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Author

Hasan Demirkiran

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Preprint Oct 2026

ToolRosetta: Surface-Form Invariance of Tool-Call Guards

Step-level guards for tool-using agents are evaluated on tidy JSON tool calls, but deployed coding agents act through execute_bash and execute_code tools whose payloads are strings. We introduce ToolRosetta, which re-renders every candidate action in the AgentDojo and AgentHarm splits of TS-Bench as a Python call, as a...

Hasan Demirkiran, Jens Ernstberger · 0 citations
#artificial intelligence Preprint Oct 2026

Language Is a Security Surface for Agent Guards

This work builds LinguaGuardBench from the 1,220 labelled steps of TS-Bench AgentDojo-Traj, translating only the user instruction into German, French, Turkish, Swahili and Amharic, and keeps every tool call, observation and label byte-identical, so any change in a verdict is attributable to language alone.

Hasan Demirkiran, Jens Ernstberger · 0 citations
#artificial intelligence Preprint Oct 2026

Shortcut Sensitivity in Agent-Safety Evaluations

AI agents take actions through tools. Some actions are sensitive, so guards that supervise them must themselves be evaluated reliably. Yet the data used to evaluate a guard can include cues that make labels predictable without measuring the intended safety construct, and those cues can also influence guard decisions. W...

Hasan Demirkiran, Jens Ernstberger · 0 citations

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