Research
Building a System One Model for Prompt Injection
First reported · Discovered stackone.com
Page published
Earliest dated coverage: 15 Oct 2026 · First observed: 20 Oct 2026 · Latest dated coverage: 15 Oct 2026
Coverage timeline
Single-source research — one report is available.
Why it matters
StackOne’s decision-model approach addresses screening costs that can limit how thoroughly defenders inspect agent tool outputs for malicious instructions.
StackOne describes replacing the generative-LLM reviewer in its Defender prompt-injection guard with a decision model for screening tool results. The approach aims to reduce screening cost and latency so the reviewer can check every tool result alongside an existing classifier, rather than only handling escalated cases.