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Anthropic Official Skills and Plugins

STATUS: active OWNER: infrastructure CATEGORY: tooling COST: free (all skills and plugins are local) ADDED: 2026-04-01 UPDATED: 2026-04-01

OVERVIEW

GE uses 6 Anthropic-compatible skills and 8 official plugins installed at the project level. Skills provide domain-specific knowledge injection. Plugins provide structured workflows and language tooling. Both auto-activate based on context — no manual triggering needed for most.

SKILLS (in .claude/skills/)

Skill Purpose Used By Source
ui-ux-pro-max Design intelligence — 67 styles, 161 palettes, typography, UX guidelines Floris, Floor, Martijn, Alexander nextlevelbuilder/ui-ux-pro-max-skill
nano-banana Gemini image generation — mockups, hero images, brand exploration Felice, Christel, Ilian, Alexander, Valentijn kingbootoshi/nano-banana-2-skill
webapp-testing Playwright-based web app testing patterns Marije, Judith anthropics/skills
brand-guidelines Structured brand voice enforcement Rick, Christel, Valentijn, Margot anthropics/skills
mcp-builder Accelerates MCP server creation Infrastructure/tooling anthropics/skills
skill-creator Accelerates skill authoring Infrastructure/tooling anthropics/skills

SKILL DETAILS

ui-ux-pro-max — The primary design intelligence layer. Provides 67 named design styles, 161 curated color palettes, typography pairing rules, and UX interaction guidelines. Auto-activates on any UI-related task. See also: ui-ux-pro-max.md.

nano-banana — Gemini-powered image generation for mockups, hero images, and brand visual exploration. Uses Flash model for cheap iteration, Pro model for final deliverables. See also: nano-banana-2.md.

webapp-testing — Provides Playwright-based testing patterns for web application E2E and integration tests. Used by Marije and Judith during Phase 8 (Integration) testing.

brand-guidelines — Enforces structured brand voice across all content-producing agents. Ensures tone, terminology, and messaging consistency with the client's approved brand identity.

mcp-builder — Accelerates creation of new MCP (Model Context Protocol) servers. Used by infrastructure and tooling agents when extending GE's tool ecosystem.

skill-creator — Accelerates authoring of new Claude skills. Used when GE needs to package domain knowledge as a reusable skill.

PLUGINS (in .claude/plugins/)

Plugin Purpose Used By Source
feature-dev Structured feature development workflow (most popular, 89k installs) All dev agents (Urszula, Floris, Floor, Maxim, Martijn) anthropics/claude-plugins-official
code-review Automated code review with specialized agents Koen anthropics/claude-plugins-official
security-guidance Security warnings when editing sensitive files Victoria, all dev agents anthropics/claude-plugins-official
code-simplifier Code simplification and refactoring All dev agents, Koen anthropics/claude-plugins-official
typescript-lsp TypeScript language server (go-to-def, find refs, errors) Floris, Floor, Urszula, Maxim anthropics/claude-plugins-official
pyright-lsp Python type checking Koen, orchestrator work anthropics/claude-plugins-official
swift-lsp Swift language server for iOS Martijn anthropics/claude-plugins-official
pr-review-toolkit PR review agents for comments, tests, error handling Marta, Iwona anthropics/claude-plugins-official

PLUGIN DETAILS

feature-dev — Enforces a structured feature development workflow: requirements analysis, implementation plan, coding, testing, documentation. All dev agents use this as their primary development loop.

code-review — Provides automated code review with specialized review agents for different concerns (logic, style, security, performance). Primary tool for Koen's deterministic quality gate in Phase 8.

security-guidance — Surfaces security warnings when agents edit sensitive files (auth, crypto, secrets, config). Active for Victoria's threat modeling and as a passive guard for all dev agents.

code-simplifier — Identifies opportunities for code simplification and refactoring. Helps enforce the 300-line file limit from CODEBASE-STANDARDS.md. Used by all dev agents and Koen during review.

typescript-lsp — Provides TypeScript language server capabilities: go-to-definition, find references, real-time type errors. Essential for Floris, Floor, Urszula, and Maxim during web frontend development.

pyright-lsp — Python type checking via Pyright. Used by Koen for Python code review and during orchestrator/executor development.

swift-lsp — Swift language server for iOS development. Used exclusively by Martijn for native iOS (Swift/SwiftUI) work.

pr-review-toolkit — PR review agents that analyze comments, test coverage, and error handling. Used by Marta and Iwona at the merge gate (Phase 8, G8).

INSTALLATION

Skills and plugins are installed at the project level in .claude/skills/ and .claude/plugins/. They auto-activate based on context — no manual triggering needed for most.

To add a new skill: 

claude skill install <source>/<skill-name>

To add a new plugin: 

claude plugin install <source>/<plugin-name>

LSP BINARIES

The LSP plugins require language server binaries:

Binary Install Method Notes
typescript-language-server npm install -g typescript-language-server typescript Installed globally on all dev environments
pyright pip install pyright Installed in executor Python environment
swift-lsp Requires Xcode macOS only — Martijn's local environment

CROSS_REFERENCES