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PI-Hunter gives developers a proactive auditing tool that surfaces and localizes latent prompt injection vulnerabilities before deployment, filling a gap left by defenses that only act at inference time.
The paper demonstrates that frontier CUA safety is domain-conditioned rather than general, meaning strong browser-surface defenses in Claude Sonnet 4.6 and GPT-5.4 do not extend to coding-agent contexts, and that published ASR benchmarks are unreproducible without the release of RL-optimized injection strings.