feat: support manual entry of OAuth client information

client/src/App.tsx

@@ -119,6 +119,14 @@ const App = () => {
     return localStorage.getItem("lastHeaderName") || "";
   });
 
+  const [oauthClientId, setOauthClientId] = useState<string>(() => {
+    return localStorage.getItem("lastOauthClientId") || "";
+  });
+
+  const [oauthScope, setOauthScope] = useState<string>(() => {
+    return localStorage.getItem("lastOauthScope") || "";
+  });
+
   const [pendingSampleRequests, setPendingSampleRequests] = useState<
     Array<
       PendingRequest & {
@@ -187,6 +195,8 @@ const App = () => {
     env,
     bearerToken,
     headerName,
+    oauthClientId,
+    oauthScope,
     config,
     onNotification: (notification) => {
       setNotifications((prev) => [...prev, notification as ServerNotification]);
@@ -230,6 +240,14 @@ const App = () => {
     localStorage.setItem("lastHeaderName", headerName);
   }, [headerName]);
 
+  useEffect(() => {
+    localStorage.setItem("lastOauthClientId", oauthClientId);
+  }, [oauthClientId]);
+
+  useEffect(() => {
+    localStorage.setItem("lastOauthScope", oauthScope);
+  }, [oauthScope]);
+
   useEffect(() => {
     saveInspectorConfig(CONFIG_LOCAL_STORAGE_KEY, config);
   }, [config]);
@@ -658,6 +676,10 @@ const App = () => {
           setBearerToken={setBearerToken}
           headerName={headerName}
           setHeaderName={setHeaderName}
+          oauthClientId={oauthClientId}
+          setOauthClientId={setOauthClientId}
+          oauthScope={oauthScope}
+          setOauthScope={setOauthScope}
           onConnect={connectMcpServer}
           onDisconnect={disconnectMcpServer}
           stdErrNotifications={stdErrNotifications}

client/src/components/Sidebar.tsx

@@ -56,6 +56,10 @@ interface SidebarProps {
   setBearerToken: (token: string) => void;
   headerName?: string;
   setHeaderName?: (name: string) => void;
+  oauthClientId: string;
+  setOauthClientId: (id: string) => void;
+  oauthScope: string;
+  setOauthScope: (scope: string) => void;
   onConnect: () => void;
   onDisconnect: () => void;
   stdErrNotifications: StdErrNotification[];
@@ -83,6 +87,10 @@ const Sidebar = ({
   setBearerToken,
   headerName,
   setHeaderName,
+  oauthClientId,
+  setOauthClientId,
+  oauthScope,
+  setOauthScope,
   onConnect,
   onDisconnect,
   stdErrNotifications,
@@ -95,7 +103,7 @@ const Sidebar = ({
 }: SidebarProps) => {
   const [theme, setTheme] = useTheme();
   const [showEnvVars, setShowEnvVars] = useState(false);
-  const [showBearerToken, setShowBearerToken] = useState(false);
+  const [showAuthConfig, setShowAuthConfig] = useState(false);
   const [showConfig, setShowConfig] = useState(false);
   const [shownEnvVars, setShownEnvVars] = useState<Set<string>>(new Set());
   const [copiedServerEntry, setCopiedServerEntry] = useState(false);
@@ -308,51 +316,6 @@ const Sidebar = ({
                   />
                 )}
               </div>
-              <div className="space-y-2">
-                <Button
-                  variant="outline"
-                  onClick={() => setShowBearerToken(!showBearerToken)}
-                  className="flex items-center w-full"
-                  data-testid="auth-button"
-                  aria-expanded={showBearerToken}
-                >
-                  {showBearerToken ? (
-                    <ChevronDown className="w-4 h-4 mr-2" />
-                  ) : (
-                    <ChevronRight className="w-4 h-4 mr-2" />
-                  )}
-                  Authentication
-                </Button>
-                {showBearerToken && (
-                  <div className="space-y-2">
-                    <label className="text-sm font-medium">Header Name</label>
-                    <Input
-                      placeholder="Authorization"
-                      onChange={(e) =>
-                        setHeaderName && setHeaderName(e.target.value)
-                      }
-                      data-testid="header-input"
-                      className="font-mono"
-                      value={headerName}
-                    />
-                    <label
-                      className="text-sm font-medium"
-                      htmlFor="bearer-token-input"
-                    >
-                      Bearer Token
-                    </label>
-                    <Input
-                      id="bearer-token-input"
-                      placeholder="Bearer Token"
-                      value={bearerToken}
-                      onChange={(e) => setBearerToken(e.target.value)}
-                      data-testid="bearer-token-input"
-                      className="font-mono"
-                      type="password"
-                    />
-                  </div>
-                )}
-              </div>
             </>
           )}
 
