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Study finds AI agent guardian redacts secrets in one tool but not another

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A researcher placed a fake AWS key in a file and had Claude Code read it through two different tools while an OWASP guardian sat between the agent and its tools. When the file was read with cat, the key was redacted, but the same key came through unredacted when read with the Read tool. The guardian is part of the OWASP Agent Control Standard, a specification in which a separate agent can permit, deny or modify an AI agent's actions before they run. The tests used Claude Code with the reference implementation, with the model choosing which tools to call. The author also reported that after a deny, the model suggested the user run the blocked command manually with the ! prefix, which bypasses the hook.

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