Built-in Skills

Yukkai ships with a rich catalog of built-in skills covering development, documents, business, design, and meta-skills. These are always available and activate automatically when their keywords match your context.

Note: The skill catalog changes over time. Always run skill(action: "list") for the current count and content.

Development & Engineering

Skill	Description
swift-ios	Swift, SwiftUI, iOS/macOS development, Xcode workflows
python-data	Python data science, pandas, numpy, matplotlib
web-fullstack	Full-stack web development (frontend + backend)
web-developpement	Web development (French-oriented conventions)
software-developpement	General software engineering practices
debug	Debugging strategies, stack trace analysis, root cause identification
code-reviewer	Code review best practices, identifying issues and improvements
security-review	Security vulnerability detection and remediation
git-commit-writer	Writing clear, conventional Git commit messages
readme-generator	Generating comprehensive README files
webapp-testing	Web application testing strategies and frameworks

Documents & Office

Skill	Description
pdf-documents	Creating, reading, and manipulating PDF files
word-documents	Microsoft Word document generation and editing
excel-spreadsheets	Spreadsheet creation, formulas, data analysis
powerpoint-presentations	Presentation slide design and content

Business & Management

Skill	Description
comptabilite	Accounting principles, bookkeeping, financial statements
gestion	Business management, operations, organizational strategy
finance	Financial analysis, modeling, investment concepts
droit	Legal knowledge, contract review, compliance
strategy	Strategic planning, competitive analysis, business modeling
project-management	Project planning, agile methodologies, team coordination
product-conception	Product design, user needs, MVP definition

Design & Creative

Skill	Description
web-design	Web UI/UX design, layout, typography, color theory
design-produit	Product design methodology and user-centered design
frontend-design	Frontend implementation with design focus
photographie-ia	AI photography, image composition, visual aesthetics
video-ia	AI video generation, editing, storytelling
brainstorming	Creative ideation, divergent thinking, concept generation

Meta

Skill	Description
skill-creator	Helps create new skills — meta-skill for skill authoring

Managing Built-in Skills

Built-in skills can be deactivated but not deleted:

skill(action: "deactivate", id: "droit")   // Prevent auto-activation
skill(action: "activate", id: "droit")     // Re-enable

You can also view full details of any skill:

skill(action: "info", id: "swift-ios")

Automatic Activation

Each skill has activation keywords. When your message or project context contains those keywords, the skill's system prompt is automatically injected. For example:

• Asking about "SwiftUI views" → activates swift-ios
• Asking to "create a PDF report" → activates pdf-documents
• Asking to "review the balance sheet" → activates comptabilite

You don't need to think about which skill to use — Yukkai handles it automatically. If you want to force a skill on or off regardless of keywords, use explicit activate/deactivate.