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Build an MCP App changedextensions/apps/build

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Upstream edited this page at 7 Jul 2026 19:26 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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55## Prerequisites
66 
77You'll need [Node.js](https://nodejs.org/en/download) 18 or higher. Familiarity
8with [MCP tools](/specification/latest/server/tools) and
9[resources](/specification/latest/server/resources) is recommended since MCP
8with [MCP tools](/specification/latest/server/tools.md) and
9[resources](/specification/latest/server/resources.md) is recommended since MCP
1010Apps combine both primitives. Experience with the
1111[MCP TypeScript SDK](https://github.com/modelcontextprotocol/typescript-sdk)
1212will help you better understand the server-side patterns.
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9898 
9999![Creating a new MCP App with Claude Code](https://mintcdn.com/mcp/GU_E-622SLWFdCrP/images/quickstart-apps/create-mcp-app-skill.gif?s=6c3a3b8a7590b5e97b5c3d8480a9ab12)
100100 
101Creating a new MCP App with Claude Code
102 
101103**3. Run your app**
102104 
103105```bash macOS/Linux theme={null}
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118120 
119121![Testing the color picker in Claude](https://mintcdn.com/mcp/GU_E-622SLWFdCrP/images/quickstart-apps/test-color-picker.gif?s=09413b99bc31d7edc7f9aa22df4faa6a)
120122 
123Testing the color picker in Claude
124 
121125### Manual setup
122126 
123127If you're not using an AI coding agent, or prefer to understand the setup
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426430 
427431![Adding a custom connector in Claude](https://mintcdn.com/mcp/GU_E-622SLWFdCrP/images/quickstart-apps/add-custom-connector.gif?s=c4ec0750413ff7575c7f9492e2713212)
428432 
433Adding a custom connector in Claude
434 
429435### Testing with the basic-host
430436 
431437The `ext-apps` repository includes a test host for development. Clone the repo and
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461467app and verify that tool calls work correctly.
462468 
463469![Example of the QR code MCP App running with the basic host](https://mintcdn.com/mcp/GU_E-622SLWFdCrP/images/quickstart-apps/qr-code-server.gif?s=48a3b47239b8394017c0949162d63de9)
470 
471Testing the QR code MCP App with the basic host
464472 
465473## Learn more
466474 
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