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Kiln — Raw code refined into polished design. A marketplace of Claude Code plugins for design, performance, code quality, and learning workflows.
npx claudepluginhub timbrinded/kilnSwiftUI design excellence — HIG-compliant code review, generation, and iteration with 40 enforceable rules, accessibility checks, and modern API enforcement.
Language-agnostic performance optimization skill distilled from Google's Abseil performance wisdom. Covers measurement methodology, optimization techniques, and cross-language patterns for C++, Rust, and TypeScript.
UI design reviewer distilled from Refactoring UI principles. Reviews screenshots, code, and descriptions for hierarchy, spacing, typography, color, depth, and polish — with concrete CSS fixes and named anti-patterns.
Post-generation code quality cleanup. Reviews git diffs for AI-generated verbosity, unnecessary state, defensive coding, and complexity — then applies concrete simplifications.
Claude Code marketplace entries for the plugin-safe Antigravity Awesome Skills library and its compatible editorial bundles.
Production-ready workflow orchestration with 84 marketplace plugins, 192 local specialized agents, and 156 local skills - optimized for granular installation and minimal token usage
Directory of popular Claude Code extensions including development tools, productivity plugins, and MCP integrations
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Raw code refined into polished design.

Kiln is a marketplace of Claude Code plugins for code quality and intelligent tooling. Design plugins encode platform-specific guidelines as machine-enforceable rules. Performance plugins distill expert optimization knowledge into actionable guidance. API plugins provide structured guides for web research and data enrichment APIs.
| Plugin | Category | Description |
|---|---|---|
| swift-design | Design | 40 HIG rules for SwiftUI — letter grading, visual review, accessibility checks, modern API enforcement |
| ui-refactor | Design | Refactoring UI principles — review screenshots, CSS, and Tailwind for hierarchy, spacing, typography, color, depth, and polish |
| performance-optimization | Performance | Abseil-derived optimization guidance — measurement methodology, cross-language patterns for C++, Rust, and TypeScript |
In the Claude Code interactive terminal:
/plugin marketplace add https://github.com/timbrinded/kiln.git
Browse available plugins:
/plugin
Navigate to the Discover tab, select a plugin, and choose a scope (User, Project, or Local).
Or install directly:
/plugin install swift-design@kiln
/plugin install ui-refactor@kiln
/plugin install performance-optimization@kiln
claude --plugin-dir /path/to/kiln/plugins/swift-design
claude --plugin-dir /path/to/kiln/plugins/ui-refactor
claude --plugin-dir /path/to/kiln/plugins/performance-optimization
If you've cloned the repo locally:
/plugin marketplace add ./path/to/kiln
Each plugin lives in plugins/<name>/ as a self-contained Claude Code plugin:
plugins/<name>/
├── .claude-plugin/
│ └── plugin.json # Plugin manifest (name, version, description)
├── agents/ # Autonomous review agents
├── commands/ # Slash commands (/review, /generate, etc.)
├── skills/ # Skills with progressive disclosure
│ └── <name>/
│ ├── SKILL.md
│ └── references/
└── README.md
Then register it in .claude-plugin/marketplace.json at the repo root:
{
"name": "<name>",
"source": "./plugins/<name>",
"description": "...",
"version": "0.1.0",
"author": { "name": "timbo" },
"category": "design",
"license": "MIT",
"keywords": []
}
MIT