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Merged
merged 5 commits into from
Jul 27, 2025
Merged

mcp/examples: Make example more usable. #160

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7fa7efa
Make example more usable.
wkoszek Jul 23, 2025
8692d3a
Better way to show usage.
wkoszek Jul 23, 2025
5f2b816
Simplify
wkoszek Jul 23, 2025
41599ae
Merge branch 'main' into ex1
wkoszek Jul 24, 2025
7585391
Fix formatting.
wkoszek Jul 26, 2025
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25 changes: 19 additions & 6 deletions examples/sse/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,13 +7,18 @@ package main
import (
"context"
"flag"
"fmt"
"log"
"net/http"
"os"

"github.com/modelcontextprotocol/go-sdk/mcp"
)

var httpAddr = flag.String("http", "", "use SSE HTTP at this address")
var (
host = flag.String("host", "localhost", "host to listen on")
port = flag.String("port", "8080", "port to listen on")
)

type SayHiParams struct {
Name string `json:"name"`
Expand All @@ -28,19 +33,27 @@ func SayHi(ctx context.Context, cc *mcp.ServerSession, params *mcp.CallToolParam
}

func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: %s [options]\n\n", os.Args[0])
fmt.Fprintf(os.Stderr, "This program runs MCP servers over SSE HTTP.\n\n")
fmt.Fprintf(os.Stderr, "Options:\n")
flag.PrintDefaults()
fmt.Fprintf(os.Stderr, "\nEndpoints:\n")
fmt.Fprintf(os.Stderr, " /greeter1 - Greeter 1 service\n")
fmt.Fprintf(os.Stderr, " /greeter2 - Greeter 2 service\n")
os.Exit(1)
}
flag.Parse()

if httpAddr == nil || *httpAddr == "" {
log.Fatal("http address not set")
}
addr := fmt.Sprintf("%s:%s", *host, *port)

server1 := mcp.NewServer(&mcp.Implementation{Name: "greeter1"}, nil)
mcp.AddTool(server1, &mcp.Tool{Name: "greet1", Description: "say hi"}, SayHi)

server2 := mcp.NewServer(&mcp.Implementation{Name: "greeter2"}, nil)
mcp.AddTool(server2, &mcp.Tool{Name: "greet2", Description: "say hello"}, SayHi)

log.Printf("MCP servers serving at %s", *httpAddr)
log.Printf("MCP servers serving at %s", addr)
handler := mcp.NewSSEHandler(func(request *http.Request) *mcp.Server {
url := request.URL.Path
log.Printf("Handling request for URL %s\n", url)
Expand All @@ -53,5 +66,5 @@ func main() {
return nil
}
})
log.Fatal(http.ListenAndServe(*httpAddr, handler))
log.Fatal(http.ListenAndServe(addr, handler))
}
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