Sign in to MCP presets from the connect wizard

Notion, Linear, Atlassian, Sentry, Asana and Stripe no longer open the
MCP server form. The wizard shows one "Sign in to Notion" button: the
pop-up opens inside the click (so browsers allow it), follows the
worker's mcp.oauth events to the provider, and the tool is saved on
success with its actions on the done step. Reconnecting a preset uses
the same flow, as do the chat bar and the health toast.

Saving an OAuth MCP server without a new handshake now uses the stored
sign-in instead of failing, and the custom MCP form keeps scopes and
timeout under Show advanced.

docsgpt/api/user/tools/mcp.py

@@ -310,8 +310,14 @@ class MCPServerSave(Resource):
             mcp_config = config.copy()
             mcp_config["auth_credentials"] = auth_credentials
 
-            if auth_type == "oauth":
-                if not config.get("oauth_task_id"):
+            if auth_type == "oauth" and not config.get("oauth_task_id"):
+                # No new handshake: the caller signed in to this server
+                # before, so its stored tokens answer the discovery.
+                try:
+                    mcp_tool = MCPTool(config=mcp_config, user_id=user)
+                    mcp_tool.discover_tools()
+                    actions_metadata = mcp_tool.get_actions_metadata()
+                except Exception:
                     return make_response(
                         jsonify(
                             {
@@ -321,6 +327,7 @@ class MCPServerSave(Resource):
                         ),
                         400,
                     )
+            elif auth_type == "oauth":
                 redis_client = get_redis_instance()
                 manager = MCPOAuthManager(redis_client)
                 result = manager.get_oauth_status(