diff --git a/rsconcept/frontend/src/components/info/TooltipOperation.tsx b/rsconcept/frontend/src/components/info/TooltipOperation.tsx
new file mode 100644
index 00000000..59ebfdab
--- /dev/null
+++ b/rsconcept/frontend/src/components/info/TooltipOperation.tsx
@@ -0,0 +1,33 @@
+import Tooltip from '@/components/ui/Tooltip';
+import { IOperation } from '@/models/oss';
+import { labelOperationType } from '@/utils/labels';
+
+interface TooltipOperationProps {
+  data: IOperation;
+  anchor: string;
+}
+
+function TooltipOperation({ data, anchor }: TooltipOperationProps) {
+  return (
+    <Tooltip layer='z-modalTooltip' anchorSelect={anchor} className='max-w-[30rem] dense'>
+      <h2>Операция {data.alias}</h2>
+      <p>
+        <b>Тип:</b> {labelOperationType(data.operation_type)}
+      </p>
+      {data.title ? (
+        <p>
+          <b>Название: </b>
+          {data.title}
+        </p>
+      ) : null}
+      {data.comment ? (
+        <p>
+          <b>Комментарий: </b>
+          {data.comment}
+        </p>
+      ) : null}
+    </Tooltip>
+  );
+}
+
+export default TooltipOperation;
diff --git a/rsconcept/frontend/src/components/select/PickSchema.tsx b/rsconcept/frontend/src/components/select/PickSchema.tsx
index 24b2e521..f1d267fb 100644
--- a/rsconcept/frontend/src/components/select/PickSchema.tsx
+++ b/rsconcept/frontend/src/components/select/PickSchema.tsx
@@ -16,12 +16,13 @@ interface PickSchemaProps {
   rows?: number;
 
   value?: LibraryItemID;
+  baseFilter?: (target: ILibraryItem) => boolean;
   onSelectValue: (newValue: LibraryItemID) => void;
 }
 
 const columnHelper = createColumnHelper<ILibraryItem>();
 
-function PickSchema({ id, initialFilter = '', rows = 4, value, onSelectValue }: PickSchemaProps) {
+function PickSchema({ id, initialFilter = '', rows = 4, value, onSelectValue, baseFilter }: PickSchemaProps) {
   const intl = useIntl();
   const { colors } = useConceptOptions();
 
@@ -38,8 +39,13 @@ function PickSchema({ id, initialFilter = '', rows = 4, value, onSelectValue }:
   }, [filterText]);
 
   useLayoutEffect(() => {
-    setItems(library.applyFilter(filter));
-  }, [library, filter, filter.query]);
+    const filtered = library.applyFilter(filter);
+    if (baseFilter) {
+      setItems(filtered.filter(baseFilter));
+    } else {
+      setItems(filtered);
+    }
+  }, [library, filter, filter.query, baseFilter]);
 
   const columns = useMemo(
     () => [
diff --git a/rsconcept/frontend/src/dialogs/DlgCreateOperation/DlgCreateOperation.tsx b/rsconcept/frontend/src/dialogs/DlgCreateOperation/DlgCreateOperation.tsx
index 6ccbfa19..0c889e95 100644
--- a/rsconcept/frontend/src/dialogs/DlgCreateOperation/DlgCreateOperation.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgCreateOperation/DlgCreateOperation.tsx
@@ -77,6 +77,7 @@ function DlgCreateOperation({ hideWindow, oss, insertPosition, positions, onCrea
     () => (
       <TabPanel>
         <TabInputOperation
+          oss={oss}
           alias={alias}
           setAlias={setAlias}
           comment={comment}
@@ -90,7 +91,7 @@ function DlgCreateOperation({ hideWindow, oss, insertPosition, positions, onCrea
         />
       </TabPanel>
     ),
-    [alias, comment, title, attachedID, syncText]
+    [alias, comment, title, attachedID, syncText, oss]
   );
 
