diff --git a/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/bulk_import/sections/source.tsx b/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/bulk_import/sections/source.tsx
index ed7880c0a2588..459dfd9791c86 100644
--- a/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/bulk_import/sections/source.tsx
+++ b/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/bulk_import/sections/source.tsx
@@ -26,7 +26,8 @@ const mcpActionLinkStyles = (euiThemeContext: UseEuiTheme) => css`
 
 export const SourceSection = () => {
   const euiThemeContext = useEuiTheme();
-  const { control, formState, setValue } = useFormContext<BulkImportMcpToolsFormData>();
+  const { control, formState, setValue, trigger, getFieldState } =
+    useFormContext<BulkImportMcpToolsFormData>();
   const { errors } = formState;
 
   const handleConnectorCreated = useCallback(
@@ -100,6 +101,9 @@ export const SourceSection = () => {
                   onBlur();
                   // Clear tool selection when connector changes
                   setValue('tools', []);
+                  if (getFieldState('namespace').isDirty) {
+                    trigger('namespace');
+                  }
                 }}
                 isLoading={isLoadingConnectors}
                 inputRef={ref}
diff --git a/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/form/validation/bulk_import_mcp_tool_form_validation.ts b/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/form/validation/bulk_import_mcp_tool_form_validation.ts
index efec367a3ddfa..542fcdc8fa58a 100644
--- a/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/form/validation/bulk_import_mcp_tool_form_validation.ts
+++ b/x-pack/platform/plugins/shared/agent_builder/public/application/components/tools/form/validation/bulk_import_mcp_tool_form_validation.ts
@@ -75,44 +75,50 @@ export const useBulkImportMcpToolFormValidationSchema = () => {
   const { toolsService } = useAgentBuilderServices();
   const queryClient = useQueryClient();
 
-  return z.object({
-    connectorId: z
-      .string()
-      .min(1, { message: bulkImportMcpI18nMessages.connectorId.requiredError }),
-    tools: z
-      .array(
-        z.object({
-          name: z.string(),
-          description: z.string(),
-        })
-      )
-      .min(1, { message: bulkImportMcpI18nMessages.tools.requiredError }),
-    namespace: z
-      .string()
-      .min(1, { message: bulkImportMcpI18nMessages.namespace.requiredError })
-      .max(toolIdMaxLength, { message: bulkImportMcpI18nMessages.namespace.tooLongError })
-      .regex(toolIdRegexp, { message: bulkImportMcpI18nMessages.namespace.formatError })
-      .refine(
-        (name) => !isInProtectedNamespace(name) && !hasNamespaceName(name),
-        (name) => ({
-          message: bulkImportMcpI18nMessages.namespace.protectedNamespaceError(name),
-        })
-      )
-      .superRefine(async (value, ctx) => {
-        if (value.length > 0) {
-          const { isValid } = await queryClient.fetchQuery({
-            queryKey: queryKeys.tools.namespace.validate(value),
-            queryFn: () => toolsService.validateNamespace({ namespace: value }),
-            staleTime: 0,
+  return z
+    .object({
+      connectorId: z
+        .string()
+        .min(1, { message: bulkImportMcpI18nMessages.connectorId.requiredError }),
+      tools: z
+        .array(
+          z.object({
+            name: z.string(),
+            description: z.string(),
+          })
+        )
+        .min(1, { message: bulkImportMcpI18nMessages.tools.requiredError }),
+      namespace: z
+        .string()
+        .min(1, { message: bulkImportMcpI18nMessages.namespace.requiredError })
+        .max(toolIdMaxLength, { message: bulkImportMcpI18nMessages.namespace.tooLongError })
+        .regex(toolIdRegexp, { message: bulkImportMcpI18nMessages.namespace.formatError })
+        .refine(
+          (name) => !isInProtectedNamespace(name) && !hasNamespaceName(name),
+          (name) => ({
+            message: bulkImportMcpI18nMessages.namespace.protectedNamespaceError(name),
+          })
+        ),
+      labels: z.array(z.string()),
+    })
+    .superRefine(async (data, ctx) => {
+      if (data.namespace.length > 0 && data.connectorId.length > 0) {
+        const { isValid } = await queryClient.fetchQuery({
+          queryKey: queryKeys.tools.namespace.validate(data.namespace, data.connectorId),
+          queryFn: () =>
+            toolsService.validateNamespace({
+              namespace: data.namespace,
+              connectorId: data.connectorId,
+            }),
+          staleTime: 0,
+        });
+        if (!isValid) {
+          ctx.addIssue({
+            code: z.ZodIssueCode.custom,
+            message: bulkImportMcpI18nMessages.namespace.conflictError,
+            path: ['namespace'],
           });
-          if (!isValid) {
-            ctx.addIssue({
-              code: z.ZodIssueCode.custom,
-              message: bulkImportMcpI18nMessages.namespace.conflictError,
-            });
-          }
         }
-      }),
-    labels: z.array(z.string()),
-  });
+      }
+    });
 };
diff --git a/x-pack/platform/plugins/shared/agent_builder/public/application/hooks/tools/use_validate_namespace.ts b/x-pack/platform/plugins/shared/agent_builder/public/application/hooks/tools/use_validate_namespace.ts
index 6d29d84714e1d..ddc2b4bfb0a79 100644
--- a/x-pack/platform/plugins/shared/agent_builder/public/application/hooks/tools/use_validate_namespace.ts
+++ b/x-pack/platform/plugins/shared/agent_builder/public/application/hooks/tools/use_validate_namespace.ts
@@ -11,17 +11,22 @@ import { useAgentBuilderServices } from '../use_agent_builder_service';
 
 export interface UseValidateNamespaceOptions {
   namespace: string;
+  connectorId?: string;
   enabled?: boolean;
 }
 
