diff --git a/ui/desktop/frontend/src/components/agents/AgentFormDialog.tsx b/ui/desktop/frontend/src/components/agents/AgentFormDialog.tsx
index 223b4d8db..f4760c725 100644
--- a/ui/desktop/frontend/src/components/agents/AgentFormDialog.tsx
+++ b/ui/desktop/frontend/src/components/agents/AgentFormDialog.tsx
@@ -25,6 +25,7 @@ export function AgentFormDialog({ open, onOpenChange, agent, onSubmit }: AgentFo
   const { register, handleSubmit, watch, setValue, reset, formState: { errors, isSubmitting } } = useForm<AgentFormData>({
     resolver: zodResolver(agentFormSchema),
     mode: 'onChange',
+    defaultValues: { displayName: '', emoji: '🦊', agentKey: '', providerName: '', model: '', description: '', isDefault: false },
   })
 
   // UI-only state (not form data)
diff --git a/ui/desktop/frontend/src/components/channels/ChannelFormDialog.tsx b/ui/desktop/frontend/src/components/channels/ChannelFormDialog.tsx
index 03c65e1f8..26da967e8 100644
--- a/ui/desktop/frontend/src/components/channels/ChannelFormDialog.tsx
+++ b/ui/desktop/frontend/src/components/channels/ChannelFormDialog.tsx
@@ -25,6 +25,7 @@ export function ChannelFormDialog({ open, onOpenChange, agents, telegramExists,
   const { handleSubmit, watch, setValue, reset, formState: { errors, isSubmitting } } = useForm<ChannelFormData>({
     resolver: zodResolver(channelFormSchema),
     mode: 'onChange',
+    defaultValues: { displayName: '', channelType: '', agentId: '', enabled: true, credentials: {} },
   })
 
   const channelType = watch('channelType')
diff --git a/ui/desktop/frontend/src/components/mcp/McpFormDialog.tsx b/ui/desktop/frontend/src/components/mcp/McpFormDialog.tsx
index eb3b52533..3f35ea73f 100644
--- a/ui/desktop/frontend/src/components/mcp/McpFormDialog.tsx
+++ b/ui/desktop/frontend/src/components/mcp/McpFormDialog.tsx
@@ -26,6 +26,7 @@ export function McpFormDialog({ open, onOpenChange, server, onSubmit, onTest }:
   const { register, handleSubmit, watch, setValue, reset, formState: { errors, isSubmitting } } = useForm<MCPFormData>({
     resolver: zodResolver(mcpFormSchema),
     mode: 'onChange',
+    defaultValues: { name: '', displayName: '', transport: 'stdio', command: '', args: '', url: '', headers: {}, env: {}, toolPrefix: '', timeoutSec: 30, enabled: true },
   })
 
   // Test connection state (UI-only, not form data)
diff --git a/ui/desktop/frontend/src/components/providers/ProviderFormDialog.tsx b/ui/desktop/frontend/src/components/providers/ProviderFormDialog.tsx
index 04b389fd7..f8043b630 100644
--- a/ui/desktop/frontend/src/components/providers/ProviderFormDialog.tsx
+++ b/ui/desktop/frontend/src/components/providers/ProviderFormDialog.tsx
@@ -23,6 +23,7 @@ export function ProviderFormDialog({ open, onOpenChange, provider, onSubmit }: P
   const { register, handleSubmit, watch, setValue, reset, formState: { errors, isSubmitting } } = useForm<ProviderFormData>({
     resolver: zodResolver(providerFormSchema),
     mode: 'onChange',
+    defaultValues: { providerType: '', displayName: '', apiBase: '', apiKey: '', enabled: true },
   })
 
   // Reset form when dialog opens
diff --git a/ui/desktop/frontend/src/components/teams/TeamSettingsModal.tsx b/ui/desktop/frontend/src/components/teams/TeamSettingsModal.tsx
index 048f14ca1..6d3bd0e4d 100644
--- a/ui/desktop/frontend/src/components/teams/TeamSettingsModal.tsx
+++ b/ui/desktop/frontend/src/components/teams/TeamSettingsModal.tsx
@@ -35,6 +35,7 @@ export function TeamSettingsModal({ teamId, onClose, onSaved }: TeamSettingsModa
   const { watch, setValue, reset, handleSubmit, formState: { isSubmitting } } = useForm<TeamSettingsFormData>({
     resolver: zodResolver(teamSettingsSchema),
     mode: 'onChange',
+    defaultValues: { name: '', description: '', notify: { dispatched: true, progress: true, failed: true, completed: true, new_task: true }, notifyMode: 'direct' },
   })
 
   useEffect(() => {