   const synthesisPanel = useMemo(
diff --git a/rsconcept/frontend/src/dialogs/DlgCreateOperation/TabInputOperation.tsx b/rsconcept/frontend/src/dialogs/DlgCreateOperation/TabInputOperation.tsx
index 75ab2071..4a3dbfe3 100644
--- a/rsconcept/frontend/src/dialogs/DlgCreateOperation/TabInputOperation.tsx
+++ b/rsconcept/frontend/src/dialogs/DlgCreateOperation/TabInputOperation.tsx
@@ -1,3 +1,7 @@
+'use client';
+
+import { useCallback } from 'react';
+
 import { IconReset } from '@/components/Icons';
 import PickSchema from '@/components/select/PickSchema';
 import Checkbox from '@/components/ui/Checkbox';
@@ -7,10 +11,12 @@ import MiniButton from '@/components/ui/MiniButton';
 import TextArea from '@/components/ui/TextArea';
 import TextInput from '@/components/ui/TextInput';
 import AnimateFade from '@/components/wrap/AnimateFade';
-import { LibraryItemID } from '@/models/library';
+import { ILibraryItem, LibraryItemID } from '@/models/library';
+import { IOperationSchema } from '@/models/oss';
 import { limits, patterns } from '@/utils/constants';
 
 interface TabInputOperationProps {
+  oss: IOperationSchema;
   alias: string;
   setAlias: React.Dispatch<React.SetStateAction<string>>;
   title: string;
@@ -24,6 +30,7 @@ interface TabInputOperationProps {
 }
 
 function TabInputOperation({
+  oss,
   alias,
   setAlias,
   title,
@@ -35,6 +42,8 @@ function TabInputOperation({
   syncText,
   setSyncText
 }: TabInputOperationProps) {
+  const baseFilter = useCallback((item: ILibraryItem) => !oss.schemas.includes(item.id), [oss]);
+
   return (
     <AnimateFade className='cc-column'>
       <TextInput
@@ -87,7 +96,12 @@ function TabInputOperation({
         />
       </div>
 
-      <PickSchema value={attachedID} onSelectValue={setAttachedID} rows={8} />
+      <PickSchema
+        value={attachedID} // prettier: split-line
+        onSelectValue={setAttachedID}
+        rows={8}
+        baseFilter={baseFilter}
+      />
     </AnimateFade>
   );
 }
diff --git a/rsconcept/frontend/src/models/OssLoader.ts b/rsconcept/frontend/src/models/OssLoader.ts
index bf0f8ed2..f6107dde 100644
--- a/rsconcept/frontend/src/models/OssLoader.ts
+++ b/rsconcept/frontend/src/models/OssLoader.ts
@@ -3,7 +3,15 @@
  */
 
 import { Graph } from './Graph';
-import { IOperation, IOperationSchema, IOperationSchemaData, OperationID } from './oss';
+import { LibraryItemID } from './library';
+import {
+  IOperation,
+  IOperationSchema,
+  IOperationSchemaData,
+  IOperationSchemaStats,
+  OperationID,
+  OperationType
+} from './oss';
 
 /**
  * Loads data into an {@link IOperationSchema} based on {@link IOperationSchemaData}.
@@ -13,6 +21,7 @@ export class OssLoader {
   private oss: IOperationSchemaData;
   private graph: Graph = new Graph();
   private operationByID: Map<OperationID, IOperation> = new Map();
+  private schemas: LibraryItemID[] = [];
 
   constructor(input: IOperationSchemaData) {
     this.oss = input;
@@ -22,9 +31,12 @@ export class OssLoader {
     const result = this.oss as IOperationSchema;
     this.prepareLookups();
     this.createGraph();
+    this.extractSchemas();
 
     result.operationByID = this.operationByID;
     result.graph = this.graph;
+    result.schemas = this.schemas;
+    result.stats = this.calculateStats();
     return result;
   }
 
@@ -38,4 +50,18 @@ export class OssLoader {
   private createGraph() {
     this.oss.arguments.forEach(argument => this.graph.addEdge(argument.argument, argument.operation));
   }
+
+  private extractSchemas() {
+    this.schemas = this.oss.items.map(operation => operation.result as LibraryItemID).filter(item => item !== null);
+  }
+
+  private calculateStats(): IOperationSchemaStats {
+    const items = this.oss.items;
+    return {
+      count_operations: items.length,
+      count_inputs: items.filter(item => item.operation_type === OperationType.INPUT).length,
+      count_synthesis: items.filter(item => item.operation_type === OperationType.SYNTHESIS).length,
+      count_schemas: this.schemas.length
+    };
+  }
 }
diff --git a/rsconcept/frontend/src/models/oss.ts b/rsconcept/frontend/src/models/oss.ts
index b4dadb6c..9508a4e4 100644
--- a/rsconcept/frontend/src/models/oss.ts
+++ b/rsconcept/frontend/src/models/oss.ts
@@ -102,6 +102,16 @@ export interface ICstSubstituteEx extends ICstSubstitute {
   substitution_term: string;
 }
 
