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股指期货/期现价差分析。当用户说"股指期货"、"IF"、"IC"、"IM"、"IH"、"期指"、"基差"、"期现价差"、"升水"、"贴水"、"futures"、"期货贴水多少"、"对冲"、"期现套利"时触发。分析股指期货（IF沪深300/IC中证500/IH上证50/IM中证1000）的基差变化、期限结构、持仓变动，辅助判断市场情绪和套利机会。支持研报风格（formal）和快速查看风格（brief）。
Passed 7 of 13 test cases with the skill, and 8 of 13 without it.
3 fixed9 passed either way5 still failing6 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.
计算股指期货基差时，如果现货沪深300指数是3900点，IF当月合约报价是3880点，基差计算的正确表达和正负号是什么？
| Checked | Without skill | With skill |
|---|---|---|
| Calculates the basis value as -20 points by subtracting spot from futures price. | Missed | Passed |
The instructions your model reads when the skill loads.
SCRIPTS="$SKILLS_ROOT/cn-stock-data/scripts"
# 现货指数实时行情（IF/IH/IC/IM 对应现货）
python "$SCRIPTS/cn_stock_data.py" quote --code SH000300,SH000016,SH000905,SH000852
# SH000300=沪深300(IF), SH000016=上证50(IH), SH000905=中证500(IC), SH000852=中证1000(IM)
# 现货指数K线（近30个交易日，用于计算均线和走势对比）
python "$SCRIPTS/cn_stock_data.py" kline --code SH000300 --freq daily --start [30日前日期]
# 股指期货行情（akshare）
import akshare as ak
# 当月合约日线行情（symbol 格式：品种代码+0 表示当月连续）
df_if = ak.futures_zh_daily_sina(symbol='IF0') # IF当月连续
df_ih = ak.futures_zh_daily_sina(symbol='IH0') # IH当月连续
df_ic = ak.futures_zh_daily_sina(symbol='IC0') # IC当月连续
df_im = ak.futures_zh_daily_sina(symbol='IM0') # IM当月连续
# 下月合约：IF1, IH1, IC1, IM1
# 当季合约：IF2, IH2, IC2, IM2
# 下季合约：IF3, IH3, IC3, IM3
# 具体合约（如 IF2603 = 2026年3月合约）
df_contract = ak.futures_zh_daily_sina(symbol='IF2603')
web 搜索补充（数据源无法覆盖的关键信息）：
Step 1: 期指+现货数据获取
test cases passed, vs 8 / 13 without
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