TypeScript Hono MCP

npm add hono @hono/node-server @hono/mcp @modelcontextprotocol/sdk zod

pnpm add hono @hono/node-server @hono/mcp @modelcontextprotocol/sdk zod

bun add hono @hono/node-server @hono/mcp @modelcontextprotocol/sdk zod

yarn add hono @hono/node-server @hono/mcp @modelcontextprotocol/sdk zod

import { StreamableHTTPTransport } from '@hono/mcp'
import { serve } from '@hono/node-server'
import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
import { Hono } from 'hono'
import { logger } from 'hono/logger'
import { z } from 'zod'

const app = new Hono()
app.use(logger())

const mcpServer = new McpServer({
  name: 'Example',
  version: '0.0.1'
})

mcpServer.registerTool(
  'add',
  {
    description: 'Add two numbers',
    inputSchema: z.object({
      a: z.number(),
      b: z.number()
    })
  },
  async (args) => {
    return {
      content: [
        {
          type: 'text',
          content: String(args.a + args.b)
        }
      ]
    }
  }
)

app.all('/mcp', async (c) => {
  const transport = new StreamableHTTPTransport()
  await mcpServer.connect(transport)
  return transport.handleRequest(c)
})

serve({ fetch: app.fetch, port: 8787 })