Detect lookahead bias in trading indicator and strategy code.
npx skills add https://github.com/lgbarn/quantdev --skill lookahead-guard
Please help me install this Agent Skill. Skill: lookahead-guard Source: https://github.com/lgbarn/quantdev/tree/main/skills/lookahead-guard Command: npx skills add https://github.com/lgbarn/quantdev --skill lookahead-guard
This Skill prevents the most common and devastating bug in trading systems: lookahead bias, which occurs when code accesses data that wouldn't be available at the time a decision is made.
Review the attached indicator code for any instances of using the current bar's close price before it is confirmed.
High-intent search queries and answers about installing and using this skill.
Lookahead bias in trading code occurs when your strategy accesses future bar information or unconfirmed current bar data during signal generation, causing backtesting results to be artificially inflated by phantom profits.
You detect lookahead bias by reviewing indicator code to identify future data access, close-price peeking during bar formation, and improper array indexing that uses future bar information instead of data from completed bars and the current tick.
Yes, it provides cross-platform guidance with specific dangerous and safe code patterns for Pine Script, NinjaScript, Go, and Python to ensure your trading strategy correctly uses data from completed bars.
The best way to prevent future data access in backtesting strategies is to enforce the core principle that only data from completed bars and the current tick is permissible at any decision point during indicator development.
Your backtest results show artificial profits due to lookahead bias from close-price peeking during bar formation, where your code accesses unconfirmed current bar data before the trading decision is actually made.
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