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A股ETF套利/折溢价分析。当用户说"ETF套利"、"ETF折溢价"、"ETF arb"、"IOPV"、"ETF申赎"、"ETF折价"、"ETF溢价"时触发。基于 cn-stock-data 获取数据，分析ETF套利机会。支持 formal/brief 两种输出风格。
Passed 13 of 23 test cases with the skill, and 12 of 23 without it.
3 fixed11 passed either way8 still failing2 broke
Tokens, turns and time describe resource use, not a dollar price.
The instructions your model reads when the skill loads.
通过 cn-stock-data skill 获取数据：
test cases passed, vs 12 / 23 without
Published skills whose descriptions closely match this one, with their headline benchmark lift.
More skills from the same source and nearby in the registry, with their headline benchmark lift.