v3.1.0: Remove obsolete adapters, simplify for Agent Skills standard

- Remove for-cursor.mdc, for-github-copilot.md, for-openai-codex-cli.md,
  for-gemini-cli.md — all these tools now support Agent Skills natively
- Keep only system-prompt.md (universal) and for-windsurf.md (not yet on standard)
- Simplify installer: remove Cursor/Copilot/Codex agents, covered by --agents
- Add .claude-plugin/ manifests for Claude Code plugin marketplace
- Move prompt-architect/ to skills/prompt-architect/ for plugin system
- Add @clack/prompts interactive multi-agent installer
- Add build-skill.js to create .skill zip for ChatGPT upload
- Rename package to @ckelsoe/prompt-architect
- Add MIGRATION.md, update README, CHANGELOG, all docs
- Delete stale ckelsoe-claude-skill-prompt-architect-1.0.3.tgz

Author: ckelsoe

.claude-plugin/marketplace.json

@@ -0,0 +1,20 @@
+{
+  "name": "prompt-architect-marketplace",
+  "owner": {
+    "name": "Charles Kelsoe",
+    "email": "charles@kelsoe.com"
+  },
+  "metadata": {
+    "description": "Prompt engineering skill using 27 research-backed frameworks across 7 intent categories"
+  },
+  "plugins": [
+    {
+      "name": "prompt-architect",
+      "source": "./",
+      "description": "Analyzes and improves prompts using 27 research-backed frameworks. Intent-based selection routes to the right framework — from ultra-minimal (APE) to agentic (ReAct).",
+      "version": "3.1.0",
+      "keywords": ["prompt-engineering", "prompt-frameworks", "agent-skills"],
+      "category": "productivity"
+    }
+  ]
+}

.claude-plugin/plugin.json

@@ -0,0 +1,18 @@
+{
+  "name": "prompt-architect",
+  "description": "27-framework prompt engineering skill for analyzing and improving prompts across 7 intent categories",
+  "version": "3.1.0",
+  "author": {
+    "name": "Charles Kelsoe",
+    "email": "charles@kelsoe.com"
+  },
+  "homepage": "https://github.com/ckelsoe/prompt-architect",
+  "repository": "https://github.com/ckelsoe/prompt-architect",
+  "license": "MIT",
+  "keywords": [
+    "prompt-engineering",
+    "prompt-frameworks",
+    "prompt-improvement",
+    "agent-skills"
+  ]
+}

.github/workflows/publish.yml

@@ -12,11 +12,11 @@ jobs:
     permissions:
       contents: write  # For creating GitHub releases
       id-token: write  # For npm provenance
-    
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-      
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
@@ -28,32 +28,42 @@ jobs:
 
       - name: Install dependencies
         run: npm ci || npm install
-      
+
       - name: Run tests
         run: npm test
-      
+
       - name: Validate skill structure
         run: npm run validate
-      
+
+      - name: Build .skill file
+        run: npm run build:skill
+
       - name: Publish to npm
         run: npm publish --provenance --access public
-      
+
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v1
         with:
           name: Release ${{ github.ref_name }}
+          files: prompt-architect.skill
           body: |
             See [CHANGELOG.md](https://github.com/${{ github.repository }}/blob/main/CHANGELOG.md) for details.
-            
+
             ## Installation
-            
+
+            **npm (interactive multi-agent installer):**
             ```bash
-            npm install -g @ckelsoe/claude-skill-prompt-architect
-            prompt-architect-install
+            npm install -g @ckelsoe/prompt-architect
+            npx @ckelsoe/prompt-architect
+            ```
+
+            **ChatGPT / Gemini CLI / Agent Skills:**
+            Download `prompt-architect.skill` below and upload to your tool.
+
+            **Claude Code Plugin:**
+            ```
+            /plugin marketplace add ckelsoe/prompt-architect
+            /plugin install prompt-architect@prompt-architect-marketplace
             ```
-            
-            ## What's Changed
-            
-            Check the [CHANGELOG](https://github.com/${{ github.repository }}/blob/main/CHANGELOG.md) for full details.
           draft: false
           prerelease: false

