test(mcpconns): cover Streamable HTTP and legacy SSE connectors

Connecting a connector must reach both MCP transports. Adds specs that resolve a
Streamable HTTP server promptly and a legacy SSE server, through the same
mcptransport.Connect path that agent runs use.

Signed-off-by: rossg <ross@golder.org>
(cherry picked from commit 4feaf9db39)
(cherry picked from commit fab3cfa21c13747e03115d7cc39f2466962f16e8)

core/services/studio/mcpconns/transport_test.go

@@ -0,0 +1,65 @@
+package mcpconns_test
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"time"
+
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+
+	"github.com/mudler/LocalAI/core/services/studio/mcpconns"
+)
+
+// Regression: agent MCP servers that speak Streamable HTTP were never connected. The
+// agent path only tried the legacy SSE transport, so the connection waited for an SSE
+// handshake that never came and the agent stalled before its first model call. Connecting
+// a connector must reach both transports.
+var _ = Describe("MCP connector transports", func() {
+	transportServer := func(serve func(get func(*http.Request) *mcp.Server) http.Handler) *httptest.Server {
+		srv := mcp.NewServer(&mcp.Implementation{Name: "transport-fixture", Version: "v0.0.1"}, nil)
+		mcp.AddTool(srv, &mcp.Tool{Name: "ping", Description: "fixture tool"},
+			func(_ context.Context, _ *mcp.CallToolRequest, _ echoIn) (*mcp.CallToolResult, any, error) {
+				return &mcp.CallToolResult{Content: []mcp.Content{&mcp.TextContent{Text: "pong"}}}, nil, nil
+			})
+		ts := httptest.NewServer(serve(func(*http.Request) *mcp.Server { return srv }))
+		DeferCleanup(func() { ts.CloseClientConnections(); ts.Close() })
+		return ts
+	}
+
+	resolvedNames := func(e *env, ts *httptest.Server) []string {
+		c, err := e.svc.Create(specCtx(), "u1", httpInput("Transport", ts.URL))
+		Expect(err).NotTo(HaveOccurred())
+		tools, missing := e.svc.Resolve(specCtx(), "u1", []string{c.ID}, false)
+		Expect(missing).To(BeEmpty(), "connector did not connect")
+		names := make([]string, 0, len(tools))
+		for _, t := range tools {
+			names = append(names, t.Name)
+		}
+		return names
+	}
+
+	It("connects to a Streamable HTTP MCP server promptly", func() {
+		ts := transportServer(func(get func(*http.Request) *mcp.Server) http.Handler {
+			return mcp.NewStreamableHTTPHandler(get, nil)
+		})
+		e := newEnv(func(o *mcpconns.Options) { o.ConnectTimeout = 20 * time.Second })
+
+		start := time.Now()
+		names := resolvedNames(e, ts)
+		Expect(time.Since(start)).To(BeNumerically("<", 10*time.Second), "connect waited for the SSE handshake")
+		Expect(names).To(ContainElement("ping"))
+	})
+
+	It("still connects to a legacy SSE MCP server", func() {
+		ts := transportServer(func(get func(*http.Request) *mcp.Server) http.Handler {
+			return mcp.NewSSEHandler(get, nil)
+		})
+		e := newEnv(func(o *mcpconns.Options) { o.ConnectTimeout = 20 * time.Second })
+
+		Expect(resolvedNames(e, ts)).To(ContainElement("ping"))
+	})
+})