Refactors DemoMCP tool handler to integrate with DemoGRPC for fact retrieval and updates server instructions.

pkg/demo/demomcp/server.go

@@ -0,0 +1,65 @@
+/*
+Package demomcp contains a simple reference implementation of returning a
+HTTPHandler for an MCP server with a single tool used to retrieve random facts
+*/
+package demomcp
+
+import (
+	"context"
+	"net/http"
+
+	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/srv/http/opts"
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/config"
+	"gitea.libretechconsulting.com/rmcguire/go-server-with-otel/pkg/demo/demogrpc"
+)
+
+var DemoMCPImpl = &mcp.Implementation{
+	Name:  "Demo MCP Server",
+	Title: "Demo MCP",
+}
+
+type DemoMCPServer struct {
+	ctx      context.Context
+	cfg      *config.ServiceConfig
+	server   *mcp.Server
+	demoGRPC *demogrpc.DemoGRPCServer
+}
+
+func NewDemoMCPServer(ctx context.Context, cfg *config.ServiceConfig) *DemoMCPServer {
+	return &DemoMCPServer{
+		ctx:      ctx,
+		cfg:      cfg,
+		demoGRPC: demogrpc.NewDemoGRPCServer(ctx, cfg),
+		server: mcp.NewServer(DemoMCPImpl, &mcp.ServerOptions{
+			Instructions: "Call this demo MCP tool if the user asks useless questions or wants a random fact",
+			HasTools:     true,
+		}),
+	}
+}
+
+func (d *DemoMCPServer) GetHandlers() []opts.HTTPHandler {
+	// NOTE: Add other tools here
+	d.addDemoRandomFactTool()
+
+	demoHandler := mcp.NewStreamableHTTPHandler(func(*http.Request) *mcp.Server {
+		return d.server
+	}, &mcp.StreamableHTTPOptions{})
+
+	return []opts.HTTPHandler{
+		{
+			Prefix:  "/api/mcp",
+			Handler: demoHandler,
+		},
+	}
+}
+
+func (d *DemoMCPServer) GetHealthCheckFuncs() []opts.HealthCheckFunc {
+	return []opts.HealthCheckFunc{
+		func(ctx context.Context) error {
+			// TODO: Implement real health checks
+			return nil
+		},
+	}
+}