diff --git a/package.json b/package.json
index 6bcdf89..74d5ee4 100644
--- a/package.json
+++ b/package.json
@@ -60,6 +60,11 @@
         "title": "Open Claude Code Chat",
         "category": "Claude Code Chat",
         "icon": "icon-bubble.png"
+      },
+      {
+        "command": "claude-code-chat.showPlan",
+        "title": "Show Plan Files",
+        "category": "Claude Code Chat"
       }
     ],
     "keybindings": [
@@ -73,6 +78,9 @@
       "commandPalette": [
         {
           "command": "claude-code-chat.openChat"
+        },
+        {
+          "command": "claude-code-chat.showPlan"
         }
       ],
       "editor/context": [
diff --git a/src/extension.ts b/src/extension.ts
index 8fa37fb..5fd8d38 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -44,6 +44,15 @@ export function activate(context: vscode.ExtensionContext) {
 		provider.loadConversation(filename);
 	});
 
+	const showPlanDisposable = vscode.commands.registerCommand('claude-code-chat.showPlan', () => {
+		provider.showPlanFiles();
+	});
+
+	// Offer to notify Claude when a plan file (~/.claude/plans/*.md) is saved from the editor
+	const planFileSaveDisposable = vscode.workspace.onDidSaveTextDocument(document => {
+		provider.handlePlanFileSaved(document);
+	});
+
 	// Register webview view provider for sidebar chat (using shared provider instance)
 	const webviewProvider = new ClaudeChatWebviewProvider(context.extensionUri, provider);
 	vscode.window.registerWebviewViewProvider('claude-code-chat.chat', webviewProvider);
@@ -98,7 +107,7 @@ export function activate(context: vscode.ExtensionContext) {
 		}
 	});
 
-	context.subscriptions.push(disposable, loadConversationDisposable, configChangeDisposable, statusBarItem, uriHandler);
+	context.subscriptions.push(disposable, loadConversationDisposable, showPlanDisposable, planFileSaveDisposable, configChangeDisposable, statusBarItem, uriHandler);
 }
 
 export function deactivate() {
@@ -595,6 +604,9 @@ class ClaudeChatProvider {
 			case 'openFile':
 				this._openFileInEditor(message.filePath);
 				return;
+			case 'showPlanFiles':
+				this.showPlanFiles();
+				return;
 			case 'openDiff':
 				this._openDiffEditor(message.oldContent, message.newContent, message.filePath);
 				return;
@@ -3866,6 +3878,99 @@ class ClaudeChatProvider {
 		this._context.globalState.update('wslAlertDismissed', true);
 	}
 
+	// ─── Plan Files ───
+
+	private _getPlansDir(): string {
+		const homeDir = process.env.HOME || process.env.USERPROFILE || '';
+		return path.join(homeDir, '.claude', 'plans');
+	}
+
+	public async showPlanFiles(): Promise<void> {
+		const plansDir = this._getPlansDir();
+
+		let entries: [string, vscode.FileType][];
+		try {
+			entries = await vscode.workspace.fs.readDirectory(vscode.Uri.file(plansDir));
+		} catch {
+			vscode.window.showInformationMessage('No plan files found in ~/.claude/plans/');
+			return;
+		}
+
+		const mdFiles = entries.filter(([name, type]) => (type & vscode.FileType.File) !== 0 && name.toLowerCase().endsWith('.md'));
+		if (mdFiles.length === 0) {
+			vscode.window.showInformationMessage('No plan files found in ~/.claude/plans/');
+			return;
+		}
+
+		const plans: { name: string; filePath: string; mtime: number }[] = [];
+		for (const [name] of mdFiles) {
+			const filePath = path.join(plansDir, name);
+			try {
+				const stat = await vscode.workspace.fs.stat(vscode.Uri.file(filePath));
+				plans.push({ name, filePath, mtime: stat.mtime });
+			} catch { /* stat failed, skip */ }
+		}
+		plans.sort((a, b) => b.mtime - a.mtime);
+
+		if (plans.length === 0) {
+			vscode.window.showInformationMessage('No plan files found in ~/.claude/plans/');
+			return;
+		}
+
+		if (plans.length === 1) {
+			this._openFileInEditor(plans[0].filePath);
+			return;
+		}
+
+		const picked = await vscode.window.showQuickPick(
+			plans.map(plan => ({
+				label: plan.name.replace(/\.md$/i, ''),
+				description: new Date(plan.mtime).toLocaleString(),
+				filePath: plan.filePath
+			})),
+			{ placeHolder: 'Select a plan file to open' }
+		);
+
+		if (picked) {
+			this._openFileInEditor(picked.filePath);
+		}
+	}
+
+	public async handlePlanFileSaved(document: vscode.TextDocument): Promise<void> {
+		const savedPath = document.uri.fsPath;
+		if (!savedPath.toLowerCase().endsWith('.md')) {
+			return;
+		}
+
+		const plansDir = path.resolve(this._getPlansDir());
+		const resolvedSavedPath = path.resolve(savedPath);
+		const isWithinPlansDir = process.platform === 'win32'
+			? resolvedSavedPath.toLowerCase().startsWith(plansDir.toLowerCase() + path.sep)
+			: resolvedSavedPath.startsWith(plansDir + path.sep);
+
+		if (!isWithinPlansDir) {
+			return;
+		}
+
+		const fileName = path.basename(savedPath, '.md');
+		const hasActiveWebview = !!(this._panel || this._webview);
+
+		if (!hasActiveWebview) {
+			vscode.window.showInformationMessage(`Plan file "${fileName}" saved.`);
+			return;
+		}
+
+		const selection = await vscode.window.showInformationMessage(
+			`Plan file "${fileName}" saved. Tell Claude about your changes?`,
+			'Send to Claude',
+			'Dismiss'
+		);
+
+		if (selection === 'Send to Claude') {
+			this._sendMessageToClaude(`I updated the plan file "${fileName}" in ~/.claude/plans/. Please re-read it and adjust your approach accordingly.`);
+		}
+	}
+
 	private async _openFileInEditor(filePath: string) {
 		try {
 			const uri = vscode.Uri.file(filePath);
diff --git a/src/script.ts b/src/script.ts
index 4c949e2..5548860 100644
--- a/src/script.ts
+++ b/src/script.ts
@@ -4319,6 +4319,12 @@ const getScript = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'htt
 			});
 		}
 
+		function showPlanFiles() {
+			vscode.postMessage({
+				type: 'showPlanFiles'
+			});
+		}
+
 		function restoreToCommit(commitSha) {
 			vscode.postMessage({
 				type: 'restoreCommit',
diff --git a/src/ui.ts b/src/ui.ts
index 4ffcab7..93995b1 100644
--- a/src/ui.ts
+++ b/src/ui.ts
@@ -31,6 +31,7 @@ const getHtml = (isTelemetryEnabled: boolean, opencreditsApiUrl: string = 'https
 			<div id="sessionStatus" class="session-status" style="display: none;">No session</div>
 			<button class="btn outlined" id="settingsBtn" onclick="toggleSettings()" title="Settings">⚙️</button>
 			<button class="btn outlined" id="historyBtn" onclick="toggleConversationHistory()">📚 History</button>
+			<button class="btn outlined" id="plansBtn" onclick="showPlanFiles()" title="Open a plan file (~/.claude/plans)">📋 Plans</button>
 			<button class="btn primary" id="newSessionBtn" onclick="newSession()">New Chat</button>
 		</div>
 	</div>