V3: MCP Apps extension — infrastructure dashboard UI inside the client

[StuMason]

Why (this is the fun one)

The MCP Apps extension (io.modelcontextprotocol/ui, shipping official with spec 2026-07-28) lets a server return sandboxed iframe HTML that renders inside the chat client. Client support is already broad: Claude web/Desktop, VS Code, Cursor, ChatGPT, Goose, Postman.

For coolify-mcp that means a real infrastructure dashboard in the conversation:

• get_infrastructure_overview → rendered panel: servers with health dots, app/database/service counts, running/stopped/unhealthy breakdown
• diagnose_app → status card: deployment timeline, health checks, log tail
• list_deployments → live deploy queue with statuses
• find_issues → triage board grouped by severity

All backed by tools that already exist — the extension is a presentation layer.

Constraints

• UI is sandboxed iframe HTML; strict CSP (self-contained HTML, no external fetches) — matches how we'd want to build it anyway
• Data flows through the existing masked responses — the dashboard inherits the Secure-by-Default posture for free (never render reveal: true data)
• Needs SDK v2-era wiring: @modelcontextprotocol/ext-apps (already on npm)

Sequencing

Blocked on #259 (SDK v2). Best tackled AFTER #262 (tasks) so deploy tiles can show live progress. Suggested V3.1 rather than V3.0 — ship the migration first, then the shiny.

References

• Extension: https://modelcontextprotocol.io/extensions/client-matrix
• Release: https://blog.modelcontextprotocol.io/posts/2026-07-28-release-candidate/

🤖 Generated with Claude Code