.npmignore

@@ -3,6 +3,9 @@
 .gitignore
 .gitattributes
 
+# Build artifacts
+*.skill
+
 # GitHub
 .github/
 

CHANGELOG.md

@@ -5,6 +5,32 @@ All notable changes to the Prompt Architect Claude Code skill will be documented
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.0.0] - 2026-03-24
+
+### Breaking Changes
+- **Package renamed**: `@ckelsoe/claude-skill-prompt-architect` → `@ckelsoe/prompt-architect`
+- **Directory restructured**: `prompt-architect/` moved to `skills/prompt-architect/` for Claude Code plugin system compatibility
+
+### Added
+- **Claude Code Plugin System support**: `.claude-plugin/plugin.json` and `marketplace.json` — install via `/plugin marketplace add` and `/plugin install`
+- **Gemini CLI support**: Native Agent Skills compatibility. Install via `gemini skills install`
+- **Agent Skills standard compliance** (agentskills.io): Added `license`, `compatibility`, and `metadata` fields to SKILL.md frontmatter. Works with 30+ compatible agents including Cursor, Copilot, Kiro, Roo Code, Amp, OpenHands, and more
+- **Interactive multi-agent installer**: Detects installed AI agents (Claude Code, Gemini CLI, Cursor, Copilot, Windsurf, Codex) and presents a selection UI using @clack/prompts
+- **Universal install path**: `~/.agents/skills/` for Agent Skills standard compatible tools
+- **CLI flags**: `--all`, `--claude`, `--gemini`, `--agents`, `--cursor`, `--copilot`, `--windsurf`, `--codex`, `--yes`
+- **Gemini CLI adapter**: `adapters/for-gemini-cli.md` with installation instructions
+- **Append-mode safety**: Marker comments prevent duplicate content when appending adapters to existing files
+- **MIGRATION.md**: Step-by-step guide for migrating from the old package name
+
+### Changed
+- `scripts/install.js` fully rewritten as multi-agent installer with @clack/prompts UI
+- `scripts/test.js` expanded from 11 to 19 tests (plugin manifests, Agent Skills compliance, all adapters)
+- `scripts/validate-skill.js` now validates plugin manifest and cross-checks version consistency
+- Added `@clack/prompts` as a runtime dependency (previously zero dependencies)
+- Non-interactive postinstall still defaults to Claude Code only for backwards compatibility
+
+---
+
 ## [2.1.3] - 2026-03-10
 
 ### Fixed

MIGRATION.md

@@ -0,0 +1,66 @@
+# Migration Guide: v2.x → v3.0
+
+## Package Rename
+
+The npm package has been renamed:
+
+- **Old:** `@ckelsoe/claude-skill-prompt-architect`
+- **New:** `@ckelsoe/prompt-architect`
+
+The old name included "claude-skill" which was misleading — the skill now works with 30+ AI agents via the Agent Skills standard, not just Claude Code.
+
+## How to Migrate
+
+### 1. Uninstall the old package
+
+```bash
+npm uninstall -g @ckelsoe/claude-skill-prompt-architect
+```
+
+### 2. Install the new package
+
+```bash
+npm install -g @ckelsoe/prompt-architect
+```
+
+The interactive installer will detect your AI agents and let you choose where to install.
+
+### 3. (Optional) Clean up old skill files
+
+If you previously had the skill installed at `~/.claude/skills/prompt-architect/`, the new installer will overwrite it automatically. No manual cleanup needed.
+
+## What Changed
+
+### Directory Structure
+
+```
+# Before (v2.x)
+prompt-architect/SKILL.md
+
+# After (v3.0)
+skills/prompt-architect/SKILL.md
+.claude-plugin/plugin.json
+.claude-plugin/marketplace.json
+```
+
+### New Install Methods
+
+| Method | Command |
+|--------|---------|
+| npm (interactive) | `npm install -g @ckelsoe/prompt-architect` |
+| Claude Code Plugin | `/plugin marketplace add ckelsoe/prompt-architect` |
+| Gemini CLI | `gemini skills install https://github.com/ckelsoe/prompt-architect.git` |
+| Multi-agent | `npx @ckelsoe/prompt-architect --all` |
+
+### The skill itself is unchanged
+
+The `SKILL.md` content, all 27 frameworks, reference docs, and templates are identical. Only the packaging and distribution have changed.
+
+## GitHub Repository
+
+The repository has also been renamed:
+
+- **Old:** `github.com/ckelsoe/claude-skill-prompt-architect`
+- **New:** `github.com/ckelsoe/prompt-architect`
+
+GitHub automatically redirects from the old URL, so existing links and git remotes continue to work.