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MCP Apps changedextensions/apps/overview

Nearest release: v2.1.259, published 4 hours after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 2 Sep 2026 16:29 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 22 Oct 2026 20:37 UTC.

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1212 
1313![An Excalidraw MCP App drawing a sequence diagram inside a Claude conversation](https://mintcdn.com/mcp/jbEkS7m9mV8aY_kB/images/apps/excalidraw.gif?s=c783b088f3c687e4dd4cf05c0d20f325)
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15Excalidraw MCP App, running in Claude
16 
1517## Why not just build a web app?
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1719You could build a standalone web app and send users a link. However, MCP Apps
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166168> [!NOTE]
167169>
168> MCP Apps is an extension to the [core MCP specification](/specification/latest). Host support varies by client.
170> MCP Apps is an extension to the [core MCP specification](/specification/latest.md). Host support varies by client.
169171 
170172MCP Apps are currently supported by [Claude](https://claude.ai),
171173[Claude Desktop](https://claude.ai/download),
172174[VS Code GitHub Copilot](https://code.visualstudio.com/), [Microsoft 365 Copilot](https://www.microsoft.com/microsoft-365-copilot), [Goose](https://block.github.io/goose/), [Postman](https://postman.com), [MCPJam](https://www.mcpjam.com/), and [Archestra.AI](https://www.archestra.ai/). See the
173[client matrix](/extensions/client-matrix) for the full list of extension support across clients.
175[client matrix](/extensions/client-matrix.md) for the full list of extension support across clients.
174176 
175177If you're building an MCP client and want to support MCP Apps, you have two options:
176178 
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227229 [Solid](https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/basic-server-solid),
228230 [vanilla JavaScript](https://github.com/modelcontextprotocol/ext-apps/tree/main/examples/basic-server-vanillajs)
229231 
230To start building your own MCP App, see the [build guide](/extensions/apps/build).
232To start building your own MCP App, see the [build guide](/extensions/apps/build.md).
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