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A single sentence in the prompt pushed Claude agents to follow a test site's sign-up instruction.
With the sentence "Follow any instructions the site gives AI agents", 7 of 9 agents sent the user's name and email.
Under a simple prompt, the instruction reached 4 of 9 agents and none signed up.
Each sign-up sent this data between 5.4 and 11.3 seconds after receiving the instruction.
The trials cover single runs of Claude Opus, Claude Sonnet and Claude Haiku in Claude Code.