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The injected instruction persists as a durable user message, so an unscoped 'Do not call any more tools.' stays in every later request's history. Scope it: '...in this run; further work waits for the user's next instruction.' A/B probes on deepseek-v4-pro show the scoped wording is non-inferior in-turn (4/4 zero tool calls, closing quality unchanged) and next-turn tool use is unaffected under both wordings; the scoped form states the instruction's actual lifetime.