diff --git a/README.md b/README.md
index 0efa4e94..904295f2 100644
--- a/README.md
+++ b/README.md
@@ -108,120 +108,52 @@ The following plugins have been archived and are not actively maintained. They r
 
 _To restore an archived plugin, move its folder from `.archive/` to the root directory and register it in `marketplace.json`._
 
-## 🖥️ Supported Platforms
+## 🖥️ Supported Platform
 
-Ring works across multiple AI development platforms:
+Ring is currently distributed as a **Claude Code plugin marketplace**.
+The skills remain agent-agnostic, but the legacy multi-platform installer that copied and transformed assets for Factory AI, Cursor, Cline, Codex, and OpenCode has been removed.
 
-| Platform        | Format      | Status             | Features                        |
-| --------------- | ----------- | ------------------ | ------------------------------- |
-| **Claude Code** | Native      | ✅ Source of truth | Skills, agents, hooks           |
-| **Factory AI**  | Transformed | ✅ Supported       | Droids, skills                  |
-| **Cursor**      | Transformed | ✅ Supported       | Skills, agents                  |
-| **Cline**       | Transformed | ✅ Supported       | Prompts                         |
-
-**Transformation Notes:**
-
-- Claude Code receives Ring content in its native format
-- Factory AI: `agents` → `droids` terminology
-- Cursor: Skills → ~/.cursor/skills/, Agents → ~/.cursor/agents/
-- Cline: All content → structured prompts
-
-**Platform-Specific Guides:**
-
-See the [installer README](installer/) for platform-specific setup and transformation details.
+| Platform        | Format | Status             | Features              |
+| --------------- | ------ | ------------------ | --------------------- |
+| **Claude Code** | Native | ✅ Source of truth | Skills, agents, hooks |
 
 ## 🚀 Quick Start
 
-### Multi-Platform Installation (Recommended)
-
-The Ring installer automatically detects installed platforms and transforms content appropriately.
-
-**Linux/macOS/Git Bash:**
+### Claude Code Plugin Marketplace
 
 ```bash
-# Interactive installer (auto-detects platforms)
-curl -fsSL https://raw.githubusercontent.com/lerianstudio/ring/main/install-ring.sh | bash
+# Add the Ring marketplace
+claude plugin marketplace add lerianstudio/ring
 
-# Or clone and run locally
-git clone https://github.com/lerianstudio/ring.git ~/ring
-cd ~/ring
-./installer/install-ring.sh
+# Install the required core plugin
+claude plugin install ring-default
 ```
 
-**Windows PowerShell:**
-
-```powershell
-# Interactive installer (auto-detects platforms)
-irm https://raw.githubusercontent.com/lerianstudio/ring/main/install-ring.ps1 | iex
-
-# Or clone and run locally
-git clone https://github.com/lerianstudio/ring.git $HOME\ring
-cd $HOME\ring
-.\installer\install-ring.ps1
-```
-
-### Direct Platform Installation
-
-Install to specific platforms without the interactive menu:
+Optional plugin packs:
 
 ```bash
-# Install to Claude Code only (native format)
-./installer/install-ring.sh install --platforms claude
-
-# Install to Factory AI only (droids format)
-./installer/install-ring.sh install --platforms factory
-
-# Install to multiple platforms
-./installer/install-ring.sh install --platforms claude,cursor,cline
-
-# Install to all detected platforms
-./installer/install-ring.sh install --platforms auto
-
-# Dry run (preview changes without installing)
-./installer/install-ring.sh install --platforms auto --dry-run
+claude plugin install ring-dev-team
+claude plugin install ring-pm-team
+claude plugin install ring-tw-team
 ```
 
-### Installer Commands
+Update installed plugins:
 
 ```bash
-# List installed platforms and versions
-./installer/install-ring.sh list
-
-# Update existing installation
-./installer/install-ring.sh update
-
-# Check for available updates
-./installer/install-ring.sh check
-
-# Sync (update only changed files)
-./installer/install-ring.sh sync
-
-# Uninstall from specific platform
-./installer/install-ring.sh uninstall --platforms cursor
-
-# Detect available platforms
-./installer/install-ring.sh detect
+claude plugin marketplace update ring
+claude plugin update ring-default
+claude plugin update ring-dev-team
+claude plugin update ring-pm-team
+claude plugin update ring-tw-team
 ```
 
-### Claude Code Plugin Marketplace
-
-For Claude Code users, you can also install from the marketplace:
+You can also install from the Claude Code UI:
 
 - Open Claude Code
 - Go to Settings → Plugins
 - Search for "ring"
 - Click Install
 
-### Manual Installation (Claude Code only)
-
-```bash
-# Clone the marketplace repository
-git clone https://github.com/lerianstudio/ring.git ~/ring
-
-# Skills auto-load at session start via hooks
-# No additional configuration needed for Claude Code
-```
-
 ### Code Analysis Pipeline
 
 The codereview pipeline uses [Mithril](https://github.com/LerianStudio/mithril), an external code analysis tool installed via `go install`. Mithril performs static analysis, AST extraction, call graph generation, and context compilation for AI-assisted code review.
@@ -613,7 +545,7 @@ ring/                                  # Monorepo root
 - [CLAUDE.md](CLAUDE.md) - Repository guide for Claude Code
 - [MANUAL.md](MANUAL.md) - Quick reference for all skills, agents, and workflows
 - [ARCHITECTURE.md](ARCHITECTURE.md) - Architecture diagrams and component relationships
-- [Installer](installer/) - Multi-platform installation and migration
+- [.claude-plugin/marketplace.json](.claude-plugin/marketplace.json) - Plugin marketplace manifest and versions
 
 ## 🎯 Philosophy