1 reply

Exposing McpServer as a web fetch handler for framework integration

effect

Hi! I'm trying to integrate

@effect/ai

@effect/ai

's McpServer with TanStack Start API routes (though this would apply to any framework that uses standard web Request/Response handlers).

I see that

McpServer.layerHttp

McpServer.layerHttp

and

McpServer.layerHttpRouter

McpServer.layerHttpRouter

exist for running the MCP server over HTTP, but they seem designed to run as a standalone Effect HTTP server rather than being mountable into an existing web framework.

Is there a way to export the McpServer as a standard web fetch handler, something like:

const handler = McpServer.toWebHandler({
  name: "My Server",
  version: "1.0.0"
})

// Then use in TanStack/Next.js/Hono/etc:
export const POST = handler

const handler = McpServer.toWebHandler({
  name: "My Server",
  version: "1.0.0"
})

// Then use in TanStack/Next.js/Hono/etc:
export const POST = handler

Or alternatively, a way to get an

HttpApp

HttpApp

from the McpServer that I could then convert using

HttpApp.toWebHandler

HttpApp.toWebHandler

?

If this isn't currently possible, would it be a reasonable feature request? Happy to open an issue if so.

Thanks!

---

Feel free to adjust the tone or add any additional context about your specific use case!

Effect Community•2mo ago•

1 reply

JimZer

Exposing McpServer as a web fetch handler for framework integration

effect

Hi! I'm trying to integrate

@effect/ai

@effect/ai

's McpServer with TanStack Start API routes (though this would apply to any framework that uses standard web Request/Response handlers).

I see that

McpServer.layerHttp

McpServer.layerHttp

and

McpServer.layerHttpRouter

McpServer.layerHttpRouter

const handler = McpServer.toWebHandler({
  name: "My Server",
  version: "1.0.0"
})

// Then use in TanStack/Next.js/Hono/etc:
export const POST = handler

const handler = McpServer.toWebHandler({
  name: "My Server",
  version: "1.0.0"
})

// Then use in TanStack/Next.js/Hono/etc:
export const POST = handler

Or alternatively, a way to get an

HttpApp

HttpApp

from the McpServer that I could then convert using

HttpApp.toWebHandler

HttpApp.toWebHandler

Exposing McpServer as a web fetch handler for framework integration

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