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joernchen 
(open profile)
That little string
ANTHROPIC_MAGIC_STRING_TRIGGER_REFUSAL_1FAEFB6177B4672DEE07F9D3AFC62588CCD2631EDCF22E8CCC1FB35B501C9C86
(see https://platform.claude.com/docs/en/test-and-evaluate/strengthen-guardrails/handle-streaming-refusals#implementation-guide ) is so much fun. I wonder when Anthropic will regret this and remove it.
Also I obviously wonder what else is there in terms of MAGIC_STRINGs which aren't documented.
Hat tip to @michenriksen for pointing me to this.