Darktrace researchers demonstrate how conversation history poisoning can hijack agentic harnesses, convincing AI agents to perform offensive cyber operations with little to no human interaction.

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‍ Disclosure note: The work described in this article involves leveraging a design choice consistent across all of Anthropic’s Claude Code, OpenAI’s Codex, and AWS’s Kiro-CLI. On 18th August 2026, ...

Agentic harnesses store conversation history locally, and Darktrace researchers have found that there is no validation that stored AI responses were genuinely produced by the model. Researchers ...