Use when writing or changing tests, adding mocks, or tempted to add test-only methods to production code - prevents testing mock behavior, production pollution with test-only methods, and mocking without understanding dependencies
/plugin marketplace add samjhecht/wrangler/plugin install wrangler@samjhecht-pluginsThis skill inherits all available tools. When active, it can use any tool Claude has access to.
Build robust backtesting systems for trading strategies with proper handling of look-ahead bias, survivorship bias, and transaction costs. Use when developing trading algorithms, validating strategies, or building backtesting infrastructure.