
xsmcp
🤖📎 Extra-Small MCP SDK für schnelle Client/Server-Builds.
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xsMCP
extra-small MCP SDK for quick client/server builds.
About
🚧 This project is under active development, stay tuned!
Why is there this project?
@modelcontextprotocol/sdk
is large and has dependencies on libraries like zod
, express
, etc. that you probably don't even want to use.
Like xsAI, xsMCP does not force you to use a particular server or schema library and is very small.
Roadmap
Our current target is Streamable HTTP Client / Server, Stdio have lower priority.
Compatibility
xsMCP v0.1 is targeted to be compatible with the 2025-03-26
revision and is not backward compatible.
HTTP Server Structure
@xsmcp/server-http
is based on Web Standards, not Express.
import { createServerAdapter } from '@whatwg-node/server'
import { createHttpServer } from '@xsmcp/server-http'
import { createServer } from 'node:http'
const server = createHttpServer({ ...options })
// (req: Request) => Promise<Response>
type ServerFetch = typeof server.fetch
// node.js
const httpServer = createServer(createServerAdapter(server.fetch))
httpServer.listen(3000)
// next.js
export const POST = router.fetch
// cloudflare workers, bun
export default server
It can be used as a server on its own or with hono
, elysia
and itty-router
for more features:
import { createHttpServer } from '@xsmcp/server-http'
import { Elysia } from 'elysia'
import { Hono } from 'hono'
import { AutoRouter } from 'itty-router'
const server = createHttpServer({ ...options })
// hono
new Hono()
.post('/mcp', ({ req }) => server.fetch(req.raw))
// elysia
new Elysia()
.post('/mcp', ({ request }) => server.fetch(request))
// itty-router
AutoRouter()
.post('/mcp', req => server.fetch(req))
At the same time, it does not depends on any server framework thus minimizing the size.
For simplicity reasons, this server only returns JSON Response, not SSE.
License
Third Party Licenses
This project partially copies code from the following projects:
Project | License |
---|---|
modelcontextprotocol/specification | MIT |
modelcontextprotocol/servers | MIT |
modelcontextprotocol/typescript-sdk | MIT |
crouchcd/pkce-challenge | MIT |
denoland/std | MIT |
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Reviews

user_feZpSVlS
As a dedicated user of MCP applications, I must say that the xsmcp by moeru-ai is an outstanding addition. The smooth integration and user-friendly interface make it a joy to use. If you are seeking reliability and efficiency, I highly recommend xsmcp. Exceptional work by moeru-ai! Check it out here: https://github.com/moeru-ai/xsmcp.