@@ -521,6 +484,94 @@ const Sidebar = ({
             </Tooltip>
           </div>
 
+          <div className="space-y-2">
+            <Button
+              variant="outline"
+              onClick={() => setShowAuthConfig(!showAuthConfig)}
+              className="flex items-center w-full"
+              data-testid="auth-button"
+              aria-expanded={showAuthConfig}
+            >
+              {showAuthConfig ? (
+                <ChevronDown className="w-4 h-4 mr-2" />
+              ) : (
+                <ChevronRight className="w-4 h-4 mr-2" />
+              )}
+              Authentication
+            </Button>
+            {showAuthConfig && (
+              <>
+                {/* Bearer Token Section */}
+                <div className="space-y-2 p-3 rounded border">
+                  <h4 className="text-sm font-semibold flex items-center">
+                    API Token Authentication
+                  </h4>
+                  <div className="space-y-2">
+                    <label className="text-sm font-medium">Header Name</label>
+                    <Input
+                      placeholder="Authorization"
+                      onChange={(e) =>
+                        setHeaderName && setHeaderName(e.target.value)
+                      }
+                      data-testid="header-input"
+                      className="font-mono"
+                      value={headerName}
+                    />
+                    <label
+                      className="text-sm font-medium"
+                      htmlFor="bearer-token-input"
+                    >
+                      Bearer Token
+                    </label>
+                    <Input
+                      id="bearer-token-input"
+                      placeholder="Bearer Token"
+                      value={bearerToken}
+                      onChange={(e) => setBearerToken(e.target.value)}
+                      data-testid="bearer-token-input"
+                      className="font-mono"
+                      type="password"
+                    />
+                  </div>
+                </div>
+                {transportType !== "stdio" && (
+                  // OAuth Configuration
+                  <div className="space-y-2 p-3  rounded border">
+                    <h4 className="text-sm font-semibold flex items-center">
+                      OAuth 2.0 Flow
+                    </h4>
+                    <div className="space-y-2">
+                      <label className="text-sm font-medium">Client ID</label>
+                      <Input
+                        placeholder="Client ID"
+                        onChange={(e) => setOauthClientId(e.target.value)}
+                        value={oauthClientId}
+                        data-testid="oauth-client-id-input"
+                        className="font-mono"
+                      />
+                      <label className="text-sm font-medium">
+                        Redirect URL
+                      </label>
+                      <Input
+                        readOnly
+                        placeholder="Redirect URL"
+                        value={window.location.origin + "/oauth/callback"}
+                        className="font-mono"
+                      />
+                      <label className="text-sm font-medium">Scope</label>
+                      <Input
+                        placeholder="Scope (space-separated)"
+                        onChange={(e) => setOauthScope(e.target.value)}
+                        value={oauthScope}
+                        data-testid="oauth-scope-input"
+                        className="font-mono"
+                      />
+                    </div>
+                  </div>
+                )}
+              </>
+            )}
+          </div>
           {/* Configuration */}
           <div className="space-y-2">
             <Button

client/src/components/__tests__/Sidebar.test.tsx

@@ -42,6 +42,10 @@ describe("Sidebar Environment Variables", () => {
     setArgs: jest.fn(),
     sseUrl: "",
     setSseUrl: jest.fn(),
+    oauthClientId: "",
+    setOauthClientId: jest.fn(),
+    oauthScope: "",
+    setOauthScope: jest.fn(),
     env: {},
     setEnv: jest.fn(),
     bearerToken: "",

client/src/lib/auth.ts

@@ -9,8 +9,64 @@ import {
 } from "@modelcontextprotocol/sdk/shared/auth.js";
 import { SESSION_KEYS, getServerSpecificKey } from "./constants";
 
