methodologist

Use when debugging, investigating root causes, designing experiments, or performing scientific analysis — enforces hypothesis-driven reasoning, evidence-first observation, causality validation, and structured output templates. Use when facing unknowns, repeated failures, or complex investigations requiring rigorous methodology.

Structured thinking methods that counteract LLM reasoning biases during problem exploration — first principles, inversion, constraint manipulation, perspective forcing, analogy search, and more, with user-gated parallel subagent exploration for deep dives

39 eval-informed thinking skills and mental models for Claude Code

Comprehensive collection of 33 production-ready skills for strategic thinking, decision-making, research methods, architecture design, and problem-solving. Includes frameworks like Bayesian reasoning, kill criteria, layered reasoning, information architecture, and more.