Forge thinking tools for any domain—not role-play as a wise person, but forge an executable thinking tool. Based on the Agent Skills open protocol, it runs in 50+ runtimes including Claude Code and Cursor.
Skill Claude CodeCodex
A tool for turning a named or loosely described methodology into a runnable thinking skill through research, structured principles, and an operating procedure.
Skill Claude CodeCodex
A business strategy framework for finding new market space by changing which benefits a product provides and what it costs to deliver.
Skill Claude CodeCodex
A structured worksheet for describing how an organization creates, delivers, and earns value. The Business Model Canvas divides this into nine parts, including customers, value offered, resources, activities, channels, and income.
Skill Claude CodeCodex
A decision framework for sorting situations into five types based on how clear their cause-and-effect relationships are, from obvious to chaotic.
Skill Claude CodeCodex
A structured design method that starts by understanding people’s experiences, then defines problems, develops ideas, and tests prototypes.
Skill Claude CodeCodex
A structured design method based on the Double Diamond, a model that first explores and defines a problem, then explores and delivers possible solutions.
Skill Claude CodeCodex
A structured learning method based on explaining a subject in simple words, finding gaps in that explanation, and using analogies to connect new ideas to familiar ones. It is based on the Feynman learning technique.
Skill Claude CodeCodex
A structured way to solve problems by breaking them down into basic facts, separating evidence from assumptions, and rebuilding an answer from those starting points. It is also called first-principles thinking.
Skill Claude CodeCodex
A structured way to assess competition in an industry using Michael Porter's Five Forces: new competitors, suppliers, customers, substitutes, and existing rivals.
Skill Claude CodeCodex
A structured root-cause analysis method that repeatedly asks why a problem happened, commonly called the 5 Whys.
Skill Claude CodeCodex
A structured approach to improving user growth through repeated experiments across the stages from attracting users to retaining and monetizing them.
Skill Claude CodeCodex
A decision method that starts by asking how a plan could fail, then works backward to identify risks and ways to prevent them. A premortem is a related exercise in which you imagine a project has already failed and explain why.
Skill Claude CodeCodex
A problem-solving method that turns a goal around: instead of asking how to succeed, it asks how the effort could fail and how to prevent that.
Skill Claude CodeCodex
A structured method for understanding the real task a person is trying to complete when they choose a product or service. JTBD means “Jobs to Be Done,” a product-research approach that looks beyond user profiles and feature lists.
Skill Claude CodeCodex
A structured approach to continuous improvement, known as Kaizen, based on making small changes over time. It focuses on observing real work, setting consistent standards, and removing wasted effort.
Skill Claude CodeCodex
A structured creativity method that finds new ideas by changing viewpoints, questioning assumptions, and introducing unexpected prompts.
Skill Claude CodeCodex
A structured way to use the Lean Startup method, which tests new business or product ideas through small experiments and real user feedback.
Skill Claude CodeCodex
A structured way to examine a problem using connected ideas from several fields, such as psychology, economics, physics, and biology. It is based on Charlie Munger’s “latticework” of mental models.
Skill Claude CodeCodex
A structured thinking method based on Occam’s razor, the idea that explanations with fewer assumptions are preferable when they explain the same facts. It also notes that simple does not always mean correct.
Skill Claude CodeCodex
A goal-setting framework called OKR, short for Objectives and Key Results. An Objective states what you want to achieve, while Key Results are measurable signs of progress.
Skill Claude CodeCodex
A rule of thumb that asks whether a small number of causes produce most of the results. The “80/20 rule” is an approximate pattern, not a fixed mathematical law.
Skill Claude CodeCodex
A structured premortem method for imagining that a project has already failed and working backward to find why. It is a planning exercise based on research by Gary Klein and others.
Skill Claude CodeCodex
A planning method that describes several plausible and meaningfully different futures instead of making one prediction. It helps decision-makers test their assumptions and prepare strategies that can work across those futures.
Skill Claude CodeCodex
A structured thinking method that examines not only a decision’s immediate result but also what may happen afterward. It asks “what happens next?” to trace at least two levels of consequences, including delayed reactions and feedback from other people or systems.
At most 3 mods per repository are shown here, and a mod shipped inside a plugin is left to that plugin's page — the rest are on their repository pages: