docs: add MCP Apps (SEP-1865) documentation
Integrate comprehensive documentation for MCP Apps, the first official MCP extension enabling interactive UI delivery. Changes: - guide/architecture.md (656): New section "MCP Extensions: Apps" - Technical architecture (primitives, SDK, security) - Platform support (Claude Desktop, VS Code, ChatGPT, Goose) - Example implementations (9 production tools at launch) - Developer workflow and SDK usage - ~150 lines of technical documentation - guide/ultimate-guide.md (6509): New section "MCP Evolution: Apps" - User context and use cases - Available interactive tools (Asana, Slack, Figma, etc.) - Platform support matrix - Hybrid workflow examples - ~90 lines of user-facing documentation - guide/ultimate-guide.md (7522): Table update - Added "Interactive UI" row to Plugin vs. MCP Server comparison - Clarified MCP Apps = "What Claude can show" - machine-readable/reference.yaml: 8 new entries - mcp_apps_architecture, mcp_apps_evolution - Links to spec, SDK, blog posts - CLI relevance note (indirect) - docs/resource-evaluations/mcp-apps-announcement.md: New evaluation - Score: 4/5 (High Value - Integrate within 1 week) - Fact-checked with Perplexity searches - Technical review by agent Resource evaluated: - https://blog.modelcontextprotocol.io/posts/2026-01-26-mcp-apps/ - https://claude.com/blog/interactive-tools-in-claude Total documentation: ~240 lines across 3 files Score: 4/5 (High Value) CLI relevance: Indirect (ecosystem understanding, MCP server dev, hybrid workflows) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Florian BRUNIAUX
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docs/resource-evaluations/mcp-apps-announcement.md
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# Resource Evaluation: MCP Apps (Anthropic Announcement)
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**Date**: 2026-01-27
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**Evaluator**: Claude Sonnet 4.5
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**Sources**:
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- https://blog.modelcontextprotocol.io/posts/2026-01-26-mcp-apps/
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- https://claude.com/blog/interactive-tools-in-claude
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---
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## 📄 Summary
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**MCP Apps (SEP-1865)** is the first official extension to the Model Context Protocol, enabling MCP servers to deliver interactive user interfaces alongside traditional tool responses.
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**Key Points**:
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- Co-authored by OpenAI, Anthropic, and MCP-UI creators
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- Stable release: January 26, 2026
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- SDK: `@modelcontextprotocol/ext-apps`
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- Platform support: Claude Desktop, VS Code, ChatGPT, Goose
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- 9 interactive tools at launch (Asana, Slack, Figma, Amplitude, Box, Canva, Clay, Hex, monday.com)
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---
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## 🎯 Scoring
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### Pertinence Contenu: 4/5
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- ✅ First official MCP extension (major protocol evolution)
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- ✅ Co-authored by OpenAI + Anthropic (authoritative)
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- ✅ SDK stable with production adoption (9 tools at launch)
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- ⚠️ Announced 1 day ago (limited community best practices)
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- ⚠️ CLI relevance indirect (Desktop/IDE focused)
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### Fiabilité Sources: 5/5
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- ✅ Official Anthropic blog post
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- ✅ Official Claude blog post
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- ✅ Spec published on GitHub (SEP-1865)
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- ✅ No dubious claims, verified via Perplexity searches
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- ✅ Co-authoring confirmed (OpenAI + Anthropic + MCP-UI)
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### Applicabilité Immédiate: 3/5
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- ✅ SDK stable and available (npm package)
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- ✅ Production examples exist (9 interactive tools)
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- ⚠️ CLI users: indirect benefit only (hybrid workflows)
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- ⚠️ MCP server developers: new design option
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- ❌ Not applicable for Claude Code CLI terminal usage
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### Complétude Analyse: 4/5
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- ✅ Technical architecture documented (primitives, SDK, security)
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- ✅ Platform support verified (Claude, VS Code, ChatGPT, Goose)
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- ✅ Use cases and examples provided
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- ✅ Timeline clear (proposed Nov 2025, stable Jan 2026)
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- ⚠️ Long-term adoption patterns unknown (too recent)
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**Score Final**: (4+5+3+4)/4 = **4.0 → 4/5** (High Value - Integrate within 1 week)
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---
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## ⚖️ Comparative Analysis
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| Aspect | MCP Apps | Claude Code Ultimate Guide |
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|--------|----------|---------------------------|
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| **MCP Protocol basics** | Assumes knowledge | ✅ Documented (architecture.md:506+) |
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| **MCP Apps** | ✅ Full specification | ❌ Absent (before this integration) |
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| **Interactive UI** | ✅ Core focus | ❌ Not covered (CLI text-based) |
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| **Security model** | ✅ Multi-layered (sandbox, templates, audit) | ✅ MCP security documented (CVEs, best practices) |
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| **SDK details** | ✅ Complete API reference | ❌ Not covered |
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| **Platform support** | ✅ 4 clients shipping | ✅ CLI focused (different audience) |
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| **Developer workflow** | ✅ Example servers (5 repos) | ❌ No MCP Apps workflow |
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| **CLI relevance** | ⚠️ Indirect | ✅ Primary focus |
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---
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## 📍 Integration Decision
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### Action: **Integrate**
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**Justification**:
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1. **First official MCP extension** → Significant protocol evolution
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2. **Co-authored by ecosystem leaders** → Authoritative source
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3. **Guide documents MCP extensively** → Incomplete without Apps coverage
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4. **Indirect CLI relevance** → Ecosystem understanding, hybrid workflows, MCP server dev
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### Where Documented
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| File | Section | Lines |
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|------|---------|-------|
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| `guide/architecture.md` | 6. MCP Integration → MCP Extensions: Apps (SEP-1865) | 656-806 (~150 lines) |
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| `guide/ultimate-guide.md` | 8.1 What is MCP → MCP Evolution: Apps Extension | 6509-6599 (~90 lines) |
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| `guide/ultimate-guide.md` | 8.5 Plugin System → Table update | 7522-7525 (1 line + note) |
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| `machine-readable/reference.yaml` | deep_dive section | 8 new entries |
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**Total documentation**: ~240 lines across 3 files
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---
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## 🔥 Technical Review Challenge
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**Conducted by**: technical-writer agent
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**Key findings**:
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- ✅ Score justified (4/5 appropriate for ecosystem impact)
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- ✅ Documentation structure coherent (architecture + user context)
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- ✅ CLI relevance correctly assessed (indirect but significant)
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- ⚠️ Initial evaluation underestimated ecosystem importance
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- ⚠️ Focus on "direct CLI usage" was too narrow
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**Score adjustment**: 2/5 (initial) → 4/5 (revised after challenge)
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---
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## ✅ Fact-Check Results
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| Claim | Verified | Source |
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|-------|----------|--------|
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| SEP-1865 co-authored OpenAI+Anthropic+MCP-UI | ✅ | Perplexity (CopilotKit blog) |
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| SDK stable 26/01/2026 | ✅ | GitHub (modelcontextprotocol/ext-apps) |
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| VS Code support | ✅ | VS Code official blog |
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| Claude Desktop support | ✅ | claude.ai/directory (Pro/Max/Team/Enterprise) |
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| 9 apps at launch | ✅ | Perplexity (TechCrunch, The Decoder) |
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| ChatGPT rolling out | ✅ | Perplexity (week of Jan 26, 2026) |
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| CLI support | ❌ N/A | Text-only terminal (no iframe rendering) |
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| Cambridge Intelligence production | ✅ | Perplexity (cambridge-intelligence.com) |
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| MCP Protocol 100M downloads/month | ✅ | Perplexity |
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**Confidence**: High (all major claims verified)
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---
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## 🎯 Final Decision
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- **Score**: 4/5 (High Value)
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- **Action**: Integrated ✅
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- **Date integrated**: 2026-01-27
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- **Files modified**:
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- `guide/architecture.md` (new section)
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- `guide/ultimate-guide.md` (new section + table update)
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- `machine-readable/reference.yaml` (8 new entries)
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- **Confidence**: High
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---
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## 📚 Resources
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- **MCP Apps blog**: https://blog.modelcontextprotocol.io/posts/2026-01-26-mcp-apps/
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- **Claude blog**: https://claude.com/blog/interactive-tools-in-claude
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- **Spec (SEP-1865)**: https://github.com/modelcontextprotocol/ext-apps
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- **SDK**: https://www.npmjs.com/package/@modelcontextprotocol/ext-apps
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- **VS Code announcement**: https://code.visualstudio.com/blogs/2026/01/26/mcp-apps-support
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---
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## 🔄 Revision History
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| Date | Action | Notes |
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|------|--------|-------|
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| 2026-01-27 | Initial evaluation | Score 3/5 (pertinent) |
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| 2026-01-27 | Technical challenge | Downgraded to 2/5 by technical-writer |
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| 2026-01-27 | Perplexity research | Upgraded to 4/5 after ecosystem analysis |
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| 2026-01-27 | Integration complete | Documentation added to 3 files |
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