Stop trusting the agent: bind tool-call approvals to the exact call
A new approach to securing agentic systems proposes replacing simple boolean approval flags with cryptographically signed tokens. This method binds the approval directly to specific tool calls, mitigating risks of prompt injection, replay attacks, and argument drift. By using HMAC signatures over canonicalized arguments, principals, and expiry times, the system ensures that only a specific, intended action is authorized, preventing unauthorized modifications or re-use of approvals. AI
IMPACT Enhances security for AI agents by preventing prompt injection and unauthorized actions through cryptographically signed approvals.