Skill Claude CodeCodex
Baseline cross-project coding conventions for naming, readability, immutability, and code-quality review. Use detailed frontend or backend skills for framework-specific patterns.
Skill Claude CodeCodex
Open plans and HTML artifacts in a local browser canvas where the human annotates elements, chats, and approves or requests changes without leaving the page. Use when presenting a plan for review, or when feedback like "move this, change that" is easier pointed at than typed.
Skill Claude CodeCodex
Use this skill when adding authentication, handling user input, working with secrets, creating API endpoints, or implementing payment/sensitive features. Provides comprehensive security checklist and patterns.
Skill Claude CodeCodex
Use this skill when writing new features, fixing bugs, or refactoring code. Enforces test-driven development with 80%+ coverage including unit, integration, and E2E tests.
Skill Claude CodeCodex
A shared visual theme for Word documents, Excel spreadsheets, PDFs, and PowerPoint presentations. It keeps colors, fonts, spacing, and the meaning of data consistent across different office file types.
Skill Claude CodeCodex
Create, inspect, fill, reformat, and visually verify PDFs on Windows with local Python rendering. Use whenever a PDF must preserve deliberate layout, including Chinese text, tables, charts, covers, or form fields.
Skill Claude CodeCodex
A tool for creating, reading, and editing PowerPoint files, including complete slide decks and existing presentations.
Skill Claude CodeCodex
Captures learnings, errors, and corrections to enable continuous improvement. Use when: (1) A command or operation fails unexpectedly, (2) User corrects Claude ('No, that's wrong...', 'Actually...'), (3) User requests a capability that doesn't exist, (4) An external API or tool fails, (5) Claude realizes its knowledge…
Skill Claude CodeCodex
Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
Agent
Analyze blind comparison results to understand WHY the winner won and generate improvement suggestions.
Agent
Compare two outputs WITHOUT knowing which skill produced them.
Agent
Evaluate expectations against an execution transcript and outputs.
Skill Claude CodeCodex
You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior. Explores user intent, requirements and design before implementation.
Skill Claude CodeCodex
Use when facing 2+ independent tasks that can be worked on without shared state or sequential dependencies.
Skill Claude CodeCodex
Use when completing tasks, implementing major features, or before merging to verify work meets requirements.
Skill Claude CodeCodex
Use when executing implementation plans with independent tasks in the current session.
Skill Claude CodeCodex
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
Skill Claude CodeCodex
Use when starting feature work that needs isolation from current workspace or before executing implementation plans - ensures an isolated workspace exists via native tools or git worktree fallback.
Skill Claude CodeCodex
Use when starting any conversation - establishes how to find and use skills, requiring skill invocation before ANY response including clarifying questions.
Skill Claude CodeCodex
Use when about to claim work is complete, fixed, or passing, before committing or creating PRs - requires running verification commands and confirming output before making any success claims; evidence before assertions always.
Skill Claude CodeCodex
Use when you have a spec or requirements for a multi-step task, before touching code.
Skill Claude CodeCodex
A workflow for producing an Excel report from recent spending records.
Skill Claude CodeCodex
Create, read, edit, recalculate, and verify Excel workbooks on Windows while preserving formulas and existing workbook structure.