Skill Claude CodeCodex
Static visual content across 20+ formats - diagrams, mermaid, infographics, D3 dashboards, comics, icons, wallpaper - via Flux, Nano Banana Pro, and GPT-Image-2. USE WHEN art, illustration, diagram, flowchart, infographic, header image, blog social thumbnail, visualize, generate image, mermaid, architecture diagram…
Skill Claude CodeCodex
Adversarially hunt for correctness bugs and regressions in a change set. Use when reviewing a diff before finalizing, during a cleanup pass, or when asked to find bugs, pressure-test, or stress-test recently modified code. Triggers on: "find bugs", "what could break", "review for correctness", "did I break anything"…
Skill Claude CodeCodex
Structure a code repository's documentation and context layer so an AI agent grasps the project fast, using the Interpretable Context Methodology (ICM) by Jake Van Clief. Covers the three operating rules (pointers over payload, one home per fact, name the section), an optional layered context model, and the honest…
Skill Claude CodeCodex
Structure a repository and its documentation so AI coding agents can work effectively. Covers knowledge hierarchy, progressive disclosure, mechanical enforcement of architecture, and entropy management. Use when setting up a new project for agent-first development, refactoring a repo to be more agent-friendly…
Skill Claude CodeCodex
Write effective AGENTS.md files that give coding agents the context they need to work in a repository. Use when creating a new AGENTS.md, improving an existing one, setting up a repo for AI coding agents, or onboarding agents to a codebase. Triggers on: "write AGENTS.md", "create AGENTS.md", "agent instructions", "set…
Skill Claude CodeCodex
Generate an ARCHITECTURE.md file for a codebase following matklad's principles. Use when asked to "write an architecture doc", "create ARCHITECTURE.md", "document the architecture", "explain the codebase structure", "write a codemap", or when onboarding contributors to a project. Based on…
Skill Claude CodeCodex
Behavioral testing methodology — test what users experience, not how code is structured. Use when writing tests, reviewing test quality, planning test strategy for new features, or when existing tests are brittle/verbose/coupled to implementation details. Triggers: writing tests, TDD, test review, "tests keep…
Skill Claude CodeCodex
Physics-based reasoning framework (Musk methodology) that deconstructs a problem to irreducible fundamental truths, classifies every element as hard constraint, soft constraint, or assumption, then reconstructs the optimal solution from fundamentals alone. USE WHEN first principles, fundamental truths, challenge…
Skill Claude CodeCodex
Adversarial analysis deploying parallel expert agents to stress-test ideas, strategies, and plans — decomposes into atomic claims, attacks them, then steelmans and counter-argues, producing severity-ranked findings with remediation. USE WHEN red team, attack idea, counterarguments, critique, stress test, devil's…
Skill Claude CodeCodex
Simplify and refine recently modified code for clarity and consistency. Use after writing or modifying code, during cleanup passes, or when asked to simplify/refactor without changing behavior.
Skill Claude CodeCodex
Generate a portable DESIGN.md source-of-truth plus a live HTML style-guide page for the current project — discover brand tokens, write the 9-section spec, build and verify a visual reference page.
Skill Claude CodeCodex
End-of-session cleanup pass for Swift code. Use this skill whenever the user asks to "clean up", "polish", "tidy", "refactor", or "review" Swift work at the end of a coding session, or when they invoke this skill by name. Performs a holistic review of files modified during the session — simplification, type-driven…
Skill Claude CodeCodex
End-of-session cleanup pass for TypeScript, React, and web code. Use this skill whenever the user asks to "clean up", "polish", "tidy", "refactor", or "review" web/frontend work at the end of a coding session, or when they invoke this skill by name. Performs a holistic review of files modified during the session …
Skill Claude CodeCodex
Write high-signal code comments for humans and coding agents. Use when adding inline comments, docstrings, API comments, or local rationale near code. Triggers on: "write better comments", "comment this", "document why", "agent-friendly comments", "explain this code with comments", "docstring".
Skill Claude CodeCodex
Correct-by-construction TypeScript and Effect standards. Use for TypeScript engineering, Effect code, or when another skill needs the user's coding standards.
Skill Claude CodeCodex
Generates production-ready TypeScript CLIs via a 3-tier template system (manual arg parsing, Commander.js, oclif), each shipping full implementation, docs, package.json, strict config, JSON output, and exit-code compliance. USE WHEN create CLI, build CLI, command-line tool, wrap API, add command, upgrade tier…
Skill Claude CodeCodex
The 23 Gang of Four object-oriented design patterns (Gamma, Helm, Johnson, Vlissides, 1994) distilled as a practical field guide, not a catalog. Use when naming a shape in code review, choosing between competing designs, deciding whether to introduce indirection, or auditing for over-abstraction. Each pattern…
Skill Claude CodeCodex
Build design system components and UI that are accessible, themeable, and visually polished. Use when building buttons, dialogs, forms, cards, or any reusable UI components. Covers component API design, design tokens, accessibility, theming, visual design rules, and interaction patterns. Triggers on: "build a…
Skill Claude CodeCodex
Design Effect services. Use when designing a new Effect service module or auditing an existing codebase for service, Layer, and composition improvements.
Skill Claude CodeCodex
Patterns for building lightweight, zero-dependency TypeScript tools and libraries. Use when building new CLI tools, libraries, or utilities from scratch. Use when refactoring existing TypeScript projects to remove unnecessary dependencies. Use when writing fetch wrappers, CLI parsers, loggers, config merging, string…
Skill Claude CodeCodex
Build native macOS desktop applications in Swift using AppKit and SwiftUI. Use when building or modifying macOS .app bundles, NSDocument-based apps, menu bar apps, preferences windows, NSWindow/NSToolbar/NSSplitView layouts, NSMenu/NSStatusItem, Core Data/SwiftData/GRDB persistence, drag-and-drop, undo/redo…
Skill Claude CodeCodex
Teaches agents to write modern CSS using native features instead of legacy hacks, workarounds, and JavaScript. Covers layout, animation, color, typography, selectors, and workflow patterns with 64 old-vs-modern comparisons. The agent should always prefer modern CSS approaches, warn about browser compatibility for…
Skill Claude CodeCodex
Prevent unnecessary React useEffect usage by steering code toward derived state, event handlers, memoization, key-based resets, useSyncExternalStore, and framework or query-library data APIs. Use when writing or reviewing React/Next.js components, refactoring effect-heavy code, or when a change introduces useEffect…
Skill Claude CodeCodex
Type-driven design principle: transform unstructured data into structured types at system boundaries, making illegal states unrepresentable. Use when writing or reviewing code that validates input, designs data types, defines function signatures, handles errors, or models domain logic. Use when you see validation…