fix(mcp): return authType from create-server endpoint

The POST /api/mcp/servers handler omitted authType from the success
response, so useCreateMcpServer always saw data.data.authType as
undefined and never triggered the OAuth popup after creating an
OAuth-protected server. Thread authType through performCreateMcpServer
into the response so the client can decide whether to auto-start OAuth.

Author: waleedlatif1

apps/sim/app/api/mcp/servers/route.ts

@@ -115,8 +115,8 @@ export const POST = withRouteHandler(
 
         return createMcpSuccessResponse(
           result.updated
-            ? { serverId: result.serverId, updated: true }
-            : { serverId: result.serverId },
+            ? { serverId: result.serverId, updated: true, authType: result.authType }
+            : { serverId: result.serverId, authType: result.authType },
           result.updated ? 200 : 201
         )
       } catch (error) {

apps/sim/lib/mcp/orchestration/server-lifecycle.ts

@@ -83,6 +83,7 @@ export interface PerformMcpServerResult {
   serverId?: string
   server?: typeof mcpServers.$inferSelect
   updated?: boolean
+  authType?: McpAuthType
 }
 
 async function validateMcpServerUrl(url: string): Promise<PerformMcpServerResult | null> {
@@ -198,7 +199,7 @@ export async function performCreateMcpServer(
       })
 
       await mcpService.clearCache(params.workspaceId)
-      return { success: true, serverId, updated: true }
+      return { success: true, serverId, updated: true, authType: resolvedAuthType }
     }
 
     await db.insert(mcpServers).values({
@@ -268,7 +269,7 @@ export async function performCreateMcpServer(
       request: params.request,
     })
 
-    return { success: true, serverId, updated: false }
+    return { success: true, serverId, updated: false, authType: resolvedAuthType }
   } catch (error) {
     logger.error('Failed to create MCP server', { error })
     return { success: false, error: 'Failed to register MCP server', errorCode: 'internal' }