Exploring MCP Apps & Adding Interactive UIs to Clients
The Real Python Podcast
Den's Move to Anthropic
Den recounts his career stops, contributions to MCP, and shift into auth and security work.
How can you move your MCP tools beyond plain text? How do you add interactive UI components directly inside chat conversations? This week on the show, Den Delimarsky from Anthropic joins us to discuss MCP Apps and interactive UIs in MCP.
Den is a member of the MCP Steering Committee and a Core Maintainer focusing on auth and security. He explains how MCP acts as a universal bridge, providing AI models with the real-time context they need. He shares insights on working with MCP Apps and moving beyond simple text to render web-based user interfaces directly in your chat window.
Den previously worked on GitHub Spec Kit, and we discuss taking advantage of spec-driven development and how to use “Skills” to remove the toil from your workflow. We also talk briefly about his podcast and his conversations about navigating careers in technology.
This episode is sponsored by AgentField.
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Topics:
- 00:00:00 – Introduction
- 00:02:17 – Den’s Background
- 00:02:53 – The Work Item Podcast
- 00:06:55 – Career Move to Anthropic
- 00:10:24 – What is Model Context Protocol (MCP)?
- 00:11:39 – MCP UI and MCP Apps
- 00:16:17 – Sponsor: AgentField
- 00:17:13 – Structuring MCP Tools
- 00:24:52 – Cloudflared & tunneling
- 00:29:59 – Reverse engineering with Ghidra MCP
- 00:35:43 – Connecting MCP tools
- 00:43:10 – Video Course Spotlight
- 00:44:23 – Spec-Driven Development & Context Management
- 00:57:23 – Leveraging Skills for Model Guidance
- 01:02:51 – What are you excited about in the world of Python?
- 01:03:42 – What do you want to learn next?
- 01:07:14 – How can people follow your work online?
- 01:07:48 – Thanks and goodbye
Show Links:
- The Work Item Podcast
- Den Delimarsky - Principal Product Engineer, Tinkerer, Nerd, Trail Explorer
- Hello, Anthropic · Den Delimarsky
- What is the Model Context Protocol (MCP)? - Model Context Protocol
- MCP Apps And Interactive UIs In MCP Clients - Den Delimarsky
- ext-apps: Official repo for spec & SDK of MCP Apps protocol
- MCP Will Never Be The Same - Render UI With MCP Apps - YouTube
- playwright-mcp: Playwright MCP server
- NationalSecurityAgency/ghidra: Software reverse engineering (SRE) framework
- GhidraMCP: MCP Server for Ghidra
- Ralph Loop – Claude Plugin - Anthropic
- Spec Kit - AI-Powered Specification-Driven Development Toolkit
- Introducing Agent Skills - Claude
- Welcome to FastMCP 2.0! - FastMCP
- uv - Astral
- Den Delimarsky (@den.dev) — Bluesky
- Den Delimarsky (@localden@mastodon.social) - Mastodon
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