-export const useValidateNamespace = ({ namespace, enabled }: UseValidateNamespaceOptions) => {
+export const useValidateNamespace = ({
+  namespace,
+  connectorId,
+  enabled,
+}: UseValidateNamespaceOptions) => {
   const { toolsService } = useAgentBuilderServices();
 
   const isEnabled = enabled ?? namespace.length > 0;
 
   const { data, isLoading, error, isError, isFetching } = useQuery({
-    queryKey: queryKeys.tools.namespace.validate(namespace),
-    queryFn: () => toolsService.validateNamespace({ namespace }),
+    queryKey: queryKeys.tools.namespace.validate(namespace, connectorId),
+    queryFn: () => toolsService.validateNamespace({ namespace, connectorId }),
     enabled: isEnabled,
     staleTime: 0,
   });
diff --git a/x-pack/platform/plugins/shared/agent_builder/public/application/query_keys.ts b/x-pack/platform/plugins/shared/agent_builder/public/application/query_keys.ts
index e027cba5dc852..334fab82b6c00 100644
--- a/x-pack/platform/plugins/shared/agent_builder/public/application/query_keys.ts
+++ b/x-pack/platform/plugins/shared/agent_builder/public/application/query_keys.ts
@@ -40,7 +40,8 @@ export const queryKeys = {
       mcp: () => ['tools', 'health', 'mcp'] as const,
     },
     namespace: {
-      validate: (namespace: string) => ['tools', 'namespace', 'validate', namespace] as const,
+      validate: (namespace: string, connectorId?: string) =>
+        ['tools', 'namespace', 'validate', namespace, connectorId] as const,
     },
   },
 };
diff --git a/x-pack/platform/plugins/shared/agent_builder/public/services/tools/tools_service.ts b/x-pack/platform/plugins/shared/agent_builder/public/services/tools/tools_service.ts
index e01a8283b4ff9..dbab9ed9193eb 100644
--- a/x-pack/platform/plugins/shared/agent_builder/public/services/tools/tools_service.ts
+++ b/x-pack/platform/plugins/shared/agent_builder/public/services/tools/tools_service.ts
@@ -168,10 +168,10 @@ export class ToolsService {
     );
   }
 
-  async validateNamespace({ namespace }: { namespace: string }) {
+  async validateNamespace({ namespace, connectorId }: { namespace: string; connectorId?: string }) {
     return await this.http.get<ValidateNamespaceResponse>(
       `${internalApiPath}/tools/_validate_namespace`,
-      { query: { namespace } }
+      { query: { namespace, connector_id: connectorId } }
     );
   }
 }
diff --git a/x-pack/platform/plugins/shared/agent_builder/server/routes/internal/tools.ts b/x-pack/platform/plugins/shared/agent_builder/server/routes/internal/tools.ts
index a45dbda2634a7..0772da8c946f2 100644
--- a/x-pack/platform/plugins/shared/agent_builder/server/routes/internal/tools.ts
+++ b/x-pack/platform/plugins/shared/agent_builder/server/routes/internal/tools.ts
@@ -238,6 +238,7 @@ export function registerInternalToolsRoutes({
       validate: {
         query: schema.object({
           namespace: schema.string(),
+          connector_id: schema.maybe(schema.string()),
         }),
       },
       options: { access: 'internal' },
@@ -246,33 +247,54 @@ export function registerInternalToolsRoutes({
       },
     },
     wrapHandler(async (ctx, request, response) => {
-      const { namespace } = request.query;
+      const { namespace, connector_id: connectorId } = request.query;
       const { tools: toolService } = getInternalServices();
       const registry = await toolService.getRegistry({ request });
 
       const allTools = await registry.list({});
 
-      // Extract namespaces from tool IDs
-      // A tool ID like "mcp.github.tool_name" has namespace "mcp.github"
-      // A tool ID like "mcp.tool_name" has namespace "mcp"
-      // A tool ID like "tool_name" has no namespace
-      const existingNamespaces = new Set<string>();
-      allTools.forEach((tool) => {
+      const toolsInNamespace = allTools.filter((tool) => {
         const lastDotIndex = tool.id.lastIndexOf('.');
         if (lastDotIndex > 0) {
           const toolNamespace = tool.id.substring(0, lastDotIndex);
-          existingNamespaces.add(toolNamespace);
+          return toolNamespace === namespace;
         }
+        return false;
       });
 
-      const conflictingNamespaces = Array.from(existingNamespaces).filter(
-        (existingNamespace) => existingNamespace === namespace
-      );
+      if (toolsInNamespace.length === 0) {
+        return response.ok<ValidateNamespaceResponse>({
+          body: {
+            isValid: true,
+            conflictingNamespaces: [],
+          },
+        });
+      }
+
+      // If connectorId is provided, check if all tools in the namespace belong to the same connector
+      // This allows reusing a namespace for the same MCP server
+      if (connectorId) {
+        const allToolsBelongToSameConnector = toolsInNamespace.every((tool) => {
+          if (isMcpTool(tool)) {
+            return tool.configuration.connector_id === connectorId;
+          }
+          return false;
+        });
+
+        if (allToolsBelongToSameConnector) {
+          return response.ok<ValidateNamespaceResponse>({
+            body: {
+              isValid: true,
+              conflictingNamespaces: [],
+            },
+          });
+        }
+      }
 
       return response.ok<ValidateNamespaceResponse>({
         body: {
-          isValid: conflictingNamespaces.length === 0,
-          conflictingNamespaces,
+          isValid: false,
+          conflictingNamespaces: [namespace],
         },
       });
     })