+/**
+ * Represents {@link IOperationSchema} statistics.
+ */
+export interface IOperationSchemaStats {
+  count_operations: number;
+  count_inputs: number;
+  count_synthesis: number;
+  count_schemas: number;
+}
+
 /**
  * Represents backend data for {@link IOperationSchema}.
  */
@@ -116,6 +126,8 @@ export interface IOperationSchemaData extends ILibraryItemData {
  */
 export interface IOperationSchema extends IOperationSchemaData {
   graph: Graph;
+  schemas: LibraryItemID[];
+  stats: IOperationSchemaStats;
   operationByID: Map<OperationID, IOperation>;
 }
 
diff --git a/rsconcept/frontend/src/pages/OssPage/EditorOssCard/EditorOssCard.tsx b/rsconcept/frontend/src/pages/OssPage/EditorOssCard/EditorOssCard.tsx
index 1df15a76..c4e0f01b 100644
--- a/rsconcept/frontend/src/pages/OssPage/EditorOssCard/EditorOssCard.tsx
+++ b/rsconcept/frontend/src/pages/OssPage/EditorOssCard/EditorOssCard.tsx
@@ -12,6 +12,7 @@ import { globals } from '@/utils/constants';
 
 import { useOssEdit } from '../OssEditContext';
 import FormOSS from './FormOSS';
+import OssStats from './OssStats';
 
 interface EditorOssCardProps {
   isModified: boolean;
@@ -50,11 +51,13 @@ function EditorOssCard({ isModified, onDestroy, setIsModified }: EditorOssCardPr
         onDestroy={onDestroy}
         controller={controller}
       />
-      <AnimateFade onKeyDown={handleInput} className={clsx('sm:w-fit mx-auto', 'flex flex-col sm:flex-row')}>
+      <AnimateFade onKeyDown={handleInput} className={clsx('sm:w-fit mx-auto', 'flex flex-col sm:flex-row px-6')}>
         <FlexColumn className='px-3'>
           <FormOSS id={globals.library_item_editor} isModified={isModified} setIsModified={setIsModified} />
           <EditorLibraryItem item={schema} isModified={isModified} controller={controller} />
         </FlexColumn>
+
+        <OssStats stats={schema?.stats} />
       </AnimateFade>
     </>
   );
diff --git a/rsconcept/frontend/src/pages/OssPage/EditorOssCard/OssStats.tsx b/rsconcept/frontend/src/pages/OssPage/EditorOssCard/OssStats.tsx
new file mode 100644
index 00000000..ab2ed4a9
--- /dev/null
+++ b/rsconcept/frontend/src/pages/OssPage/EditorOssCard/OssStats.tsx
@@ -0,0 +1,28 @@
+import Divider from '@/components/ui/Divider';
+import LabeledValue from '@/components/ui/LabeledValue';
+import { IOperationSchemaStats } from '@/models/oss';
+
+interface OssStatsProps {
+  stats?: IOperationSchemaStats;
+}
+
+function OssStats({ stats }: OssStatsProps) {
+  if (!stats) {
+    return null;
+  }
+  return (
+    <div className='flex flex-col sm:gap-1 sm:ml-6 sm:mt-8 sm:w-[16rem]'>
+      <Divider margins='my-2' className='sm:hidden' />
+
+      <LabeledValue id='count_all' label='Всего операций' text={stats.count_operations} />
+      <LabeledValue id='count_inputs' label='Загрузка' text={stats.count_inputs} />
+      <LabeledValue id='count_synthesis' label='Синтез' text={stats.count_synthesis} />
+
+      <Divider margins='my-2' />
+
+      <LabeledValue id='count_schemas' label='Прикрепленные схемы' text={stats.count_schemas} />
+    </div>
+  );
+}
+
+export default OssStats;
diff --git a/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/InputNode.tsx b/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/InputNode.tsx
index 4ed211b8..17f5ee4f 100644
--- a/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/InputNode.tsx
+++ b/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/InputNode.tsx
@@ -1,9 +1,11 @@
 import { Handle, Position } from 'reactflow';
 
 import { IconRSForm } from '@/components/Icons';
+import TooltipOperation from '@/components/info/TooltipOperation';
 import MiniButton from '@/components/ui/MiniButton.tsx';
 import Overlay from '@/components/ui/Overlay';
-import { useOSS } from '@/context/OssContext';
+import { IOperation } from '@/models/oss';
+import { prefixes } from '@/utils/constants';
 
 import { useOssEdit } from '../OssEditContext';
 
