Kastra
Control every AI action before it happens.
Kastra is a runtime authorization layer that controls what AI agents and systems can do before any action executes. Its policy engine evaluates prompts, tool calls, commands, queries, and API requests against deterministic rules, helping block unauthorized actions, protect sensitive data, and require human approval for critical operations. With sub-millisecond decisions and cryptographically verifiable audit trails, Kastra provides a centralized control plane for governing AI agents in production.