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Window functions, grain discipline and the join that silently fans out rows — with the row count checked before the number is believed.
Passed 17 of 22 test cases with the skill, and 14 of 22 without it.
3 fixed14 passed either way5 still failing0 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.
I need a SQL query to calculate total order value alongside customer demographics by joining an `orders` table (1 row per order) with an `order_items` table (multiple rows per order). Should I direct-join and SUM(item_price), or pre-aggregate `order_items` first?
| Checked | Without skill | With skill |
|---|---|---|
| Recommends pre-aggregating order_items by order_id before joining to orders | Passed | Passed |
| Validates row counts or primary key uniqueness to prevent silent fan-out | Missed | Passed |
The instructions your model reads when the skill loads.
Window functions, grain discipline and the join that silently fans out rows — with the row count checked before the number is believed.
test cases passed, vs 14 / 22 without
More skills from the same source and nearby in the registry, with their headline benchmark lift.