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MCP Apps open a new world of possibilities for interactions in AI chats. While SEP-1865 defines how they work, this talk is about how to build them well.
We'll share the patterns emerging from real MCP Apps development: understanding the data flow between servers, apps, and models — including the interplay of tool inputs and results (streamed or complete), when to use structuredContent versus _meta, how model context updates propagate, how to create tools visible to your app only, etc.
Beyond the protocol mechanics, we'll cover practical concerns: building apps that work across hosts, handling authenticated data at scale, managing state persistence, and keeping heavy visualizations performant. We'll also walk through the common pitfalls — the silent failures and subtle bugs that waste hours — and the debugging workflows and tools that surface them.
You'll leave with tricks and patterns you can apply immediately and a mental model for reasoning about MCP Apps architecture.
Co-author of the MCP Apps extension, Olivier joined the MCP team at Anthropic in 2025, after working at Google (mostly AdSense) for 13 years. In recent years, he contributed to OSS projects such as OpenSCAD & llama.cpp, and is particularly excited by tool calling as the next interoperability... Read More →