+export const getClientInformationFromSessionStorage = async ({
+  serverUrl,
+  isPreregistered,
+}: {
+  serverUrl: string;
+  isPreregistered?: boolean;
+}) => {
+  const key = getServerSpecificKey(
+    isPreregistered
+      ? SESSION_KEYS.PREREGISTERED_CLIENT_INFORMATION
+      : SESSION_KEYS.CLIENT_INFORMATION,
+    serverUrl,
+  );
+
+  const value = sessionStorage.getItem(key);
+  if (!value) {
+    return undefined;
+  }
+
+  return await OAuthClientInformationSchema.parseAsync(JSON.parse(value));
+};
+
+export const saveClientInformationToSessionStorage = ({
+  serverUrl,
+  clientInformation,
+  isPreregistered,
+}: {
+  serverUrl: string;
+  clientInformation: OAuthClientInformation;
+  isPreregistered?: boolean;
+}) => {
+  const key = getServerSpecificKey(
+    isPreregistered
+      ? SESSION_KEYS.PREREGISTERED_CLIENT_INFORMATION
+      : SESSION_KEYS.CLIENT_INFORMATION,
+    serverUrl,
+  );
+  sessionStorage.setItem(key, JSON.stringify(clientInformation));
+};
+
+export const clearClientInformationFromSessionStorage = ({
+  serverUrl,
+  isPreregistered,
+}: {
+  serverUrl: string;
+  isPreregistered?: boolean;
+}) => {
+  const key = getServerSpecificKey(
+    isPreregistered
+      ? SESSION_KEYS.PREREGISTERED_CLIENT_INFORMATION
+      : SESSION_KEYS.CLIENT_INFORMATION,
+    serverUrl,
+  );
+  sessionStorage.removeItem(key);
+};
+
 export class InspectorOAuthClientProvider implements OAuthClientProvider {
-  constructor(public serverUrl: string) {
+  constructor(protected serverUrl: string) {
     // Save the server URL to session storage
     sessionStorage.setItem(SESSION_KEYS.SERVER_URL, serverUrl);
   }
@@ -31,24 +87,30 @@ export class InspectorOAuthClientProvider implements OAuthClientProvider {
   }
 
   async clientInformation() {
-    const key = getServerSpecificKey(
-      SESSION_KEYS.CLIENT_INFORMATION,
-      this.serverUrl,
+    // Try to get the preregistered client information from session storage first
+    const preregisteredClientInformation =
+      await getClientInformationFromSessionStorage({
+        serverUrl: this.serverUrl,
+        isPreregistered: true,
+      });
+
+    // If no preregistered client information is found, get the dynamically registered client information
+    return (
+      preregisteredClientInformation ??
+      (await getClientInformationFromSessionStorage({
+        serverUrl: this.serverUrl,
+        isPreregistered: false,
+      }))
     );
-    const value = sessionStorage.getItem(key);
-    if (!value) {
-      return undefined;
-    }
-
-    return await OAuthClientInformationSchema.parseAsync(JSON.parse(value));
   }
 
   saveClientInformation(clientInformation: OAuthClientInformation) {
-    const key = getServerSpecificKey(
-      SESSION_KEYS.CLIENT_INFORMATION,
-      this.serverUrl,
-    );
-    sessionStorage.setItem(key, JSON.stringify(clientInformation));
+    // Save the dynamically registered client information to session storage
+    saveClientInformationToSessionStorage({
+      serverUrl: this.serverUrl,
+      clientInformation,
+      isPreregistered: false,
+    });
   }
 
   async tokens() {
@@ -92,9 +154,10 @@ export class InspectorOAuthClientProvider implements OAuthClientProvider {
   }
 
   clear() {
-    sessionStorage.removeItem(
-      getServerSpecificKey(SESSION_KEYS.CLIENT_INFORMATION, this.serverUrl),
-    );
+    clearClientInformationFromSessionStorage({
+      serverUrl: this.serverUrl,
+      isPreregistered: false,
+    });
     sessionStorage.removeItem(
       getServerSpecificKey(SESSION_KEYS.TOKENS, this.serverUrl),
     );

client/src/lib/constants.ts

@@ -6,6 +6,7 @@ export const SESSION_KEYS = {
   SERVER_URL: "mcp_server_url",
   TOKENS: "mcp_tokens",
   CLIENT_INFORMATION: "mcp_client_information",
+  PREREGISTERED_CLIENT_INFORMATION: "mcp_preregistered_client_information",
   SERVER_METADATA: "mcp_server_metadata",
   AUTH_DEBUGGER_STATE: "mcp_auth_debugger_state",
 } as const;

client/src/lib/hooks/__tests__/useConnection.test.tsx

@@ -82,6 +82,8 @@ jest.mock("../../auth", () => ({
   InspectorOAuthClientProvider: jest.fn().mockImplementation(() => ({
     tokens: jest.fn().mockResolvedValue({ access_token: "mock-token" }),
   })),
+  clearClientInformationFromSessionStorage: jest.fn(),
+  saveClientInformationToSessionStorage: jest.fn(),
 }));
 
 describe("useConnection", () => {