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A prompt-injection guardrail passed a hostile card because we batched the fields

This story is from 2026-08-23. It is preserved in the archive; the latest stories are on the live feed.

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 service s…

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  1. 2026-08-23 13:18 · DEV Community — AI
    A prompt-injection guardrail passed a hostile card because we batched the fields

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