@@ -11,14 +13,14 @@ interface InputNodeProps {
   id: string;
   data: {
     label: string;
+    operation: IOperation;
   };
 }
 
 function InputNode({ id, data }: InputNodeProps) {
   const controller = useOssEdit();
-  const model = useOSS();
 
-  const hasFile = !!model.schema?.operationByID.get(Number(id))?.result;
+  const hasFile = !!data.operation.result;
 
   const handleOpenSchema = () => {
     controller.openOperationSchema(Number(id));
@@ -39,7 +41,12 @@ function InputNode({ id, data }: InputNodeProps) {
           disabled={!hasFile}
         />
       </Overlay>
-      <div className='flex-grow text-center text-sm'>{data.label}</div>
+      <div id={`${prefixes.operation_list}${id}`} className='flex-grow text-center text-sm'>
+        {data.label}
+        {controller.showTooltip ? (
+          <TooltipOperation anchor={`#${prefixes.operation_list}${id}`} data={data.operation} />
+        ) : null}
+      </div>
     </>
   );
 }
diff --git a/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OperationNode.tsx b/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OperationNode.tsx
index a4ada7e6..72e33aa9 100644
--- a/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OperationNode.tsx
+++ b/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OperationNode.tsx
@@ -1,23 +1,25 @@
 import { Handle, Position } from 'reactflow';
 
 import { IconRSForm } from '@/components/Icons';
+import TooltipOperation from '@/components/info/TooltipOperation';
 import MiniButton from '@/components/ui/MiniButton.tsx';
 import Overlay from '@/components/ui/Overlay';
-import { useOSS } from '@/context/OssContext';
+import { IOperation } from '@/models/oss';
+import { prefixes } from '@/utils/constants';
 
 import { useOssEdit } from '../OssEditContext';
 interface OperationNodeProps {
   id: string;
   data: {
     label: string;
+    operation: IOperation;
   };
 }
 
 function OperationNode({ id, data }: OperationNodeProps) {
   const controller = useOssEdit();
-  const model = useOSS();
 
-  const hasFile = !!model.schema?.operationByID.get(Number(id))?.result;
+  const hasFile = !!data.operation.result;
 
   const handleOpenSchema = () => {
     controller.openOperationSchema(Number(id));
@@ -38,7 +40,11 @@ function OperationNode({ id, data }: OperationNodeProps) {
           disabled={!hasFile}
         />
       </Overlay>
-      <div className='flex-grow text-center text-sm'>{data.label}</div>
+
+      <div id={`${prefixes.operation_list}${id}`} className='flex-grow text-center text-sm'>
+        {data.label}
+        <TooltipOperation anchor={`#${prefixes.operation_list}${id}`} data={data.operation} />
+      </div>
 
       <Handle type='target' position={Position.Top} id='left' style={{ left: 40 }} />
       <Handle type='target' position={Position.Top} id='right' style={{ right: 40, left: 'auto' }} />
diff --git a/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OssFlow.tsx b/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OssFlow.tsx
index 45364ec2..25be92cf 100644
--- a/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OssFlow.tsx
+++ b/rsconcept/frontend/src/pages/OssPage/EditorOssGraph/OssFlow.tsx
@@ -50,7 +50,6 @@ function OssFlow({ isModified, setIsModified, showGrid, setShowGrid }: OssFlowPr
   const onSelectionChange = useCallback(
     ({ nodes }: { nodes: Node[] }) => {
       controller.setSelected(nodes.map(node => Number(node.id)));
-      console.log(nodes);
     },
     [controller]
   );
@@ -67,7 +66,7 @@ function OssFlow({ isModified, setIsModified, showGrid, setShowGrid }: OssFlowPr
       setNodes(
         model.schema.items.map(operation => ({
           id: String(operation.id),
-          data: { label: operation.alias },
+          data: { label: operation.alias, operation: operation },
           position: { x: operation.position_x, y: operation.position_y },
           type: operation.operation_type.toString()
         }))
@@ -116,7 +115,6 @@ function OssFlow({ isModified, setIsModified, showGrid, setShowGrid }: OssFlowPr
 
   const handleCreateOperation = useCallback(() => {
     const center = flow.project({ x: window.innerWidth / 2, y: window.innerHeight / 2 });
-    console.log(center);
     controller.promptCreateOperation(center.x, center.y, getPositions());
   }, [controller, getPositions, flow]);
 
