Add official MCP server

cmd/keepassgo-mcp-server/main.go

@@ -0,0 +1,65 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"os"
+	"runtime"
+	"strings"
+
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+
+	"git.julianfamily.org/keepassgo/internal/browserbridge"
+	"git.julianfamily.org/keepassgo/internal/grpcaddr"
+	"git.julianfamily.org/keepassgo/internal/mcpserver"
+)
+
+var version = "dev"
+
+func main() {
+	if err := run(context.Background(), os.Args[1:]); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func run(ctx context.Context, args []string) error {
+	fs := flag.NewFlagSet("keepassgo-mcp-server", flag.ContinueOnError)
+	grpcAddress := fs.String("grpc-addr", envOrDefault("KEEPASSGO_GRPC_ADDR", grpcaddr.Default(runtime.GOOS)), "KeePassGO gRPC address")
+	if err := fs.Parse(args); err != nil {
+		return err
+	}
+	token := mcpToken()
+	if token == "" {
+		return fmt.Errorf("KeePassGO MCP bearer token is required; set KEEPASSGO_MCP_TOKEN or KEEPASSGO_BEARER_TOKEN")
+	}
+	conn, client, callCtx, err := browserbridge.Dial(ctx, browserbridge.Connection{
+		GRPCAddress: strings.TrimSpace(*grpcAddress),
+		BearerToken: token,
+	})
+	if err != nil {
+		return err
+	}
+	defer func() { _ = conn.Close() }()
+
+	server := mcpserver.New(client, mcpserver.Config{
+		GRPCAddress: strings.TrimSpace(*grpcAddress),
+		Version:     version,
+	})
+	return server.Run(callCtx, &mcp.StdioTransport{})
+}
+
+func envOrDefault(name, fallback string) string {
+	if value := strings.TrimSpace(os.Getenv(name)); value != "" {
+		return value
+	}
+	return fallback
+}
+
+func mcpToken() string {
+	if token := strings.TrimSpace(os.Getenv("KEEPASSGO_MCP_TOKEN")); token != "" {
+		return token
+	}
+	return strings.TrimSpace(os.Getenv("KEEPASSGO_BEARER_TOKEN"))
+}