fix: send mcp initialized as notification

pkg/tools/mcp.go

@@ -804,8 +804,7 @@ func (c *mcpHTTPClient) initialize(ctx context.Context) error {
 	if _, ok := result["protocolVersion"]; !ok {
 		return fmt.Errorf("mcp server %q initialize missing protocolVersion", c.serverName)
 	}
-	_, _ = c.request(ctx, "notifications/initialized", map[string]interface{}{})
-	return nil
+	return c.notify(ctx, "notifications/initialized", map[string]interface{}{})
 }
 
 func (c *mcpHTTPClient) listAll(ctx context.Context, method, field string) (map[string]interface{}, error) {
@@ -873,6 +872,33 @@ func (c *mcpHTTPClient) request(ctx context.Context, method string, params map[s
 	return out, nil
 }
 
+func (c *mcpHTTPClient) notify(ctx context.Context, method string, params map[string]interface{}) error {
+	payload := map[string]interface{}{
+		"jsonrpc": "2.0",
+		"method":  method,
+		"params":  params,
+	}
+	body, err := json.Marshal(payload)
+	if err != nil {
+		return err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, c.baseURL, bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := c.client.Do(req)
+	if err != nil {
+		return fmt.Errorf("mcp %s %s failed: %w", c.serverName, method, err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		data, _ := io.ReadAll(io.LimitReader(resp.Body, 4096))
+		return fmt.Errorf("mcp %s %s failed: http %d %s", c.serverName, method, resp.StatusCode, strings.TrimSpace(string(data)))
+	}
+	return nil
+}
+
 func (c *mcpClient) Close() error {
 	if c == nil || c.cmd == nil {
 		return nil

pkg/tools/mcp_test.go

@@ -373,6 +373,7 @@ func TestMCPToolListTools(t *testing.T) {
 }
 
 func TestMCPToolHTTPTransport(t *testing.T) {
+	initializedNotified := false
 	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		defer r.Body.Close()
 		var req map[string]interface{}
@@ -393,11 +394,13 @@ func TestMCPToolHTTPTransport(t *testing.T) {
 				},
 			}
 		case "notifications/initialized":
-			resp = map[string]interface{}{
-				"jsonrpc": "2.0",
-				"id":      id,
-				"result":  map[string]interface{}{},
+			if _, hasID := req["id"]; hasID {
+				http.Error(w, "notification must not include id", http.StatusBadRequest)
+				return
 			}
+			initializedNotified = true
+			w.WriteHeader(http.StatusAccepted)
+			return
 		case "tools/list":
 			resp = map[string]interface{}{
 				"jsonrpc": "2.0",
@@ -455,6 +458,9 @@ func TestMCPToolHTTPTransport(t *testing.T) {
 	if !strings.Contains(out, `"name": "echo"`) {
 		t.Fatalf("expected http tool listing, got: %s", out)
 	}
+	if !initializedNotified {
+		t.Fatal("expected initialized notification to be sent")
+	}
 }
 
 func TestMCPToolSSETransport(t *testing.T) {