@@ -168,8 +166,17 @@ function OssFlow({ isModified, setIsModified, showGrid, setShowGrid }: OssFlowPr
       });
   }, [colors, nodes]);
 
+  const handleContextMenu = useCallback(
+    (event: React.MouseEvent<HTMLDivElement, MouseEvent>) => {
+      event.preventDefault();
+      event.stopPropagation();
+      controller.setShowTooltip(prev => !prev);
+      // setShowContextMenu(true);
+    },
+    [controller]
+  );
+
   function handleKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
-    // Hotkeys implementation
     if (controller.isProcessing) {
       return;
     }
@@ -217,11 +224,12 @@ function OssFlow({ isModified, setIsModified, showGrid, setShowGrid }: OssFlowPr
         nodesConnectable={false}
         snapToGrid={true}
         snapGrid={[10, 10]}
+        onContextMenu={handleContextMenu}
       >
         {showGrid ? <Background gap={10} /> : null}
       </ReactFlow>
     ),
-    [nodes, edges, proOptions, handleNodesChange, onEdgesChange, OssNodeTypes, showGrid]
+    [nodes, edges, proOptions, handleNodesChange, handleContextMenu, onEdgesChange, OssNodeTypes, showGrid]
   );
 
   return (
diff --git a/rsconcept/frontend/src/pages/OssPage/OssEditContext.tsx b/rsconcept/frontend/src/pages/OssPage/OssEditContext.tsx
index a7ab337f..c78e9732 100644
--- a/rsconcept/frontend/src/pages/OssPage/OssEditContext.tsx
+++ b/rsconcept/frontend/src/pages/OssPage/OssEditContext.tsx
@@ -26,6 +26,9 @@ export interface IOssEditContext {
   isMutable: boolean;
   isProcessing: boolean;
 
+  showTooltip: boolean;
+  setShowTooltip: React.Dispatch<React.SetStateAction<boolean>>;
+
   setOwner: (newOwner: UserID) => void;
   setAccessPolicy: (newPolicy: AccessPolicy) => void;
   promptEditors: () => void;
@@ -71,6 +74,8 @@ export const OssEditState = ({ selected, setSelected, children }: OssEditStatePr
     [accessLevel, model.schema?.read_only]
   );
 
+  const [showTooltip, setShowTooltip] = useState(true);
+
   const [showEditEditors, setShowEditEditors] = useState(false);
   const [showEditLocation, setShowEditLocation] = useState(false);
 
@@ -211,6 +216,9 @@ export const OssEditState = ({ selected, setSelected, children }: OssEditStatePr
         schema: model.schema,
         selected,
 
+        showTooltip,
+        setShowTooltip,
+
         isMutable,
         isProcessing: model.processing,
 
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/EditorTermGraph.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/EditorTermGraph.tsx
index 1cc7a8f4..f4e156d0 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/EditorTermGraph.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorTermGraph/EditorTermGraph.tsx
@@ -180,7 +180,6 @@ function EditorTermGraph({ onOpenEdit }: EditorTermGraphProps) {
   }, [graphRef]);
 
   function handleKeyDown(event: React.KeyboardEvent<HTMLDivElement>) {
-    // Hotkeys implementation
     if (controller.isProcessing) {
       return;
     }
diff --git a/rsconcept/frontend/src/utils/constants.ts b/rsconcept/frontend/src/utils/constants.ts
index 99956730..a92bb373 100644
--- a/rsconcept/frontend/src/utils/constants.ts
+++ b/rsconcept/frontend/src/utils/constants.ts
@@ -148,6 +148,7 @@ export const prefixes = {
   cst_source_list: 'cst_source_list_',
   cst_delete_list: 'cst_delete_list_',
   cst_dependant_list: 'cst_dependant_list_',
+  operation_list: 'operation_list_',
   csttype_list: 'csttype_',
   policy_list: 'policy_list_',
   library_filters_list: 'library_filters_list_',