diff --git a/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingCodeEditorIntegration.ts b/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingCodeEditorIntegration.ts
index 72074bcfcc6e5..d01bb1368ae89 100644
--- a/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingCodeEditorIntegration.ts
+++ b/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingCodeEditorIntegration.ts
@@ -851,6 +851,13 @@ class DiffHunkWidget implements IOverlayWidget, IModifiedFileEntryChangeHunk {
 		}
 		return this._diffInfo.keep(this._change);
 	}
+
+	getModifiedLineRange(): { startLineNumber: number; endLineNumberExclusive: number } | undefined {
+		return {
+			startLineNumber: this._change.modified.startLineNumber,
+			endLineNumberExclusive: this._change.modified.endLineNumberExclusive
+		};
+	}
 }
 
 
diff --git a/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingEditorActions.ts b/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingEditorActions.ts
index addad07920773..b5a801d031944 100644
--- a/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingEditorActions.ts
+++ b/src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingEditorActions.ts
@@ -5,6 +5,7 @@
 import { Codicon } from '../../../../../base/common/codicons.js';
 import { KeyCode, KeyMod } from '../../../../../base/common/keyCodes.js';
 import { ServicesAccessor } from '../../../../../editor/browser/editorExtensions.js';
+import { Range } from '../../../../../editor/common/core/range.js';
 import { EditorContextKeys } from '../../../../../editor/common/editorContextKeys.js';
 import { localize, localize2 } from '../../../../../nls.js';
 import { Action2, IAction2Options, MenuId, MenuRegistry, registerAction2 } from '../../../../../platform/actions/common/actions.js';
@@ -22,6 +23,7 @@ import { NOTEBOOK_CELL_LIST_FOCUSED, NOTEBOOK_EDITOR_FOCUSED } from '../../../no
 import { ChatContextKeys } from '../../common/actions/chatContextKeys.js';
 import { CHAT_EDITING_MULTI_DIFF_SOURCE_RESOLVER_SCHEME, IChatEditingService, IChatEditingSession, IModifiedFileEntry, IModifiedFileEntryChangeHunk, IModifiedFileEntryEditorIntegration, ModifiedFileEntryState, parseChatMultiDiffUri } from '../../common/editing/chatEditingService.js';
 import { CHAT_CATEGORY } from '../actions/chatActions.js';
+import { IChatWidgetService } from '../chat.js';
 import { ctxCursorInChangeRange, ctxHasEditorModification, ctxIsCurrentlyBeingModified, ctxIsGlobalEditingSession, ctxReviewModeEnabled } from './chatEditingEditorContextKeys.js';
 
 
@@ -319,6 +321,40 @@ class ToggleDiffAction extends ChatEditingEditorAction {
 	}
 }
 
+class AddHunkToChatAction extends ChatEditingEditorAction {
+	constructor() {
+		super({
+			id: 'chatEditor.action.addHunkToChat',
+			title: localize2('addHunkToChat', 'Add to Chat'),
+			icon: Codicon.attach,
+			precondition: ContextKeyExpr.and(ChatContextKeys.enabled, ctxHasEditorModification, ctxIsCurrentlyBeingModified.negate()),
+			menu: {
+				id: MenuId.ChatEditingEditorHunk,
+				order: 20
+			}
+		});
+	}
+
+	override async runChatEditingCommand(accessor: ServicesAccessor, _session: IChatEditingSession, entry: IModifiedFileEntry, _integration: IModifiedFileEntryEditorIntegration, ...args: unknown[]): Promise<void> {
+		const chatWidgetService = accessor.get(IChatWidgetService);
+
+		const hunk = args[0] as IModifiedFileEntryChangeHunk | undefined;
+		const lineRange = hunk?.getModifiedLineRange();
+		if (!lineRange) {
+			return;
+		}
+
+		const widget = chatWidgetService.lastFocusedWidget ?? await chatWidgetService.revealWidget();
+		if (!widget) {
+			return;
+		}
+
+		const range = new Range(lineRange.startLineNumber, 1, lineRange.endLineNumberExclusive, 1);
+		widget.attachmentModel.addFile(entry.modifiedURI, range);
+		widget.focusInput();
+	}
+}
+
 class ToggleAccessibleDiffViewAction extends ChatEditingEditorAction {
 	constructor() {
 		super({
@@ -447,6 +483,7 @@ export function registerChatEditorActions() {
 	registerAction2(AcceptHunkAction);
 	registerAction2(RejectHunkAction);
 	registerAction2(ToggleDiffAction);
+	registerAction2(AddHunkToChatAction);
 	registerAction2(ToggleAccessibleDiffViewAction);
 
 	registerAction2(class extends MultiDiffAcceptDiscardAction { constructor() { super(true); } });
diff --git a/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/chatEditingNotebookEditorIntegration.ts b/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/chatEditingNotebookEditorIntegration.ts
index 2eaea73e41585..33edc5980ff23 100644
--- a/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/chatEditingNotebookEditorIntegration.ts
+++ b/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/chatEditingNotebookEditorIntegration.ts
@@ -371,6 +371,9 @@ class ChatEditingNotebookEditorWidgetIntegration extends Disposable implements I
 						accessibilitySignalService.playSignal(AccessibilitySignal.editsUndone, { allowManyInParallel: true });
 						return Promise.resolve(true);
 					},
+					getModifiedLineRange() {
+						return undefined; // Not applicable for notebook cell deletions
+					},
 				} satisfies IModifiedFileEntryChangeHunk;
 			}
 		}));
diff --git a/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/overlayToolbarDecorator.ts b/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/overlayToolbarDecorator.ts
index a684d819a8842..4fb6a72d5a01d 100644
--- a/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/overlayToolbarDecorator.ts
+++ b/src/vs/workbench/contrib/chat/browser/chatEditing/notebook/overlayToolbarDecorator.ts
@@ -118,6 +118,9 @@ export class OverlayToolbarDecorator extends Disposable {
 								await change.undo(singleChange);
 							}
 							return true;
+						},
+						getModifiedLineRange() {
+							return undefined; // Not applicable for notebook cell overlays
 						}
 					} satisfies IModifiedFileEntryChangeHunk,
 				},
diff --git a/src/vs/workbench/contrib/chat/common/editing/chatEditingService.ts b/src/vs/workbench/contrib/chat/common/editing/chatEditingService.ts
index c5db2d082329d..b667a41641248 100644
--- a/src/vs/workbench/contrib/chat/common/editing/chatEditingService.ts
+++ b/src/vs/workbench/contrib/chat/common/editing/chatEditingService.ts
@@ -316,6 +316,10 @@ export const enum ModifiedFileEntryState {
 export interface IModifiedFileEntryChangeHunk {
 	accept(): Promise<boolean>;
 	reject(): Promise<boolean>;
+	/**
+	 * Get the modified line range of this hunk
+	 */
+	getModifiedLineRange(): { startLineNumber: number; endLineNumberExclusive: number } | undefined;
 }
 
 export interface IModifiedFileEntryEditorIntegration extends IDisposable {