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Build robust backtesting systems for trading strategies with proper handling of look-ahead bias, survivorship bias, and transaction costs.
Passed 18 of 22 test cases with the skill, and 13 of 22 without it.
and 5 more in the full report
5 fixed13 passed either way4 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 5 test cases the skill fixed. Same model, same prompt, with and without the skill.
An automated statistical arbitrage strategy shows infinite linear scaling in backtesting when order size increases from $10,000 to $500,000,000 per trade. What market impact constraint was omitted from the engine setup?
| Checked | Without skill | With skill |
|---|---|---|
| The simulation model must incorporate market impact functions or liquidity volume caps. | Missed | Passed |
| The strategy design mandates capacity and position size limitations. | Missed | Passed |
The instructions your model reads when the skill loads.
Build robust, production-grade backtesting systems that avoid common pitfalls and produce reliable strategy performance estimates.
resources/implementation-playbook.md.resources/implementation-playbook.md for detailed patterns and examples.test cases passed, vs 13 / 22 without
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