hoffman, both veterans of Israel's Unit 8200 intelligence corps, AIR discovers agents running within a company, continuously checks the tools and skills they use against a maintained whitelist, and blocks anything that fails its security criteria, while also flagging unapproved AI tool use by employees. The funding comprised a $10 million round led by Sequoia and a $40 million round led by Greenoaks, with angel investors including Cognition's Zach Frankel and Wiz co-founder Yinon Costica also taking part. Saban says the platform currently filters out around 27% of add-ons and skills it scans, and that AIR has more than 20 customers, roughly a quarter of them large enterprises, with strongest demand from regulated sectors such as financial services and pharmaceuticals. Competitors including Noma Security, Zenity and Astrix Security are building similar tools.