Hi @alexbjorlig, that's a really thoughtful discussion you bring up.

I'll have to dig in further into the discussion to answer other things but Performance & Scalability wise Vercel should be perfect.

I think https://github.com/modelcontextprotocol/specification/pull/206 will open the possibility for Vercel functions.

Let me try making a simple MCP server and host on Vercel. In the meantime, I'm eager to see what others have to pitch in.

Hi @alexbjorlig, I tried building a simple MCP server. It was my first time and had much fun learnings. It worked fine locally but didn't work as expected once hosted on Vercel.

I think the reason is that the TS SDK is currently on the way to support https://github.com/modelcontextprotocol/typescript-sdk/pull/266, which will then open the way for Stateless MCP servers.

GitHub

Server implementation of Streamable HTTP transport by ihrpr · Pull Request #266 · modelcontextprotocol/typescript-sdk

Introduces support for the new Streamable HTTP transport on the server side. Builds on the work of @gylove1994 in #230. To do Remove distinction around local sessions Follow ups Resumability Se...

I'll watch the PR and try again once this has been merged.

That's amazing @anshumanb - thank you so much for looking into this.

Things are moving fast, seems like the PR is already merged 🫣

Hi @alexbjorlig, you're right. I got the merge notification today. Will take a look as soon as possible.

Hi @alexbjorlig, I tried in the SDK and checked it's changelog. I think there are more tasks in the follow up: https://github.com/modelcontextprotocol/typescript-sdk/pull/290.

GitHub

Client implementation of Streamable HTTP transport by ihrpr · Pull Request #290 · modelcontextprotocol/typescript-sdk

Introduces support for streamable http transport on client. Server was implemented in #266 TO DO Tests with examples and integration in the stacked PRs Follow ups Session management Refactor au...

Ok, let's await the PR and see what happens then

The PR got merged. But the docs and examples are not updated to explain how to use HTTP without SSE.

I'm keeping an eye on the docs and the repository to see if something comes up.

I'm also super excited to showcase my MCP server hosted on Vercel!

Could be epic - would love to see a guide in sveltekit on Vercel :)

Have you seen this example?

https://github.com/vercel-labs/mcp-for-next.js

GitHub

GitHub - vercel-labs/mcp-for-next.js

Contribute to vercel-labs/mcp-for-next.js development by creating an account on GitHub.

Hi @jacobparis, yes. It is a good starting point. I made something similar for BMI calculation. But this still uses SSE. I'm waiting for the docs update about serverless hosting so it works just with POST HTTP requests without keeping the connections open.

yeah the lack of stateless streamable HTTP in the initial spec was a big miss, super happy to see they're coming around on that

It'll take a bit for all the MCP clients to support streamables but then I think this ecosystem will really take off

Hi @alexbjorlig, we've released a new package to support creating MCP servers with stateless HTTP transport. You can learn more about it in our changelog: https://vercel.com/changelog/mcp-server-support-on-vercel.

Vercel

MCP server support on Vercel - Vercel

Run MCP servers on with Next.js or Node.js in your Vercel project with 1st class support for Anthropic's MCP SDK

@anshumanb this looks very interesting.

The changelog is very short 😅

We are currenlty using Svetlekit, so waiting for an adapter there.

Does Vercel imagine this package would wrap everything related to MCP - or are anthropic imports still needed?

I see. I think the package provides abstraction for creating a serverless function route handler for your MCP server so you should be able to use it in any serverless function (TS/JS) hosted on Vercel.

I can try making an example app when I get a chance.

Edit: Currently this package has out of the box support for Next.js. Other frameworks to follow.

Hi @anshumanb - if you have the time/energi to make a POC with Sveltekit it would be amazing 🎊

Hi @alexbjorlig, we don't yet have a Svelte-specific adapter, but I've got something else that is equally good. We have this working example with Vercel Functions, which you can implement in any project irrespective of the framework.

I'll surely keep an eye out for when we have a SvelteKit adapter and share a POC here.