90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"net/http"
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"net/url"
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"os"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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var httpAddr = flag.String("http", "", "if set, use streamable HTTP at this address, instead of stdin/stdout")
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type HiArgs struct {
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Name string `json:"name" jsonschema:"the name to say hi to"`
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}
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func SayHi(ctx context.Context, ss *mcp.ServerSession, params *mcp.CallToolParamsFor[HiArgs]) (*mcp.CallToolResultFor[struct{}], error) {
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return &mcp.CallToolResultFor[struct{}]{
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Content: []mcp.Content{
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&mcp.TextContent{Text: "Hi " + params.Arguments.Name},
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},
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}, nil
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}
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func PromptHi(ctx context.Context, ss *mcp.ServerSession, params *mcp.GetPromptParams) (*mcp.GetPromptResult, error) {
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return &mcp.GetPromptResult{
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Description: "Code review prompt",
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Messages: []*mcp.PromptMessage{
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{Role: "user", Content: &mcp.TextContent{Text: "Say hi to " + params.Arguments["name"]}},
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},
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}, nil
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}
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func main() {
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flag.Parse()
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server := mcp.NewServer(&mcp.Implementation{Name: "greeter"}, nil)
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mcp.AddTool(server, &mcp.Tool{Name: "greet", Description: "say hi"}, SayHi)
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server.AddPrompt(&mcp.Prompt{Name: "greet"}, PromptHi)
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server.AddResource(&mcp.Resource{
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Name: "info",
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MIMEType: "text/plain",
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URI: "embedded:info",
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}, handleEmbeddedResource)
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if *httpAddr != "" {
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handler := mcp.NewStreamableHTTPHandler(func(*http.Request) *mcp.Server {
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return server
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}, nil)
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log.Printf("MCP handler listening at %s", *httpAddr)
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http.ListenAndServe(*httpAddr, handler)
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} else {
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t := mcp.NewLoggingTransport(mcp.NewStdioTransport(), os.Stderr)
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if err := server.Run(context.Background(), t); err != nil {
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log.Printf("Server failed: %v", err)
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}
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}
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}
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var embeddedResources = map[string]string{
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"info": "This is the hello example server.",
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}
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func handleEmbeddedResource(_ context.Context, _ *mcp.ServerSession, params *mcp.ReadResourceParams) (*mcp.ReadResourceResult, error) {
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u, err := url.Parse(params.URI)
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if err != nil {
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return nil, err
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}
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if u.Scheme != "embedded" {
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return nil, fmt.Errorf("wrong scheme: %q", u.Scheme)
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}
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key := u.Opaque
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text, ok := embeddedResources[key]
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if !ok {
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return nil, fmt.Errorf("no embedded resource named %q", key)
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}
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return &mcp.ReadResourceResult{
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Contents: []*mcp.ResourceContents{
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{URI: params.URI, MIMEType: "text/plain", Text: text},
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},
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}, nil
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}
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