Created for the All Things Agentic Hackathon, August 2026. I built an access-certification tool called muster that reviews the AI agents, tools and identities on a Google Cloud project and issues a verdict per subject. Part of that job means reading A2A agent cards: the self-description a servi...
Source: [Dev.to](https://dev.to/ochinimus/a-prompt-injection-guardrail-passed-a-hostile-card-because-we-batched-the-fields-1dfk)