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Sandboxing Agent Tool Calls with Capability Tokens

Marcus Tan, Jonas Berg

RTUA 2026 · pp. 10–18 · 3 July 2026 · 10.xxxx/ctm.pr.2026.0002

Tool-using agents are typically granted broad credentials, so a single injected instruction can cause large harm. We describe a capability-token scheme in which every tool call carries a narrowly scoped, short-lived token issued by a policy layer outside the model. A prototype blocks all 41 attack scripts in our test suite with under 4 ms of added latency.

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